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  1. Indoor radon; Le radon dans les batiments

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1997-12-01

    The radon, a natural radioactive gas, is present almost everywhere on the earth's surface. It can be accumulated at high concentration in confined spaces (buildings, mines, etc). In the last decades many studies conducted in several countries showed that inhaling important amounts of radon rises the risk of lung cancer. Although, the radon is a naturally appearing radioactive source, it may be the subject of a human 'enhancement' of concentration. The increasing radon concentration in professional housing constitutes an example of enhanced natural radioactivity which can induce health risks on workers and public. Besides, the radon is present in the dwelling houses (the domestic radon). On 13 May 1996, the European Union Council issued the new EURATOM Instruction that establishes the basic standards of health protection of population and workers against the ionizing radiation hazards (Instruction 96/29/EURATOM, JOCE L-159 of 29 June 1996). This instruction does not apply to domestic radon but it is taken into consideration by another EURATOM document: the recommendation of the Commission 90/143/EURATOM of 21 February 1990 (JOCE L-80 of 27 March 1990). The present paper aims at establishing in accordance to European Union provisions the guidelines for radon risk management in working places, as well as in dwelling houses, where the implied risk is taken into account. This document does not deal with cases of high radon concentration on sites where fabrication, handling or storage of radium sources take place. These situations must be treated by special studies.

  2. Decree of the 7. august 2008 relative to the risk management in relation with radon in workplaces; Arrete du 7 aout 2008 relatif a la gestion du risque lie au radon dans les lieux de travail

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2008-07-01

    This order clarifies measures to be taken in the companies where the level of radon activities involve the health of the personnel: measurements to make regularly, measures to reduce the levels of activity, to assure the dosimetry follow-up, to verify the conditions of work places, the installations of ventilation. (N.C.)

  3. Analyses of atmospheric radon 222 / canisters exposed by Greenpeace in Niger (Arlit / Akokan sector); Analyses du radon 222 dans l'air ambiant / Capteurs exposes par Greenpeace au Niger (secteur Arlit et Akokan)

    Energy Technology Data Exchange (ETDEWEB)

    Chareyron, B.

    2010-07-01

    The companies SOMAIR and COMINAK, subsidiaries of the AREVA group, are mining uranium deposits in northern Niger. In the course of a field mission carried out in November 2009, a Greenpeace International team deposited detectors (canisters of activated charcoal) to measure radon 222, a radioactive gas formed by the decay of the radium 226 present in the uranium ore. This report includes the results of the analysis of the activated charcoal canisters conducted in CRIIRAD's laboratory, and a brief commentary on the interpretation of the results. (authors)

  4. The problem of radon in uranium mines; Le probleme du radon dans les mines d'uranium

    Energy Technology Data Exchange (ETDEWEB)

    Jammet, H.; Pradel, J. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1955-07-01

    The exploitation of uranium ores constitute the first stage in the use of the atomic energy. With the current methods of exploitation, we meet in these mines various dangers of irradiation and contamination which the presence of the radon constitutes one of the most important aspects. The supportable maximum concentration is currently of 10{sup -10} c of radon by liter of air. It seems, even while considering that the RaA, RaB and RaC descendants are not in balance, that it cannot be fix a less rigorous limit. Indeed the limit proposed by the ''Commission Internationale de Protection Radiologique'' give, for an exhibition of 40 hours per week a dose calculated to the level of the bronchi of: 9,5 rem/week with 100% of RaA and 50% of RaB and RaCs, or 19 rem/week with 100% of RaA, RaB and RaC instead of 0,3 rem. It is necessary, also, to take into account because of the risk is not unique for the miner who is expose to the radiation of ore and breath dusts of uranium. (authors) [French] L'exploitation des minerais d'uranium constitue le premier stade dans l'utilisation de l'energie atomique. Avec les methodes courantes d'exploitation on rencontre dans ces mines des dangers divers d'irradiation et de contamination dont la presence du radon constitue l'un des aspects les plus importants. La concentration maximum tolerable est actuellement de 10{sup -10} c de radon par litre d'air. Il semble, meme en considerant que les descendants RaA, RaB et RaC ne sont pas en equilibre, qu'on ne puisse pas fixer une limite moins rigoureuse. En effet la limite proposee par la Commission Internationale de Protection radiologique donne, pour une exposition de 40 heures par semaine une dose calculee au niveau des bronches de: 9,5 rem/semaine avec 100 % de RaA et 50 % de RaB et RaC, ou 19 rem/semaine avec 100 % de RaA, RaB et RaC au lieu de 0,3 rem. Il faut, en outre, tenir compte du fait que le risque n'est pas unique

  5. Radon - The management of the risk related to radon; Le radon la gestion du risque lie au radon

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2010-07-01

    This leaflet briefly explains what radon is, where it comes from, and what it becomes. It indicates and briefly comments its concentrations in French departments, describes how radon can affect our health (lung cancer), describes how the risk can be reduced in buildings, and indicates the existing regulatory provisions

  6. SUPRESI MULTIPEL PADA DATA SEISMIK LAUT DENGAN METODE DEKONVOLUSI PREDIKTIF DAN RADON DEMULTIPEL

    Directory of Open Access Journals (Sweden)

    Arifudin Arifudin

    2017-01-01

    Full Text Available Abstrak. Pengolahan data seismik merupakan suatu pekerjaan untuk menekan noise dan memperkuat sinyal dari hasil rekaman data lapangan. Supresi multipel dengan metode radon demultipeldan dekonvolusi prediktif adalah salah satu teknik yang biasa digunakan dalam penekanan energi multipel pada data seismik. Prinsip kerjanya adalah dengan memisahkan sinyal dan multipel dalam domain radon dengan memanfaatkan nilai perbedaan moveout antara sinyal primer dan multipel pada metode radon sedangkan pada dekonvolusi prediktif yaitu dengan cara mencari bagian-bagian yang bisa diprediksi dari trace seismik. Metode ini diaplikasikan pada data seismik laut 2D. Studi ini bertujuan untuk mengetahui respon dari metode dekonvolusi prediktif dan radon demultipel dalam mengatenuasi multipel pada pengolahan data seismik dan memperbaiki kualitas data rekaman sehingga menghasilkan penampang seismik yang bebas dari noise. Hasil yang diperoleh dari analisa metode dekonvolusi prediktif dan radon demultipelprediktif, data yang diperkirakan sebagai reflektor primer menjadi lebih menerus sedangkan untuk radon demultipel rasio sinyal terhadap gangguan data keluaran lebih besar dari pada data masukan, hal ini karena nilai multipel pada data seismik berkurang.   Kata kunci: supresi multipel, radondemultipel, dekonvolusi prediktif

  7. Adaptation dans les zones cruciales au regard des changements ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    ) vise à accroître la résilience des populations pauvres dans trois « zones cruciales » au regard des changements climatiques : les bassins hydrographiques, les deltas et les régions semi-arides.

  8. L'entrepreneuriat au Canada dans le contexte mondial | CRDI ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    13 mai 2016 ... Également selon le rapport, au Canada, les immigrants de première génération se lancent en affaires dans une proportion plus élevée que le reste de la population, et les femmes participent davantage à l'activité entrepreneuriale que dans les autres pays du G7. En outre, au Canada, contrairement à ce ...

  9. Concentration en radon dans une maison du Calvados

    Science.gov (United States)

    Leleyter, Lydia; Riffault, Benoit; Mazenc, Bernard

    2010-03-01

    Recent studies indicate a link between the risk of lung cancer and residential radon exposure. However, in France, awareness of this problem was made relatively late. Accordingly this study examines the radon concentration in a private home in Calvados. Findings show that the presence of a fireplace in a house can accelerate radon convective transfer, and that simple adjustments to interior and exterior accommodation can significantly reduce radon concentrations in the home.

  10. Radon

    Science.gov (United States)

    ... del radón Home Buyers and Sellers Radon Protection: Buying a Home Radon Protection: Building a Home Radon- ... Open Government Regulations.gov Subscribe USA.gov White House Ask. Contact Us Hotlines FOIA Requests Frequent Questions ...

  11. Radon in homes and risk of lung cancer: 13 collaborative analyses of individual data from European case-control studies;Exposition au radon dans les habitations et risque de cancer du poumon: analyse conjointe des donnees individuelles de 13 etudes cas-temoins europeennes

    Energy Technology Data Exchange (ETDEWEB)

    Darby, S.; Hill, D.; Doll, R. [Radcliffe Infirmary (United Kingdom); Auvinen, A. [Ecole de Sante Publique, Tampere (Finland); Barros Dios, J.M.; Ruano Ravina, A. [Santiago de Compostela Univ. (Spain); Baysson, H.; Tirmarche, M. [Institut de Radioprotection et de Surete Nucleaire, 92 - Fontenay aux Roses (France); Bochicchio, F. [Institut National Italien de la Sante, Rome (Italy); Deo, H. [Reading Univ. (United Kingdom); Falk, R. [Autorite suedoise de Radioprotection, Stockholm (Sweden); Forastiere, F. [Departement d' Epidemiologie, Rome (Italy); Hakama, M. [Registre du cancer finlandais, Helsinki (Finland); Heid, I.; Schaffrath Rosario, A.; Wichmann, H.E. [Centre de recherche GSF pour l' Environnement et la Sante, Neuherberg (Germany); Kreienbrock, L. [Institut de Biometrie, d' Epidemiologie et de Traitement de l' Information, Hannovre (Germany); Kreuzer, M. [Departement de Radioprotection et de Sante, Neuherberg (Germany); Lagarde, F.; Pershagen, G. [Institut de Medecine Environnementale, Stockholm (Sweden); Makelainen, I.; Ruosteenoja, E. [Autorite de Surete Nucleaire et de Radioprotection, Helsinki (Finland); Muirhead, C. [Autorite Nationale de Radioprotection, Chilton (United Kingdom); Oberaigner, W. [Tumorregister Tirol, Innsbruck (Austria); TomaBek, L. [Institut National de Radioprotection, Prague, Republique Tcheque (Czech Republic); Whitley, E. [Bristol Univ. (United Kingdom)

    2007-05-15

    Objective: To determine the risk of lung cancer associated with exposure at home to the radioactive disintegration products of naturally occurring radon gas. Design: Collaborative analysis of individual data from 13 case-control studies of residential radon and lung cancer. Setting: Nine European countries. Subjects: 7148 cases of lung cancer and 14 208 controls. Main outcome measures: Relative risks of lung cancer and radon gas concentrations in homes inhabited during the previous 5-34 years measured in becquerels (radon disintegrations per second) per cubic metre (Bq/m3) of household air. Results: The mean measured radon concentration in homes of people in the control group was 97 Bq/m3, with 11% measuring > 200 and 4% measuring > 400 Bq/m3. For cases of lung cancer the mean concentration was 104 Bq/m3. The risk of lung cancer increased by 8.4% (95% confidence interval 3.0% to 15.8%) per 100 Bq/m3 increase in measured radon (P=0.0007). This corresponds to an increase of 16% (5% to 31%) per 100 Bq/m3 increase in usual radon- that is, after correction for the dilution caused by random uncertainties in measuring radon concentrations. The dose-response relation seemed to be linear with no threshold and remained significant (P = 0.04) in analyses limited to individuals from homes with measured radon < 200 Bq/m3. The proportionate excess risk did not differ significantly with study, age, sex, or smoking. In the absence of other causes of death, the absolute risks of lung cancer by age 75 years at usual radon concentrations of 0, 100, and 400 Bq/m3 would be about 0.4%, 0.5%, and 0.7%, respectively, for lifelong non-smokers, and about 25 times greater (10%, 12%, and 16%) for cigarette smokers. Conclusions: Collectively, though not separately, these studies show appreciable hazards from residential radon, particularly for smokers and recent ex-smokers, and indicate that it is responsible for about 2% of all deaths from cancer in Europe. (author)

  12. Adaptation au stress hydrique dans le Comahue, en Argentine ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Adaptation au stress hydrique dans le Comahue, en Argentine. On prévoit que les changements climatiques entraîneront une diminution des précipitations annuelles dans le Comahue, une région du centre-ouest de l'Argentine. Conjugué à la hausse prévue de la demande en eau et de l'utilisation de la ressource, ...

  13. Radon

    Science.gov (United States)

    ... radon-resistant features. These features include gravel and plastic sheeting below the foundation, along with proper sealing ... 4 in 10 Americans at Risk from Air Pollution News: American Lung Association Reacts to Proposed Volkswagen ...

  14. Radon

    International Nuclear Information System (INIS)

    Holmen, R.W.

    1987-01-01

    The discovery that radon enters into residential and commercial structures and produces adverse health consequences to occupants thereof has raised issues for the real estate profession in connection with transactions involving affected structures. The legal responsibilities of real estate professionals in relation to such structures have not yet been clearly defined. Moreover, consistent and reliable testing methods and results, clear identification of circumstances where testing is necessary, and consensus as to health risks suggested by various radon levels have yet to be achieved. When these legal and technical questions are clarified, real estate buyer and sellers as well as agents and brokers will be greatly benefited

  15. L'emploi dans le secteur non structuré au service de la croissance ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    L'emploi dans le secteur non structuré au service de la croissance partagée en Afrique de l'Est et en Afrique australe. Le fait de comprendre pourquoi les femmes font partie de micro et petites entreprises au Zimbabwe, en Tanzanie, en Ouganda et au Rwanda peut aider les gouvernements à définir des politiques visant à ...

  16. Produksi Biofuel dari Minyak Kelapa Sawit dengan Katalis Au/HZSM-5 dan Kompositnya

    Directory of Open Access Journals (Sweden)

    Tillotama Anindita Sari

    2012-09-01

    Full Text Available Semakin meningkatnya kebutuhan dan konsumsi bahan bakar minyak menyebabkan cadangan minyak bumi semakin menipis sehingga perlu adanya pengembangan bahan lain sebagai sumber bahan bakar alternatif yang dapat menggantikannya. Salah satu produk energi alternatif yang ramah lingkungan dan dapat diperbaharui adalah biofuel. Perubahan minyak sawit menjadi biofuel salah satunya adalah dengan proses perengkahan katalitik. Penelitian ini bertujuan untuk mengatasi masalah tersebut dimana dalam penelitian ini akan dipelajari kondisi operasi dan  unjuk kerja katalis Au/HZSM-5 sintetis dan kompositnya pada reaksi perengkahan minyak sawit menjadi biofuel. Penelitian ini diharapakan mampu menghasilkan teknologi pembuatan katalis baru dan teknologi proses baru dalam proses produksi biofuel pada proses perengkahan katalitik asam palmitat dari minyak sawit. Pada penelitian ini biofuel telah berhasil diperoleh pada proses perengkahan minyak sawit menggunakan katalis Au/HZSM-5 sintetis dan kompositnya pada berbagai temperatur dan laju alir gas N2. Penelitian dilakukan dengan tiga tahapan yaitu sintesa katalis, karakterisasi katalis dan proses perengkahan katalitik. Au/HZSM-5 disintesa dengan metode Plank dan katalis komposit disentesa berdasarkan penelitian yang telah dilakukan oleh Qjang Tang et all. Hasil yang telah berhasil disintesa dikarakterisasi dengan Energy Difraction X-Ray (EDX, X-Ray Difraction (XRD dan Brunaur Emmet Teller (BET. Dari hasil karakterisasi dapat disimpulkan bahwa katalis yang telah disintetis telah memenuhi syarat untuk digunakan sebagai katalis pada proses perengkahan. Proses perengkahan katalitik dilakukan dalam suatu mikroreaktor fixed bed dengan berat katalis yang digunakan sebanyak 2 gram dan proses perengkahan dimulai saat gas N2 dialirkan selama 60 menit. Proses perengkahan dilakukan pada variasi temperatur 350-550 °C dan laju alir gas N2 90-400 ml/min. Hasil perengkahan dianalisa dengan metode gas kromatografi. Hasil yang

  17. Le 'problème anglophone' au Cameroun dans les années 1990

    NARCIS (Netherlands)

    Konings, P.J.J.

    1996-01-01

    À la suite de la libéralisation politique au Cameroun au début des années 1990, une partie de l'élite anglophone a commencé à s'organiser en de nombreuses associations et groupes de pression pour protester contre la prétendue position subordonnée de la minorité anglophone dans un État unitaire

  18. Collectivités et exploitation minière au Canada et dans le monde ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Mines Alerte s'efforce, de trois manières, de faire en sorte que les pratiques de mise en valeur des ressources minérales soient compatibles avec des collectivités durables et avec la santé écologique : elle fournit un appui au renforcement des capacités et au réseautage dans les collectivités touchées par les activités ...

  19. L'entrepreneuriat au Canada dans le contexte mondial | CRDI ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    24 nov. 2014 ... Grâce au Global Entrepreneurship Monitor (GEM), des chercheurs canadiens et étrangers acquièrent et mettent en commun des connaissances sur les motivations des entrepreneurs et sur la façon de les aider à prospérer. Les gouvernements s'appuient sur leurs constatations pour élaborer des politiques ...

  20. Une invitation au voyage dans l'univers

    CERN Multimedia

    Garay, Corinne

    2009-01-01

    "Philippe de la Catardière, écrivain et journaliste originaire de Priay, publie un essai chez l'Archipel. "Comsmologie à usage du piéton". Il vulgarise pour le grand public les connaissances sur le ciel et l'étude de l'univers. Sa passion pour l'astronomie est née dans son enfance en regardant les ciels étoilés... elle ne l'a plus quitté" (2 pages)

  1. Typologie des anemies dans un service de reanimation medicale au ...

    African Journals Online (AJOL)

    En fonction du VGM et de la. TCMH, les anémies microcytaires normochromes étaient les plus fréquentes (32,86%) Conclusion : Au terme de notre étude, il se dégage que l'anémie n'est pas rare chez les patients admis à la réanimation médicale. Sa recherche s'avère donc systématique chez tous les patients hospitalisés.

  2. L'Islam et la femme dans l'espace public au Niger

    African Journals Online (AJOL)

    seriane.camara

    16 sept. 2010 ... qui était jusqu'alors réservé aux hommes. Timide au départ, cet investissement de la femme nigérienne dans l'espace public deviendra total à partir de la marche du 13 mai 1991 organisée pour revendiquer une représentation plus importante à la Conférence Nationale Souveraine devant se tenir en juillet ...

  3. L'emploi dans le secteur public au service du développement ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    10 déc. 2015 ... La recherche laisse croire que le CWP contribue à l'inclusion économique et sociale ainsi qu'au développement communautaire, et qu'il joue un rôle important dans la prévention du crime. Les chercheurs ont formulé des recommandations concrètes visant à améliorer le programme, y compris en ...

  4. Le recours aux catégories dans la gestion du choix au cours d’un repas au restaurant

    Directory of Open Access Journals (Sweden)

    Hugol-Gential Clémentine

    2012-07-01

    Full Text Available Ce travail, ancré dans le champ de l’Analyse Conversationnelle (Sacks, 1992, s’intéresse à une question centrale à laquelle les clients sont perpétuellement confrontés lors de la prise d’un repas au restaurant : le choix. Plus précisément, nous nous intéressons à son caractère situé et à son déploiement en interaction en nous basant sur un corpus audiovisuel collecté en situation « naturelle » de production, lors de repas au restaurant, afin d’étudier la parole-en-interaction telle qu’elle est localement produite et organisée par les participants (Heath, Hindmarsch & Luff, 2010. Après avoir exposé le lien entre identité et alimentation et la notion de catégorisation telle qu’elle a été développée en Analyse Conversationnelle, nous proposerons deux analyses de séquences de prise de commande pendant lesquelles les choix des clients sont discutés et négociés avec le sommelier ou le serveur. Grâce à des analyses séquentielles basées sur des transcriptions fines, nous soulignerons que les participants à l’interaction manifestent de façon reconnaissable qui ils sont (clients experts, non experts, habitués... afin d’organiser de façon intelligible leurs actions et de permettre à leurs partenaires de s’y ajuster. Nous analyserons finement les catégories utilisées par les participants, et nous décrirons les différents procédés mobilisés afin d’organiser et d’orienter la prise de commande. Ainsi, dans un premier extrait, nous verrons que les clients s’orientent, tout d’abord, vers l’exhibition de leur propre identité, tandis que dans un deuxième extrait, c’est le plat à la carte qui fait l’objet d’une première catégorisation. L’ensemble de ce travail nous permettra de montrer que les catégories sont structurantes pour l’organisation du choix et que leur déploiement séquentiel au cours de l’interaction est constitutif des affiliations ou des désaffiliations lors

  5. Faire territoire au quotidien dans les grands ensembles HLM

    Directory of Open Access Journals (Sweden)

    Denis la Mache

    2012-05-01

    Full Text Available Cet article propose une lecture anthropologique de la manière dont les habitants des grands ensembles de périphéries urbaines délimitent, administrent, transforment matériellement et symboliquement les espaces et les lieux de leur quotidien pour faire territoire. Nous nous intéresserons à la fabrication de ces entités spatiales dont chaque individu se donne la liberté de disposer chaque jour selon un usage singulier et qu’il entoure d’un champ symbolique spécifique, garant d’identité. Ces « fabrications sociospatiales » seront abordées à partir d’une recherche empirique menée auprès d’habitants de deux terrains d’enquêtes situés dans des périphéries de villes moyennes.This paper proposes an anthropological reading of how the inhabitants of large urban peripheries define, administer, and process their daily spaces and places from a material as much as symbolical point of view to give sense to their territory. We will focus on the making of these spatial entities, witch everyone can dispose of everyday individually, to guarantee their identity. These “socio spatial creations” will be based on an empirical research, that is to say surveys conducted among the suburbians of two towns.

  6. Le sociologue dans l’action collective face au risque

    Directory of Open Access Journals (Sweden)

    Marc Mormont

    2009-11-01

    Full Text Available Le risque est une composante centrale des sociétés industrielles modernes qui en ont organisé la prise en charge à travers une série de dispositifs complexes. Les questions environnementales font émerger de nouveaux risques dits modernes parce qu’ils échappent à ces dispositifs d’évaluation et de gestion. A côté d’attitudes de déni de ces risques on voit apparaître des dynamiques qui sont vues comme des dispositifs de capture des peurs qui ont pour effet de donner une emprise forte à ceux qui peuvent mettre en place des dispositifs de contrôle, qui peuvent détruire les collectifs organisés autour de pratiques vivantes. Le sociologue ne peut plus se contenter de répondre à une demande d’analyse des perceptions des risques ; il doit s’engager dans l’action collective qui confronte les collectifs aux risques pour aider à leur reconfiguration tout en préservant leur autonomie.Risk is a central component of modern industrial societies that have organised complex systems to tackle with them. Environmental problems progressively reveal new risks that are said modern risks because they can be dealt with through usual systems of risk assessment and management. If some authorities still deny these risks, it is important to observe new dynamics that are here described as capture of fear and that are giving strong power to those who are able to propose control systems. These systems can be destructive of many original and creative practices. Sociologist can not be confined in analysis of risk perception, he has to be involved in collective action that try to deal with risks by confronting different collectives and by reorganising them while preserving autonomy.

  7. LES OUTILS DE CONTROLE DE GESTION DANS LE CONTEXTE DES PME : CAS DES PMI AU LIBAN

    OpenAIRE

    Abi Azar, Jihane

    2005-01-01

    International audience; Longtemps négligée par la littérature spécialisée, la question du contrôle de gestion dans les PME a fait l'objet récemment de plusieurs études de terrain. Ces études portent principalement sur les PME des pays développés. Notre travail présente les résultats d'une étude empirique auprès de 6 industries du secteur agro-alimentaire au Liban. Il s'agit d'étudier les différents outils de contrôle de gestion utilisés dans les PMI libanaises et plus précisément, d'identifie...

  8. Campaign 1999-2001 of radon measurement in the establishments receiving public; Campagne 1999-2001 de mesures du Radon dans les etablissements recevant du public

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2001-11-15

    After some elements of context on the radon measurement in France, and a presentation of realised actions in 2001 by the Ministry in charge of health to manage the radon risk, this document exposes a synthesis in three parts on the situation of radon measurement campaigns in the establishments receiving public. The first part gives the methodology followed to make this state, the second part presents the synthetic results by department, and the last one the results at the regional level. (N.C.)

  9. Intégration des TIC dans la gouvernance locale au Sénégal | IDRC ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Intégration des TIC dans la gouvernance locale au Sénégal. Ce projet s'inscrit dans le contexte de la mise en oeuvre du plan d'action du Somment mondial sur la société de l'information (SMSI). Ce plan met l'accent entre autres sur la nécessité d'un partenariat public-privé pour permettre aux collectivités africaines un ...

  10. Le rôle des universités africaines dans l'innovation au service du ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Le rôle des universités africaines dans l'innovation au service du développement inclusif. Un nouveau réseau de recherche s'intéressera aux façons dont les universités africaines peuvent contribuer à stimuler l'innovation sur le continent noir. Le projet de recherche permettra d'examiner dans quelle mesure les universités ...

  11. Intégration des TIC dans l’enseignement des sciences physiques au Maroc dans le cadre du programme GENIE : difficultés et obstacles

    Directory of Open Access Journals (Sweden)

    Alj Omar

    2013-01-01

    Full Text Available Ce texte présente les résultats d’une recherche exploratoire que nous avons menée auprès de 125 enseignants de sciences physiques dans trois académies marocaines (Fès-Boulmane, Rabat-Salé et Tétouan-Tanger. L’objectif de ce travail est de mener une étude sur l’intégration des TIC dans l’enseignement des sciences physiques au secondaire au Maroc et également de recueillir les opinions des enseignants qui ont bénéficié de la formation à ces outils dans le cadre du programme GENIE. Les résultats obtenus montrent que 94,4 % des enseignants interrogés expriment un grand intérêt pour l’utilisation des TIC dans leurs pratiques pédagogiques. Cependant, seulement 8 % d’entre eux intègrent les TIC de façon régulière en classe. Ce paradoxe est dû principalement à trois obstacles. Le premier obstacle concerne l’insuffisance des équipements matériels au sein des établissements, le deuxième, le manque de logiciels et d’applications adaptés aux programmes enseignés, et le troisième la qualification et la formation des enseignants.

  12. Modelling and experimental study of the behavior of radon and radon decay products in an enclosure. Application to houses; Modelisation et etude experimentale du comportement du radon et de ses descendants dans une enceinte confinee. Application a une habitation

    Energy Technology Data Exchange (ETDEWEB)

    Gouronnec, A.M.

    1995-02-03

    Since the eighties, more and more studies were performed about radon and its decay products in houses with one of the aim being the estimation of the dose received by their inhabitants. Then, the principal objective of this work is to describe the behaviour of radon and its decay products within a dwelling. In the first part to the report, a few definitions are given and data from literature give an idea of indoor radon and radon decay products activities and/or size distribution. Aspects of dosimetry are presented too. In the second part of the work, a mathematical model, called `PRADDO` of Physic of Radon and radon Decay products in Domestic environment is developed on the basis of the classical model written by Jacobi in 1972. On the one hand, it has to predict radon decay products activities in systems consisting in one or more enclosure(s), from radon activity and from ambient aerosol concentration and size distribution. On the other hand, one part of the model is assigned to study the influence of the entry model parameters variation on the calculated quantities. Then, in the third part of the work, two experimental studies are realised in order to compare measurements to modelization. The first experimentation is a laboratory work, made on the test bench ICARE from IPSN, and the second one consists in describing the basement of an occupied house from Brittany. In the two cases, the comparison between experiments and modelling shows a good agreement if particles are present in the air, but any conclusion is made when is no aerosol in the enclosure. (author). 158 refs., 81 figs., 42 tabs.

  13. Test pilote du système de traçabilité du bois au Cameroun dans l ...

    African Journals Online (AJOL)

    L'objectif du test était d'évaluer le degré d'applicabilité et la pertinence des fonctionnalités du système de traçabilité du bois mis en place au Cameroun dans l'UFA 10 018. La méthodologie a été basée sur l'exploitation documentaire, les observations de terrain et les interviews. Cinq essences ont servi dans la simulation ...

  14. About the use of radon in the surveillance of volcanoes from Central America; De l`utilisation du radon dans la surveillance des volcans d`amerique centrale

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez, E. [Obviscori, Heridia (Costa Rica); Garcia Vindas, R.; Monnin, M.; Seidel, J.L. [Centre National de la Recherche Scientifique (CNRS), 34 -Montpellier (France). Centre d`Etudes Phytosociologiques et Ecologiques Louis-Emberger; Segovia, N. [ININ, Mexico (Mexico)

    1996-12-31

    Anomalous fluctuations of radon content in soil gases, fumaroles or thermal sources associated with volcanic systems are considered as precursors of deep degassing phenomena. Radon measurements in soil gases were performed for several years on three active volcanoes of Costa-Rica (Arenal, Irazu, Poas), also on El Chichon and Colima volcanoes in Mexico and more recently on the Popocatepetl since its reactivation in December 1994. Data acquisition was initially performed using plastic detectors with a 15 days integration. Since 1993, autonomous automatic probes are used and give hourly measurements. A nine stations network for ground measurements is installed on the Poas since 1982. Radon and Cl{sup -}, F{sup -} and SO{sub 4}{sup 2-} variations of the main crater lake are examined and correlated with the volcanic activity which led to the decay and disappearing of the lake in April 1989. On the Irazu, five stations were installed in 1982 and 3 automatic ones were added in November 1993. Results obtained so far are discussed according to the phreatic eruption of December 1994. The Popocatepetl measurements obtained since December 1994 are presented too. Abstract only. (J.S.).

  15. Files de pierres dressées dans le sud de l'Éthiopie et au nord du Kenya

    OpenAIRE

    Joussaume, Roger

    2015-01-01

    Les travaux de deux équipes américaines dans les années 1970 et 2000 ont fait connaître plusieurs sites à lignes de pierres dressées près du lac Turkana au nord du Kenya. Les plus anciens sont datés du début du IIIe millénaire avant notre ère, d’autres de la deuxième moitié du premier millénaire avant J.-C. Ils furent l’œuvre d’une société de pasteurs qui aurait connu la céramique. Dans le Sidamo, au sud de l’Éthiopie, les stèles phalliques des pays Gedeo et Sidama forment fréquemment des ali...

  16. Les réseaux d’investissement dans le thermalisme au XIXe siècle en France

    Directory of Open Access Journals (Sweden)

    Jérôme Penez

    2004-03-01

    Full Text Available Le XIXe siècle est le siècle de la « fièvre thermale » en France. Pour permettre cet extraordinaire développement, l’argent est nécessaire. La station thermale apparaît comme un eldorado où la fortune est à portée de la main. Cette fortune n’est pourtant pas si facile à obtenir, la gestion thermale est ingrate, et les centaines de villes d’eaux françaises ne peuvent pas toutes obtenir un succès comparable à celui de Vichy ou d’Aix-les-Bains. Le thermalisme français est diversité, diversité dans les réussites, diversité dans les types de gestion (de la gestion étatique à la gestion privée, diversité dans sa fréquentation, diversité dans ses périodes de développement, diversité dans les moyens de son financement. Etudier l’importance ou au contraire la rareté des réseaux d’investissement dans le thermalisme permet de lever une partie du voile de l’histoire encore bien mystérieuse des villes d’eaux françaises.

  17. Séroprévalence de Mycoplasma gallisepticum et de Mycoplasma synoviae dans les élevages reproducteurs type poulet de chair au Maroc de 1983 au 2005

    OpenAIRE

    Saadia NASSIK; R. RAHMATALLAH; O. FASSI FEHRI; M. EL HOUADFI

    2014-01-01

    Les mycoplasmoses aviaires, particulièrement Mycoplasma gallisepticum (MG) et Mycoplasma synoviae (MS) sont des infections insidieuses respiratoires, génitales ou articulaires, entraînant de lourdes pertes économiques dans les différents types d’élevage avicole.L’objectif de cette étude est de tracer l’évolution des infections mycoplasmiques aviaires dues à MG et MS à partir d’une synthèse des enquêtes sérologiques réalisées au Maroc et d’évaluer les retombées de la nouvelle loi sanitaire. Ce...

  18. L’interface Habitat / Habitant : quand le lieu de vie est porteur de maladie - Le cas du radon en PACA

    Directory of Open Access Journals (Sweden)

    Cissé E.

    2012-10-01

    Full Text Available Les préoccupations sont croissantes pour étudier les liens entre des conditions environnementales spécifiques et la fréquence de certaines pathologies. Nous proposons d’analyser ici le lien présupposé entre une exposition au radon et le cancer du poumon. Le radon, est un gaz radioactif d’origine naturelle (issu de la désintégration naturelle de l’uranium présent dans la croûte terrestre et plus particulièrement dans certaines formations géologiques. A partir du sol et de l’eau, le radon se diffuse dans l’air (exhalation et se trouve, par effet de confinement, à des concentrations plus élevées à l’intérieur des bâtiments qu’à l’extérieur. Les descendants solides du radon sont alors inhalés avec l’air respiré et se déposent dans le poumon. Il est établi par diverses études scientifiques que le radon a un impact non négligeable sur certains cancers, notamment du poumon (augmentation de 16 % du risque de cancer du poumon par tranche de 100 Bq/m3, et des cancers digestifs via la consommation d’eau qui s’est chargée en radon au contact du socle. Le nombre annuel de décès par cancer du poumon attribuable à l’exposition domestique au radon en France métropolitaine varie entre 1 200 à 3 575 en fonction des relations exposition-réponse utilisées. Plusieurs régions en France se caractérisent par une problématique radon reconnue et étudiée depuis longtemps (Bretagne, Massif central, Corse. Or, si le radon ne recouvre pas l’ensemble de la région PACA, certaines zones géographiques sont particulièrement concernées et méritent d’être étudiées : le Massif des Maures dans le Var, du Mercantour dans les Alpes-Maritimes et du Briançonnais dans les Hautes-Alpes. La région PACA est une des régions de France et d’Europe les plus touchées par la pollution atmosphérique principalement due à l’augmentation du trafic routier et des contributions de régions industrialisées telles que

  19. Le fait littéraire dans les manuels de français pour Espagnols au 18e siècle

    OpenAIRE

    Bruña Cuevas, Manuel

    2015-01-01

    Au 18e siècle, l'enseignement du français, comme celui des autres langues vivantes, a été peu porté sur tout ce qui avait trait à la littérature. Même les établissements innovateurs, ceux qui incorporaient dans leur plan d'études quelques disciplines scientifiques et quelque langue vivante, envisageaient celle-ci comme un instrument permettant l'accès à la production écrite dans la langue en question, mais à une production comprise au sens large, non restreinte au domaine littéraire; par là m...

  20. Que fait le salariat au militantisme dans les associations féministes ?

    Directory of Open Access Journals (Sweden)

    Dominique Loiseau

    2008-09-01

    Full Text Available Les associations de défense des droits des femmes, créées en France dans le contexte militant du féminisme des décennies 1960/1970 (MFPF, SOS femmes, CIDFF, affrontent aujourd'hui des difficultés paradoxales, au sens où elles résultent en partie de leur succès et de leur pérennisation. En effet, pour accroître l'efficacité militante, pour satisfaire aux besoins toujours existants de la population féminine à laquelle elles s'adressent, elles ont eu recours à la salarisation et se sont transformées en associations employeuses. Dans un contexte où elles ne peuvent guère offrir à leurs salariées que des emplois dévalorisés du fait de leur difficulté à assurer leur survie économique, elles entrent en contradiction avec leurs valeurs, sans en avoir toujours conscience dans un premier temps. L’arrivée des salariées interroge donc le militantisme des « militantes employeuses ». Mais passés les premiers temps de déstabilisation, les associations tentent de rebondir et de mettre en place des solutions ménageant les deux dimensions militante et professionnelle qu’elles souhaitent continuer à concilier.Las asociaciones de defensa de los derechos de las mujeres, creadas en Francia en el contexto del feminismo militante de las décadas 1960/1970 (MFPF, SOS CIDFF mujeres, se enfrentan actualmente a dificultades paradójicas, en el sentido de que, en parte, resultan de su éxito y su sostenibilidad. De hecho, para aumentar la eficiencia de la militancia, para satisfacer las necesidades aún existentes de la población femenina a la que se dirigen, han recurrido a empleados y se han convertido en asociaciones de empleadores. En un contexto en el que sólo pueden ofrecer a sus empleados puestos de trabajo devaluados a causa de su dificultad para garantizar su supervivencia económica, están en contradicción con sus valores, pero no siempre son conscientes de esto. La llegada de las empleadas entrevistadas, por lo tanto

  1. Development of a predictive methodology for identifying high radon exhalation potential areas; Mise au point d'une methodologie predictive des zones a fort potentiel d'exhalation du radon

    Energy Technology Data Exchange (ETDEWEB)

    Ielsch, G

    2001-07-01

    Radon 222 is a radioactive natural gas originating from the decay of radium 226 which itself originates from the decay of uranium 23 8 naturally present in rocks and soil. Inhalation of radon gas and its decay products is a potential health risk for man. Radon can accumulate in confined environments such as buildings, and is responsible for one third of the total radiological exposure of the general public to radiation. The problem of how to manage this risk then arises. The main difficulty encountered is due to the large variability of exposure to radon across the country. A prediction needs to be made of areas with the highest density of buildings with high radon levels. Exposure to radon varies depending on the degree of confinement of the habitat, the lifestyle of the occupants and particularly emission of radon from the surface of the soil on which the building is built. The purpose of this thesis is to elaborate a methodology for determining areas presenting a high potential for radon exhalation at the surface of the soil. The methodology adopted is based on quantification of radon exhalation at the surface, starting from a precise characterization of the main local geological and pedological parameters that control the radon source and its transport to the ground/atmosphere interface. The methodology proposed is innovative in that it combines a cartographic analysis, parameters integrated into a Geographic Information system, and a simplified model for vertical transport of radon by diffusion through pores in the soil. This methodology has been validated on two typical areas, in different geological contexts, and gives forecasts that generally agree with field observations. This makes it possible to identify areas with a high exhalation potential within a range of a few square kilometers. (author)

  2. Uranium prospecting using radon (1963); La prospection de l'uranium par le radon (1963)

    Energy Technology Data Exchange (ETDEWEB)

    Pradel, J.; Billard, F.; Miribel, J.; Gangloff, A.; Puybaraud, Y.; Tayeb, G. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1963-07-01

    The radon which diffuses in the ground and which migrates in the atmosphere is a natural radioactive tracer. The study of its production can give useful information on the uranium content and structure of the rocks from which it comes. Numerous authors have therefore suggested that uranium deposits be prospected by means of this radon. Three analytic methods have been used successively by the C.E.A.: the method of accumulation in a hole, the method of instantaneous sampling in the ground, and the method of sampling by scanning. Only the last has proved interesting and has been the object of systematic studies. It consists in purging the measurement recipient with air drawn from the probe and in measuring the variations in activity with time and with the volume drawn up, using a portable apparatus producing scintillations in a sulphurated flask. The first series of measurements made it possible to develop an apparatus (flow rate, hole depth, scintillating probe) and to distinguish between tbe activities of the thoron and of the radon by making two measurements at an interval of 54 seconds. A campaign of systematic sampling was then carried out. It made It possible to show the good reproducibility of the results obtained and tbe good agreement with conventional methods. This method is the best one for areas having large overlap. In the appendix the detector and its mode of use are briefly described, and the first results of an emanometric prospecting test in the Vendee mining division are given. (authors) [French] Le radon qui diffuse dans le sol et migre dans l'atmosphere constitue un traceur radioactif naturel. L'etude de son degagement peut apporter de precieux renseignements sur la teneur en uranium et la structure des roches dont il est issu. De nombreux auteurs ont donc propose la prospection des gisements d'uranium par le radon. Trois methodes d'analyse ont ete successivement utilisees au C.E.A.: la methode d'accumulation dans un trou

  3. Savoirs locaux et apprentissage du partenariat dans la gestion des écosystèmes forestiers humides au Cameroun

    OpenAIRE

    Bidzanga Nomo, L.; Kalms, Jean-Marie; Havard, Michel; Njoya, Aboubakar

    2011-01-01

    Les écosystèmes forestiers humides du Cameroun subissent une pression accrue sur les ressources forestières et sur la terre liée à l'augmentation rapide de la population. Les agriculteurs s'adaptent en mobilisant leurs savoirs et développant des pratiques innovantes de gestion des écosystèmes forestiers dont la durabilité est mise en cause. Pour accompagner les agriculteurs dans ces évolutions, l'Association pour le développement des exploitations agricoles du centre (ADEAC) au Cameroun, en p...

  4. Du féminin dans les discours militaires au XVIIIe siècle

    Directory of Open Access Journals (Sweden)

    Naoko Seriu

    2007-11-01

    Full Text Available Inventer une nouvelle figure du soldat est un enjeu des réformes militaires dans la seconde moitié du XVIIIe siècle. Répondant à la volonté réformatrice des ministres, les officiers rédigent des mémoires sur ce que doit être l'homme de troupe. En marge de ces écrits, apparaissent des propos qui condamnent sévèrement les femmes, considérées comme ennemies de la discipline. La figure féminine peut également servir à stigmatiser les soldats indignes qu'il conviendrait d'habiller en femme. En faisant écho au débat sur le luxe, les officiers produisent un discours qui dévalorise les femmes, séparées d'emblée du reste de l'humanité. Si telle est la configuration qui ressort du discours, qu'en est-il des pratiques ? A travers l'analyse de quelques récits de vie militaire - émanant d'officiers et soldats - il est question de montrer comment cette catégorisation fonctionne d'une manière opératoire, l'évocation seule des femmes pouvant assurer la cohésion de cette société d'hommes.The invention of a new figure of the soldier was at stake in the military reforms of the second half of the eighteenth century. In response to the reform efforts of the ministers of war, officers wrote memoranda about what a soldier should be. At the margins of these proposals, one finds comments that denounce women as enemies of discipline. The feminine figure also appears in the denunciation of unworthy soldiers who should then be dressed as female. Echoing the debate on luxury, officers produced discourses that degrade women and situate them outside the pale of humanity. To what extent is this denunication within military discourse present in actual practice? Through the analysis of accounts and stories about military life, from both officiers and soldiers, this article demonstrates how this categorization functioned, and how the mere mentioning of woman ensured the cohesion of this male society.

  5. La flexion et l’analytisme des substantifs en -a dans le dialecte du village de Gatnje, situe au sud du Kosovo

    Directory of Open Access Journals (Sweden)

    Mladenović Radivoje M.

    2012-01-01

    Full Text Available Dans la presente etude, nous examinons la declinaison des substantifs feminins et masculins en-a dans le dialecte du village de Gatnje, situe au sud du Kosovo. Du fait qu’il a bien conserve la flexion des substantifs en -a, le village de Gatnje peut etre rattache au type des parlers du sud de la Metochie, du sud et centre du Kosovo, qui appartiennent a la grande aire linguistique de Prizren - Sud de la Morava. Un plus grand nombre de cas se sont conserves au singulier qu’au pluriel. Nous avons constate que la flexion est bien conservee dans un grand nombre de constructions avec des prepositions regissant le genitif au singulier, et que l’influence de l’analytisme dans ces constructions ne peut etre observe que dans un petit nombre d’exemples, a l’exception de l’instrumental. La forme du datif singulier s’est bien conservee avec la signification d’attribution, de possession et de direction. Les constructions po + locatif singulier et prema + locatif singulier se sont egalement bien conservees, et nous avons meme pu constate des constructions u + locatif singulier et na + locatif singulier dans un moindre nombre d’exemples. A part les noms de personnes comportant plus de deux syllabes - qui ont un vocatif singulier identique au nominatif - les autres substantifs ont soit la terminaison -o (sestro, dušo, soit la terminaison -e pour les substantifs en -ka (Ljupke, strinke. La diversite des formes du datif pluriel des substantifs en -a (kravama, kravima, kravema, kravami s’explique par le contact avec les formes du datif d’autres types de declinaisons. [Projekat Ministarstva nauke Republike Srbije, br. 178020: Dijalektološka istraživanja srpskog jezičkog prostora

  6. Assessment of the 2005-2008 action plan. For the management of the risk related to radon; Bilan du plan d'actions 2005-2008. Pour la gestion du risque lie au radon

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2009-12-15

    This report proposes a detailed assessment of 27 priority actions identified in 2005 to improve the management of the risk related to radon within the frame of a public health policy. These actions are grouped under three main orientations: to build up a new policy for the management of the radon-related risk in housing and new buildings, to support and control the implementation of the regulation for the management of this risk in premises open to the public, and to improve and diffuse knowledge about radon-related exposures and risk

  7. Radon in Schools

    Science.gov (United States)

    ... Search Search Radon Contact Us Share Radon in Schools Related Information Managing Radon in Schools Radon Measurement ... Radon Could Be a Serious Threat to Your School Chances are you've already heard of radon - ...

  8. Durer au travail dans les métiers de l'informatique : quelles conditions de possibilité ? : Etude sociologique des devenirs de cadres informaticiens

    OpenAIRE

    Poussou-Plesse, Marielle; Denis, Duplan; Constance, Perrin-Joly; Guillemard, Anne-Marie

    2008-01-01

    La recherche pose la question de la longévité professionnelle dans les métiers de l'informatique dans le cadre d'un système d'emploi. Le fait économique structurant de ces métiers est bien leur inscription dans une chaîne de valeur distinguant des fabricants (constructeurs de matériel informatique et éditeurs de logiciels), des intermédiaires (au premier chef, des Sociétés de services et d'ingénierie informatiques) et des utilisateurs finaux. Ces maillons constituent des segments d'employeurs...

  9. L'Islam et la femme dans l'espace public au Niger

    African Journals Online (AJOL)

    seriane.camara

    16 sept. 2010 ... Conseil pour le développement de la recherche en sciences sociales en Afrique,. 2009 (ISSN .... les musulmans réclamaient, sinon l'instauration de la shari'a (loi musulmane) comme dans certains Etats du ..... certains journaux, ont bravé la police en marchant dans les rues de Niamey et de l'intérieur du ...

  10. The radon 222 transport in soils. The case of the storage of residues coming from uranium ores processing; La migration du radon 222 dans un sol. Application aux stockages de residus issus du traitement des minerais d'uranium

    Energy Technology Data Exchange (ETDEWEB)

    Ferry, C

    2000-07-01

    Uranium Mill Tailings (UMT) contain comparatively large quantities of radium-226. This radionuclide yields, by radioactive decay, the radioactive gas radon-222. Tailing piles are routinely covered to reduce the radon release-rate into the atmosphere. In order to assess the long term environmental impact of a UMT repository, mechanisms governing radon exhalation at the soil surface must be deciphered and understood. A model of radon transport in the unsaturated zone is developed for this purpose: water- and air-flow in the porous material are determined, as well as radon transport by diffusion in the pore space and advection by the gas phase. The radon transport model in the unsaturated zone - TRACI (which stands, in French, for Radon Transport within the Unsaturated Layer) - calculates moisture contents in the soil, Darcy's velocities of the liquid and gas phases, radon concentrations in the gas phase and radon flux at the soil surface. TRACI's results are compared with observations carried out on a UMT and a cover layer. Input parameters are derived from the textural analysis of the material under study, whereas upper boundary conditions are given by meteorological data. If we consider measurement errors and uncertainties on the porous medium characterisation, model's results are generally in good agreement with observations, at least on the long run. Moreover, data analysis shows hat transient phenomena are understood as well, in most situations. (author)

  11. Permanences bilatérales dans l’aide au développement en Afrique subsaharienne

    Directory of Open Access Journals (Sweden)

    Thierry Simon

    2010-12-01

    Full Text Available Le continent africain vient de connaître cinquante années d’aide au développement, entamées au lendemain des indépendances. Elles se sont traduites par un empilement d’aides budgétaires massives et de programmes sectoriels variés, d’une profusion de projets et « micro-projets ». Dans cette véritable nébuleuse du développement, c’est la dynamique de l’aide bilatérale française et britannique que l’on tente de cerner ici, avec le recul de ce demi-siècle, en examinant notamment l’évolution des enveloppes spatiales dans lesquelles cette aide a été concédée et les « projets », inscrits dans un cadre national, qui ont matérialisé une partie importante de cette aide. L’aide bilatérale est toujours fragile, souvent contestée, largement remise en cause, mais elle perdure en s’adaptant et pourrait même trouver une nouvelle dynamique dans un contexte marqué par l’émergence de nouveaux acteurs bilatéraux.The African continent has just experienced fifty years of aid for development that began shortly after its different countries had obtained their own independence. This period witnessed the piling up of a formidable amount of budgetary help and various sectorial programmes, with a wealth of projects and micro-projects. Drawing on the hindsight of this last half-century, this paper attempts to focus on the process of French and British bilateral aid within the nebula of this expansion. Particular attention will be paid to the development of the territorial zones, where this financial assistance was granted and the projects that benefited from a large part of it in the context of nationwide frameworks. Bilateral aid is always vulnerable and the source of much controversy and debate. It continues to endure by adjusting to meet changing circumstances and may well find renewed vigour in the context of a background coloured by the rising of new bilateral players.

  12. Approches transdisciplinaires de l’éducation au développement durable dans l’enseignement secondaire

    Directory of Open Access Journals (Sweden)

    Christine Vergnolle Mainar

    2009-07-01

    Full Text Available Dans l’enseignement secondaire français, l’éducation au développement durable (EDD suppose que les disciplines scolaires passent d’une logique exclusivement disciplinaire à une logique de contribution à un objectif transdisciplinaire. Cette évolution donne une importance cruciale aux circulations de concepts entre disciplines, à leurs thématiques communes et aux interactions qui se sont développées à leurs frontières. Sont pris comme exemples, la frontière entre la géographie et les sciences de la vie et de la Terre ainsi que le concept de paysage.

  13. Les efflorescences phytoplanctoniques dans le golfe de gabes (Tunisie) au cours de dix ans de surveillance (1995-2005)

    OpenAIRE

    Feki, W.; Hamza, A.; Bel Hassen, M.; Rebai, A.

    2008-01-01

    Les données du Réseau National de Surveillance Phytoplanctonique ont été examinées dans le golfe de Gabes durant la période 1995-2005. Un intérêt particulier a été attribué au phénomène de bloom phytoplanctonique. En outre, nous avons examiné plus spécifiquement les variations spatio-temporelles des espèces responsables et les relations avec la variabilité des conditions abiotiques, essentiellement la température, la salinité et le pH. Les résultats ont montré que la période allant d’août ...

  14. Les efflorescences phytoplanctoniques dans le golfe de Gabes (Tunisie) au cours de dix ans de surveillance (1995-205)

    OpenAIRE

    Feki, W.; Hamza, A.; Bel Hassen, M.; Rebai, A.

    2008-01-01

    Les données du Réseau National de Surveillance Phytoplanctonique ont été examinées dans le golfe de Gabes durant la période 1995-2005. Un intérêt particulier a été attribué au phénomène de bloom phytoplanctonique. En outre, nous avons examiné plus spécifiquement les variations spatio-temporelles des espèces responsables et les relations avec la variabilité des conditions abiotiques, essentiellement la température, la salinité et le pH. Les résultats ont montré que la période allant d’août ...

  15. Le risque dans l’entreprise : du drame du je, au tragique du jeu

    OpenAIRE

    Stéphane Hugon; Jawad Mejjad

    2015-01-01

    L’entreprise, structure organisatrice de la modernité et fine pointe de ses valeurs, concentre les richesses de nos sociétés, mais cette richesse est-elle encore en rapport avec une prise de risque ? Le risque est-il encore une valeur dans l’entreprise ? Notre but dans ce travail est de comprendre d’abord comment l’entreprise est devenue la structure fondamentale de la modernité et comment elle a été structurée autour du risque, ensuite d’évaluer les profonds changements que connait l’entrepr...

  16. Le CERN au féminin Le Web, Dan Brown et les trous noirs

    CERN Multimedia

    Brouet, Anne-Muriel

    2008-01-01

    The image of CERN changed with the birth of the Web: it made internet available for everybody; The other thing that drew a lot the attention on CERN is the book by Dan Brown "Angles and Demons". (1/4 page)

  17. Finnish practice in building radon-safe houses - a survey of municipal authorities

    International Nuclear Information System (INIS)

    The study was carried out to chart radon prevention practices in municipalities with high indoor radon concentrations. The area under investigation consists of 95 municipalities in the most radon-prone area in Finland. About 75% of the municipalities investigated required or recommended reaction to radon at least in certain areas of the municipality, but only 30% of municipalities recommended such action in the whole area. The most important prevention measure against radon, radon-tight foundation construction, was recommended in only a few municipalities. Only about one fifth of the municipalities verified that the builders had succeeded in radon-safe construction by measuring indoor radon concentration in the new houses. (au)

  18. LA RÉCENTE DINAMIQUE GEOECONOMIQUE DE LA CHAINE DE PRODUCTION DE SOJA AU BRÉSIL ET DANS LE MONDE

    Directory of Open Access Journals (Sweden)

    Roberto César Cunha

    2015-07-01

    Full Text Available L’agro-industrie de soja consolidé, au Brésil, à partir des années 1980, se constitue comme une des principales chaînes productives de la structure agricole brésilienne, offrant des grains, son de blé e d’huiles pour l’approvisionnement du marché interne et externe. Dans la récolte 2013/2014, la production a atteint plus de 87 millions de tonnes cultivées en trente millions hectares, qui représentent juste 8,9% dans la domaine cultivées au Bresil. Les exportations de soja em grains couvrent 42 millions de tonnes dans l’année agricole 2012/2013, l’équivalent a U$ 22,8 milliards. Les segments de grains, huile e son de blé ont gagné U$ S 31 milliards, qui signifie 12,8 % de toutes les ventes externes du Brésil et 31 % des exportations de l’agro-industrie brésiliens. Ce texte a pour objectif d’identifier les facteurs responsables de la recente dinamique de cette chaîne productive dans le territoire bresilien et son insertion au marché mondial.

  19. Écritures dans les Amériques au féminin

    OpenAIRE

    Alexoae-Zagni, Nicoleta; Anderson-González, Maya; Carrière, Marie; Clarke, Deborah; Courau, Thérèse; Dufaure, Sarah; Durrans, Stéphanie; Faubert, Samantha; Goodman, Audrey; Guicharnaud-Tollis, Michèle; Lauwers, Margot; Lepage, Caroline; Magras, Romain; Manera, Giulia; Marchio, Julie

    2017-01-01

    Issue d’un congrès de l’Institut des Amériques (IdA) organisé à Aix-Marseille Université sur le thème « Femmes dans les Amériques », la vingtaine d’études réunies dans cet ouvrage examine de quelle manière les femmes écrivains confrontent leur écriture à la représentation d’une « expérience américaine » pour en exposer les anxiétés, les failles ou les parasitages idéologiques et fantasmatiques en recourant à une subjectivité féminine travaillée par l’altérité. L’objectif d’ensemble n’est en ...

  20. De la capitalisation des connaissances au management des connaissances dans l'entreprise

    OpenAIRE

    Grundstein, Michel

    2004-01-01

    Après une réflexion sur la «problématique de capitalisation sur les connaissances dans l’entreprise », cet article positionne et met en perspective les activités et les dimensions du « Management des Connaissances dans l’entreprise » qui en découle. Il suggère un axe de progrès, propose de développer des initiatives selon quatre grandes orientations et induit une vision prospective du système d'information numérique centré sur le poste de travail informatisé de l'acteur-décideur....

  1. Du gris au vert - L'espoir reprend racine dans les hautes terres d ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    15 déc. 2010 ... Dans le district de Kabale, en Ouganda, trop de personnes tentent d'assurer leur subsistance à partir de trop peu de terre cultivable. En raison de cette surpopulation et de l'appauvrissement des sols attribuable à la culture intensive, la région est sur son déclin. Forts de l'appui du CRDI, chercheurs et ...

  2. performances d'une nouvelle approche dans l'estimation au champ ...

    African Journals Online (AJOL)

    ACSS

    La technique isotopique indirecte, basée sur le principe de dilution du marquage isotopique par l'azote issu de la minéralisation des résidus organiques non enrichies de l'15N, a l'avantage d'être plus simple et moins onéreuse que la technique directe (par ...... et Goh (2000) et de Zagal et al. (2003). Dans ce sens Zagal et ...

  3. Séroprévalence de Mycoplasma gallisepticum et de Mycoplasma synoviae dans les élevages reproducteurs type poulet de chair au Maroc de 1983 au 2005

    Directory of Open Access Journals (Sweden)

    Saadia NASSIK

    2014-03-01

    Full Text Available Les mycoplasmoses aviaires, particulièrement Mycoplasma gallisepticum (MG et Mycoplasma synoviae (MS sont des infections insidieuses respiratoires, génitales ou articulaires, entraînant de lourdes pertes économiques dans les différents types d’élevage avicole.L’objectif de cette étude est de tracer l’évolution des infections mycoplasmiques aviaires dues à MG et MS à partir d’une synthèse des enquêtes sérologiques réalisées au Maroc et d’évaluer les retombées de la nouvelle loi sanitaire. Ces enquêtes ont concerné 12, 13 et 15 élevages de poules reproductrices situés dans différentes régions, notamment les principaux axes de productions avicoles réalisées respectivement en 1983, 2002 et 2005. Les sérums recueillis ont été testés par Agglutination Rapide sur Lame (ARL afin d’identifier les élevages positifs. Les résultats sérologiques ont révélé la présence des anticorps contre MG et MS avec des taux d’infection variables en fonction de l’année d’étude et du germe. En effet, Les prévalences obtenues sont très importantes surtout pour MS qui dépassent les 50% ; un pic a été noté en 2002 (MG:30,76% et (MS:76,92%, avec une légère régression en 2005 (MG:26,67% et (MS:66,67 %.Ces taux d’infections non négligeables incitent à l’amélioration des normes d’hygiène et de biosécurité avec un accompagnement vétérinaire rigoureux conformément aux directives de la loi.

  4. ERRICCA radon model intercomparison exercise

    International Nuclear Information System (INIS)

    Andersen, C.E.; Albarracin, D.; Csige, I.; Graaf, E.R. van der; Jiranek, M.; Rehs, B.; Svoboda, Z.; Toro, L.

    1999-04-01

    Numerical models based on finite-difference or finite-element methods are used by various research groups in studies of radon-222 transport through soil and building materials. Applications range from design of radon remediation systems to more fundamental studies of radon transport. To ascertain that results obtained with these models are of good quality, it is necessary that such models are tested. This document reports on a benchmark test organized by the EU project ERRICCA: European Research into Radon in Construction Concerted Action. The test comprises the following cases: 1) Steady-state diffusive radon profiles in dry and wet soils, 2) steady-state entry of soil gas and radon into a house, 3) time-dependent radon exhalation from a building-material sample. These cases cover features such as: soil heterogeneity, anisotropy, 3D-effects, time dependency, combined advective and diffusive transport of radon, flux calculations, and partitioning of radon between air and water in soil pores. Seven groups participated in the intercomparison. All groups submitted results without knowing the results of others. For these results, relatively large group-to-group discrepancies were observed. Because of this, all groups scrutinized their computations (once more) and engaged in follow-up discussions with others. During this debugging process, problems were indeed identified (and eliminated). The accordingly revised results were in better agreement than those reported initially. Some discrepancies, however, still remain. All in all, it seems that the exercise has served its purpose and stimulated improvements relating to the quality of numerical modelling of radon transport. To maintain a high quality of modelling, it is recommended that additional exercises are carried out. (au)

  5. Gestion de classe dans l'enseignement secondaire au Benin: quels ...

    African Journals Online (AJOL)

    La gestion de classe (GC) constitue la préoccupation majeure des enseignants débutants ainsi que leur principale source de difficultés. Le but de cette étude est triple à savoir l'exploration des perceptions des enseignants débutants relativement à la GC, la description des problèmes rencontrés par ces derniers au cours ...

  6. Indoor radon

    International Nuclear Information System (INIS)

    1997-12-01

    The radon, a natural radioactive gas, is present almost everywhere on the earth's surface. It can be accumulated at high concentration in confined spaces (buildings, mines, etc). In the last decades many studies conducted in several countries showed that inhaling important amounts of radon rises the risk of lung cancer. Although, the radon is a naturally appearing radioactive source, it may be the subject of a human 'enhancement' of concentration. The increasing radon concentration in professional housing constitutes an example of enhanced natural radioactivity which can induce health risks on workers and public. Besides, the radon is present in the dwelling houses (the domestic radon). On 13 May 1996, the European Union Council issued the new EURATOM Instruction that establishes the basic standards of health protection of population and workers against the ionizing radiation hazards (Instruction 96/29/EURATOM, JOCE L-159 of 29 June 1996). This instruction does not apply to domestic radon but it is taken into consideration by another EURATOM document: the recommendation of the Commission 90/143/EURATOM of 21 February 1990 (JOCE L-80 of 27 March 1990). The present paper aims at establishing in accordance to European Union provisions the guidelines for radon risk management in working places, as well as in dwelling houses, where the implied risk is taken into account. This document does not deal with cases of high radon concentration on sites where fabrication, handling or storage of radium sources take place. These situations must be treated by special studies

  7. L'Islam et la femme dans l'espace public au Niger | Alio | Africa ...

    African Journals Online (AJOL)

    Le but de cet article est de montrer comment la femme nigérienne a négocié et continue de négocier sa citoyenneté dans un pays à 99 pour cent musulman. Dès l'indépendance, on voit nettement le jeu d'équilibre que faisait le président Diori Hamani pour préserver la laïcité du pays et les droits de chaque composante de ...

  8. L’espace domestique au Bronze final et au premier âge du Fer dans le sud de la Corse

    Directory of Open Access Journals (Sweden)

    Peche-Quilichini, Kewin

    2015-12-01

    organización general como a nivel del espacio interno y de la arquitectura de las viviendas. [fr] L’objectif de cet article est de fournir une approche synthétique sur les formes de l’habitat en Corse au Bronze final (BF et au premier âge du Fer (F1, à l’échelle de la microrégion montagneuse de l’Alta Rocca, située dans le sud de la Corse, au coeur du bassin occidental de la Méditerranée. La problématique d’étude des sites protohistoriques non fortifiés est jeune sur l’île, mais les travaux se sont récemment multipliés et rendent compte de la complexité structurelle et évolutive des espaces habités, permettant ainsi une premiére analyse comparative. Le raisonnement s’appuie essentiellement sur l’apport des fouilles du grand habitat de Cuciurpula, initiées en 2008 et toujours en cours, ainsi que sur l’exploitation des villages de Puzzonu et de Nuciaresa, sondés en 2012. La chronologie des secteurs étudiés permet d’embrasser un arc chronologique complet entre le XIIe et le VIe siécle av. J.-C., et donc d’appréhender les phénoménes évolutifs, tant en termes d’organisation générale qu’au niveau de l’espace interne et de l’architecture des habitations.

  9. Remarques sur certains archaïsmes iconographiques dans les peintures murales byzantinisantes de la Pologne au XVe siècle

    Directory of Open Access Journals (Sweden)

    Semoglou Athanassios

    2008-01-01

    Full Text Available (francuski L'étude des certains rarissimes archaïsmes iconographiques dans les peintures murales de style byzantin en Pologne de l'époque du roi Ladislas Jagiello (fin du XIVe - début du XVe siècle a révélé la pénétration d'une tradition riche et originale qui remonte au milieu syro-palestinien des premiers siècles du christianisme. Ce langage pictural conservateur traduit le phénomène du retour à des formules archaïques et s'inscrit dans l'effort, de la part du roi, d'harmoniser les tensions politiques et religieuses des deux communautés du pays (orthodoxe et catholique, grandi après l'union du grand Duché de Lituanie au royaume de Pologne en 1386. .

  10. Les coopérations au développement durable en question dans les pays du Sud

    Directory of Open Access Journals (Sweden)

    Géraldine Froger

    2010-05-01

    Full Text Available Après avoir identifié la coopération décentralisée, ses champs d’action, l’évolution de ses modalités d’intervention ainsi que les ambiguïtés auxquelles elle est confrontée en matière d’appui au développement durable dans les pays du Sud, nous nous focalisons sur les politiques et programmes de développement durable relevant principalement de formes plus classiques de coopération. Toutefois, la gouvernance décentralisée des ressources naturelles et de l’environnement promue par ces formes classiques de coopération est confrontée à de nombreuses difficultés, notamment à Madagascar. La coopération décentralisée peut agir de manière complémentaire mais ses conditions de réussite dépendent, entre autres, du succès des processus de décentralisation dans les pays du Sud.After identifying decentralized cooperation, its fields of action, changes in its procedures and the ambiguities it faces in supporting sustainable development in developing countries, we focus on sustainable development policies and programs based on more conventional forms of cooperation. However, the decentralized governance of natural resources and environment promoted by these conventional forms of cooperation is facing many difficulties, particularly in Madagascar. Decentralized cooperation can be complementary but its conditions for success depend, among other things, on the success of decentralization processes in the South.

  11. Facteurs influençant l'initiation au traitement antirétroviral des personnes vivant avec le VIH dans les Centres de Traitement Agréés de Bamenda et de Bertoua au Cameroun

    Science.gov (United States)

    Mbopi-Keou, Francois-Xavier; Voundi, Esther Voundi; Kalla, Ginette Claude Mireille; Emah, Irène; Angwafo, Fru; Muna, Walinjom

    2014-01-01

    Introduction L'objectif de ce travail était de déterminer les facteurs influençant l'initiation au traitement antirétroviral des personnes vivant avec le VIH (PVVIH) dans les centres de traitements agrées (CTA) de Bamenda et de Bertoua au Cameroun. Méthodes Il s'agissait d'une étude transversale, analytique réalisée de Janvier à Avril 2011, dans les CTA de Bamenda et de Bertoua. Pour cette étude, nous avons obtenu une clairance éthique. Résultats Nous avons étudiés 460 dossiers de patients séropositifs en phase d'initiation au traitement antirétroviral dans les CTA de Bamenda et de Bertoua, 53,9% et 46,1% respectivement. L ‘âge médian était de 36 ans. La plupart des séropositifs à Bertoua (41) avaient fait un dépistage volontaire du VIH par rapport à ceux de Bamenda (22) (p= 0.008). Il y ‘avait plus de VIH de type 1 et 2 dans le CTA de Bamenda (15) par rapport à Bertoua (3) (p= 0.011). La majorité des patients était classé au stade clinique II à Bamenda (54,0%) tandis qu ‘à Bertoua le stade clinique III était prédominant (52,4%) (p = 0,000). Le taux médian de CD4 était de 133 cellules/mm3 dans le CTA de Bamenda et de 175 cellules/mm3 à Bertoua (p = 0,008). La Zidovudine était plus prescrit à Bamenda et le Ténofovir à Bertoua (p = 0,000). L ‘Efavirenz était plus prescrit à Bertoua tandis que la Névirapine l ‘était plus à Bamenda (p = 0,000). Le Lopinavir/r était plus prescrit à Bamenda qu ‘à Bertoua (p = 0,017). Conclusion Il apparait urgent de standardiser la prise en charge des PVVIH dans les CTA du Cameroun. PMID:25184023

  12. M. G.-F. Leclerc, Préfet de la Haute-Savoie lors de sa visite dans le tunnel du LHC au Point 2 avec D. Delikaris, Département Technologie; dans la caverne de l'expérience ALICE avec B. Erazmus, Collaboration ALICE et lors de la signature du livre d'or avec F. Bordry, Chef du Département Technologie. P. Fassnacht, Conseiller au Bureau des Relations internationales présent.

    CERN Multimedia

    Jean-Claude Gadmer

    2013-01-01

    M. G.-F. Leclerc, Préfet de la Haute-Savoie lors de sa visite dans le tunnel du LHC au Point 2 avec D. Delikaris, Département Technologie; dans la caverne de l'expérience ALICE avec B. Erazmus, Collaboration ALICE et lors de la signature du livre d'or avec F. Bordry, Chef du Département Technologie. P. Fassnacht, Conseiller au Bureau des Relations internationales présent.

  13. Scopingsreport Radon

    OpenAIRE

    Blaauboer RO; Vaas LH; Hesse JM; Slooff W

    1989-01-01

    Dit scopingsrapport vormt een onderdeel van de voorbereiding tot het opstellen van het basisdocument radon. Het doel van dit rapport is het algemene kennisniveau van de deelnemers aan de scopingsbijeenkomst aangaande radon op eenzelfde peil te brengen en discussie- en beslispunten inzake de inhoud van het basisdocument aan te dragen.

  14. Scopingsreport Radon

    NARCIS (Netherlands)

    Blaauboer RO; Vaas LH; Hesse JM; Slooff W

    1989-01-01

    Dit scopingsrapport vormt een onderdeel van de voorbereiding tot het opstellen van het basisdocument radon. Het doel van dit rapport is het algemene kennisniveau van de deelnemers aan de scopingsbijeenkomst aangaande radon op eenzelfde peil te brengen en discussie- en beslispunten inzake de

  15. Project Radon

    International Nuclear Information System (INIS)

    Ekholm, S.

    1988-01-01

    The project started in March 1987. The objective is to perform radon monitoring in 2000 dwellings occupied by people employed by State Power Board and to continue to contribute to the development of radon filters. The project participates in developing methods for radon measurement and decontamination and in adapting the methods to large scale application. About 400 so called radon trace measurements (coarse measurement) and about 10 action measurements (decontamination measurement) have been made so far. Experience shows that methods are fully applicable and that the decontamination measures recommended give perfectly satisfactory results. It is also established that most of the houses with high radon levels have poor ventilation Many of them suffer from moisture and mould problems. The work planned for 1988 and 1989 will in addition to measurements be directed towards improvement of the measuring methods. An activity catalogue will be prepared in cooperation with ventilation enterprises. (O.S.)

  16. Mesure par diffraction des rayons X des microdéformations dans des films minces texturés d'Au

    OpenAIRE

    Durand , N.; Bimbault , L.; Badawi , K.; Goudeau , Ph.

    1994-01-01

    Cette étude présente une analyse des microdéformations dans des films minces de 150 nm d'Au texturé. En appliquant la méthode de la "largeur intégrale" connue et employée dans les matériaux massifs, nous avons montré sa faisabilité et son intérêt dans le cas de couches minces. Ainsi, en relation avec la méthode de mesure des contraintes par diffraction des rayons X, elle a permis de mettre en évidence des effets importants des conditions opératoires sur la microstructure des films....

  17. Le développement humain local dans les contextes de crise permanente : l’expérience des femmes au Sahara Occidental

    Directory of Open Access Journals (Sweden)

    María López Belloso

    2009-04-01

    Full Text Available Les femmes sahraouies sont des agents actifs dans la dynamique sociale des camps de réfugiés, au sein desquels elles ont défini un certain nombre de stratégies de résolution de problèmes pour surmonter les obstacles liés à une situation humanitaire qui se détériore. Depuis le début du conflit et le déplacement forcé à Tindouf, en Algérie, les femmes sont en e%et intégralement responsables de la gestion des camps de réfugiés, et ont assumé un rôle de dirigeantes dans de nombreux secteurs de la société. Cet article souligne la contribution des femmes sahraouies au processus de développement humain local dans un contexte de refuge prolongé tel celui que connaît le Sahara Occidental. En plus d’améliorer la capacité d’accès des réfugiés aux ressources matérielles, physiques, sociales et organisationnelles ainsi qu’aux forces motivationnelles, les femmes sahraouies ont été en mesure de mettre en place leur propre processus de renforcement des capacitésII individuelle et collective dans la vie du camp.

  18. 2011-2015 National action plan for the management of radon-related risk; Plan national d'actions 2011-2015 pour la gestion du risque lie au radon

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2011-11-15

    After an assessment of the 2005-2008 action plan, this report presents the 2011-2015 plan. It comprises five main axis: the implementation of a policy regarding the management of the radon-related risk in existing dwellings, the implementation of a regulation for new dwellings, the follow-up of the regulation regarding public places and that applicable to workers, the development and the implementation of new management tools for the diagnosis of buildings and works performed by professionals, and the coordination of policy regarding investigation and research. Each axis comprises several actions which are defined and presented. Eight key measures are also defined

  19. Environnement alimentaire de la vente au détail et expériences de magasinage dans les collectivités des Premières nations du nord des provinces

    Directory of Open Access Journals (Sweden)

    Kristin Burnett

    2017-01-01

    Full Text Available Introduction : Cet article porte sur l'environnement de la vente d’aliments dans les collectivités des Premières nations du nord des provinces, en particulier sur la concurrence éventuelle dans la vente au détail de la North West Company (NWC ainsi que sur les expériences d'achats alimentaires de la population vivant dans le Nord canadien. Méthodologie : Nous avons utilisé deux méthodologies pour évaluer l’environnement alimentaire de la vente au détail dans le Nord. D’abord, nous avons cartographié les détaillants en alimentation du Nord afin d’examiner le degré de concurrence au détail dans les régions nordiques, en prêtant une attention particulière aux collectivités qui ne sont pas accessibles à l’année par la route. Ensuite, nous avons enquêté auprès des personnes vivant dans les collectivités du Nord canadien à propos de leurs expériences d’achat au détail et de magasinage. Résultats : Cinquante‑quatre pour cent des collectivités du nord des provinces et du Grand Nord n’avaient aucune épicerie en concurrence avec la NWC. Les provinces comptant les plus fortes proportions de collectivités nordiques sans concurrence dans la vente au détail étaient l’Ontario (87 %, la Saskatchewan (83 % et le Manitoba (72 %. Les participants au sondage (n = 92 ont fait état de leurs préoccupations quant à leurs expériences d'achat dans trois grands secteurs : le coût des aliments, la qualité et la fraîcheur des aliments et la disponibilité de certains aliments. Conclusion : La concurrence dans la vente au détail est limitée dans le nord des provinces. Au Manitoba, en Saskatchewan et en Ontario, la NWC ne fait face à aucune concurrence dans au moins 70 % des collectivités nordiques. Les consommateurs du Nord canadien considèrent que les aliments nutritifs sont peu abordables, et ils souhaitent avoir accès à un plus grand choix d’aliments périssables en bon état.

  20. Risque de réémergence du paludisme au Maroc Étude de la capacité vectorielle d’Anopheles labranchiae dans une zone rizicole au nord du pays

    Directory of Open Access Journals (Sweden)

    Faraj C.

    2008-12-01

    Full Text Available Dans le but d’estimer le risque de réintroduction du paludisme au Maroc, nous avons analysé le potentiel paludogène d’une zone rizicole au nord du pays. Nos résultats ont montré que la capacité vectorielle d’An. labranchiae, vecteur du paludisme au Maroc, était particulièrement élevée pendant la période estivale qui correspond à la période de culture du riz. Le risque d’une reprise de la transmission du paludisme autochtone est élevé du fait de l’éventuelle présence de porteurs de parasite dans le dernier foyer de paludisme limitrophe de la zone d’étude. Le risque d’une introduction du paludisme tropical est faible, vu la faible vulnérabilité de la région et la compétence de ses vecteurs, considérée comme faible. Toutefois, ce risque doit faire l’objet d’une grande attention.

  1. Gestion par projets et risques pour la santé psychologique au travail dans la nouvelle économie

    Directory of Open Access Journals (Sweden)

    Marie-Josée Legault

    2006-05-01

    Full Text Available Y a-t-il des problèmes de santé mentale propres au travail dans la nouvelle économie ? Quoiqu’on puisse constater que le modèle de demande psychologique - autonomie décisionnelle de Karasek et Theorell- trouve aussi son application dans les milieux de travail qui empruntent cette forme, on observe, en fait, des formes particulières de ces facteurs dans la forme d’organisation du travail propre à la gestion par projets. Assimilables à « l’hypersollicitation par le client » comme il a été repéré par Christophe Dejours, ces formes ont été observées lors d’une enquête menée récemment sur la conciliation entre la vie privée et la vie professionnelle dans sept organisations montréalaises. La recherche qualitative a recueilli en tout le discours de 88 répondants distribués également selon le sexe et exerçant des fonctions liées au génie informatique. Ces observations permettent d’envisager une nuance au modèle théorique de la santé mentale ci-haut mentionné, visant à tenir compte des effets délétères d’une très grande latitude décisionnelle assortie de très grandes responsabilités chez des travailleurs hautement qualifiés.Are there distinct mental health problems among workers in the new economy? Although we may observe that the psychological demand - decision latitude model of Karakek and Theorell is appropriate and also finds its application in this type of workplace, we also notice some particular forms that these factors take in the management-by-project work organization model. Akin to the so-called "client’s hyper-demanding activity" as identified by Christophe Dejours, these forms were observed during a recent field study about balancing work and family in seven Montreal organizations. The qualitative study collected data from 88 individual interviews of information technology engineers, evenly distributed by gender. These observations allow a nuance of the above-mentioned theoretical

  2. Transport de particules massives dans un fluide turbulent: Application a l'erosion due au sable sur les parois d'une turbine hydraulique

    Science.gov (United States)

    Bergeron, Stephen

    Le transport de particules massives par un champ turbulent est un vaste domaine de la mécanique des fluides. Il possède de nombreuses applications comme par exemple le transport de sable dans une turbine hydraulique. En raison de la dureté des grains de quartz et des grandes vitesses de collision avec les parois métalliques, un phénomène d'érosion intensif se produit. Les dommages résultants peuvent diminuer le rendement de la turbine au cours des quelques mois suivant la mise en opération. L'objectif de cette thèse est de mettre au point un outil permettant de prédire ces zones d'érosion. Ce projet de recherche en contexte industriel a été réalisé en collaboration avec la compagnie General Electric Hydro du Canada. Dans un régime hautement turbulent, il est possible d'obtenir une expression suffisamment générale en utilisant une formulation partiellement empirique: l'équation de Basset- Boussinesq-Oseen modifiée. Ce choix de modèle tient compte du niveau de précision recherché et de la méthode numérique employée afin de résoudre la phase fluide. Il permet aussi d'éliminer plusieurs ambiguïtés fréquemment rencontrées dans la littérature et implementées dans certains codes commerciaux courants. La formulation mathématique du problème est effectuée dans un espace mixte Euler-Lagrange. Les paramètres dynamiques sont relies au type de particules et à l'intensité de la turbulence. Le code numérique résultant est le plus performant développé à ce jour (août 1998). Les trajectoires de plusieurs centaines de milliers de particules peuvent être simulées et visualisées de manière interactive sur une station de travail (SGI R4K, R8K et R10K). L'utilisateur du logiciel est libre de se déplacer dans l'espace à l'aide d'un environnement similaire a un ``simulateur de vol''. Il peut ainsi analyser les détails du processus d'érosion de même que l'écoulement du fluide dans la turbine. Les zones d'érosion obtenues à l

  3. Collective effects in Au(100-800 AMeV) + Au semi-central collisions; Effets collectifs dans les collisions semi-centrales Au(100-800 AMeV) + Au

    Energy Technology Data Exchange (ETDEWEB)

    Crochet, P.

    1996-04-04

    The present work has been carried out in the framework of the experimental program of the FOPI collaboration. It is devoted to a systematic study of the different forms of collective expansion of nuclear matter in semi-central Au+Au collisions at incident energies ranging from 100 AMeV to 800 AMeV. The aim is to investigate the influence of compressional effects, momentum dependence of the nuclear interaction and nucleon-nucleon cross section on the observed phenomena. Important changes in the reaction mechanisms are evidenced, in particular at low incident energies where one observes, on the one hand, a transition from an enhanced in-plane emission to a preferential out-of-plane emission pattern and, on the other hand, a strong reduction of the directed in-plane component. Experimental results are compared to the predictions of the Quantum Molecular Dynamics (QMD) model for different parametrizations of the nuclear interaction. (author).

  4. Radon reduction

    International Nuclear Information System (INIS)

    Hamilton, M.A.

    1990-01-01

    During a radon gas screening program, elevated levels of radon gas were detected in homes on Mackinac Island, Mich. Six homes on foundations with crawl spaces were selected for a research project aimed at reducing radon gas concentrations, which ranged from 12.9 to 82.3 pCi/l. Using isolation and ventilation techniques, and variations thereof, radon concentrations were reduced to less than 1 pCi/l. This paper reports that these reductions were achieved using 3.5 mil cross laminated or 10 mil high density polyethylene plastic as a barrier without sealing to the foundation or support piers, solid and/or perforated plastic pipe and mechanical fans. Wind turbines were found to be ineffective at reducing concentrations to acceptable levels. Homeowners themselves installed all materials

  5. Le recours aux modeles dans l'enseignement de la biologie au secondaire : Conceptions d'enseignantes et d'enseignants et modes d'utilisation

    Science.gov (United States)

    Varlet, Madeleine

    Le recours aux modeles et a la modelisation est mentionne dans la documentation scientifique comme un moyen de favoriser la mise en oeuvre de pratiques d'enseignement-apprentissage constructivistes pour pallier les difficultes d'apprentissage en sciences. L'etude prealable du rapport des enseignantes et des enseignants aux modeles et a la modelisation est alors pertinente pour comprendre leurs pratiques d'enseignement et identifier des elements dont la prise en compte dans les formations initiale et disciplinaire peut contribuer au developpement d'un enseignement constructiviste des sciences. Plusieurs recherches ont porte sur ces conceptions sans faire de distinction selon les matieres enseignees, telles la physique, la chimie ou la biologie, alors que les modeles ne sont pas forcement utilises ou compris de la meme maniere dans ces differentes disciplines. Notre recherche s'est interessee aux conceptions d'enseignantes et d'enseignants de biologie au secondaire au sujet des modeles scientifiques, de quelques formes de representations de ces modeles ainsi que de leurs modes d'utilisation en classe. Les resultats, que nous avons obtenus au moyen d'une serie d'entrevues semi-dirigees, indiquent que globalement leurs conceptions au sujet des modeles sont compatibles avec celle scientifiquement admise, mais varient quant aux formes de representations des modeles. L'examen de ces conceptions temoigne d'une connaissance limitee des modeles et variable selon la matiere enseignee. Le niveau d'etudes, la formation prealable, l'experience en enseignement et un possible cloisonnement des matieres pourraient expliquer les differentes conceptions identifiees. En outre, des difficultes temporelles, conceptuelles et techniques peuvent freiner leurs tentatives de modelisation avec les eleves. Toutefois, nos resultats accreditent l'hypothese que les conceptions des enseignantes et des enseignants eux-memes au sujet des modeles, de leurs formes de representation et de leur approche

  6. Study of light fragment production in Au + Au collisions at 150 and 400 A.MeV; Etude de la production de fragments legers dans les collisions Au + Au a 150 et 400 A.Me V

    Energy Technology Data Exchange (ETDEWEB)

    Amouroux, V

    1996-12-17

    We study light fragment production in Au + Au collisions at energies between 150 and 400 A.MeV. Experimental data are extracted from Phase I experiments performed with the FOPI detector at GSI-Darmstadt. We first give centrality criteria and the method used in order to have an evaluation of the impact parameter; that permit comparison between experiment and IQMD or FREESCO models. A first study concerns charge distributions and the reduced variance {gamma}{sub 2}. We observe that the amplitude of the reduced variance decreases rapidly as the centrality of the collision increases; this last point shows that there is no liquid-gas phase transition in central collisions. Such a conclusion agrees with theoretical studies made by the Nantes group concerning fragment formation. A second part concerns a systematic study of differential cross sections of fragment production. We show that IQMD model gives a good qualitative agreement with experimental data; nevertheless, charge distributions are not correctly reproduced by theory. A study of the parameter which fix the width of the Gaussian associated with the nucleons of the interacting system can improve the shape of the charge distributions. Finally, we give at the end of the thesis a systematic presentation of experimental invariant cross sections of fragment production. (author) 80 refs.

  7. Contribution des hôpitaux de jour en psychiatrie dans le champ contemporain de la santé mentale au Québec

    OpenAIRE

    Poirel, Marie-Laurence; Khoury, Emmanuelle; Rodriguez, Lourdes; Larivière, Nadine; Riendeau-Janvier, Catherine

    2013-01-01

    Actuellement au Québec, les hôpitaux de jour en psychiatrie sont des milieux de jour offrant un programme thérapeutique intensif de courte durée, principalement dans un contexte d'activités de groupe. Alors que les hôpitaux de jour sont des acteurs qui font partie intégrante du système de soins en santé mentale depuis plusieurs décennies, la question de leur rôle et de leur contribution spécifique dans le champ des approches et des pratiques de traitement et pour les personnes qu'ils rejoigne...

  8. Ancrage au sol et (nouvelles) mobilités dans l’espace saharo-sahélien : des expériences similaires et compatibles

    OpenAIRE

    Grémont, Charles

    2013-01-01

    Depuis les années 1980, les populations dites « nomades » des régions nord du Mali et du Niger ont engagé un vaste processus d’ancrage au sol. Elles habitent aujourd’hui majoritairement dans des villages ou des « sites de fixation ». Mais dans le même temps, des individus et des petits groupes parmi ces mêmes populations, ont considérablement élargi leurs espaces de mobilité et accéléré le rythme et la valeur des échanges auxquels ils participent. Ces deux phénomènes pourraient, à première vu...

  9. Séroprévalence et facteurs associés au VIH et aux hépatites virales B et C dans la ville de Bafoussam au Cameroun

    Science.gov (United States)

    Mbopi-Keou, Francois-Xavier; Nkala, Isabelle Vanessa Monthe; Kalla, Ginette Claude Mireille; Nguefack-Tsague, Georges; Kamga, Hortense Gonsu; Noubom, Michel; Mvogo, Côme Ebana; Sosso, Maurice Aurelien

    2015-01-01

    Introduction L'objectif de ce travail était de déterminer la séroprévalence et les facteurs associés au VIH et aux hépatites virales B et C dans la ville de Bafoussam au Cameroun. Méthodes Il s'agissait d'une étude descriptive et analytique réalisée de février 2012 à Juin 2012 dans la ville de Bafoussam au Cameroun. Pour cette étude, nous avons obtenu une clairance éthique. Résultats Au total, 982 personnes ont été dépistées pour le VIH et les hépatites virales B et C. Les femmes représentaient 56,3% des personnes dépistées. La tranche d’âge la plus représentée était celle des 20 à 24 ans. L’âge médian était de 34,5 ans. Les prévalences du VIH, de l'AgHBs, et de l'Ac anti HCV étaient respectivement de 6,0%, 4,1%, et 0,4%. La prévalence du VIH était 2 fois plus élevée parmi les femmes que les hommes avec 8,1% contre 3,5% (p=0,01). Les prévalences les plus élevées ont été observées chez les personnes de 30 à 34 ans, 40 à 44 ans avec 15,0% et 11,5% (p=0,01), les personnes sans emploi avec 11,1% (pVIH n’était pas directement liée aux comportements et pratiques sexuels de la population de l’étude. On enregistrait une prévalence élevée de 29,3% chez les individus ayant déclaré avoir au moins une infection sexuellement transmissible (p=0,000). Conclusion Il apparait urgent de mettre en place des stratégies de prévention contre le VIH, les hépatites virales et les facteurs associés au Cameroun. PMID:26113899

  10. Impact de la taille sur le contenu des tableaux de bord dans les entreprises au Maroc : résultats d'une étude empirique

    OpenAIRE

    Azzouz Elhamma

    2011-01-01

    From the results of an empirical research, this article examines the impact of the size on the performance measurement systems of the 62 Moroccan firms. The principal results of this research show that the increasing firm size is identified as factor which tends to foster a more balanced approach.; À partir des résultats d'une recherche empirique, cet article examine l'impact de la taille sur la différenciation des indicateurs intégrés dans les tableaux de bord de 62 entreprises installées au...

  11. Le théâtre dans la formation oratoire des écoliers au XVIe siècle

    NARCIS (Netherlands)

    Lavéant, K.

    2012-01-01

    On a longtemps ignoré la place du théâtre comme outil pédagogique et didactique dans les petites et grandes écoles aux XVe et XVIe siècles, et le rôle des pratiques dramatiques dans la formation des jeunes gens dans un contexte plus large de sociabilité urbaine. Or on peut analyser ces deux

  12. Radon detection

    Science.gov (United States)

    MacArthur, D.W.; Allander, K.S.; Bounds, J.A.

    1994-01-25

    A detector for atmospheric radon using a long range alpha detector as its sensing element is described. An electrostatic filter removes ions from ambient air, while allowing radon atoms to pass into a decay cavity. Here, radon atoms are allowed to decay, creating air ions. These air ions are drawn by a fan through a second electrostatic filter which can be activated or deactivated, and into the long range alpha detector. With the second electrostatic filter activated, no air ions are allowed to pass, and the signal output from the long range alpha detector consists of only the electronic background. With the second electrostatic filter deactivated, air ions and cosmic rays will be detected. The cosmic ray contribution can be minimized by shielding. 3 figures.

  13. Scopingreport radon

    International Nuclear Information System (INIS)

    Blaauboer, R.O.; Vaas, L.H.; Hesse, J.M.; Slooff, W.

    1989-09-01

    This report contains general information on radon concerning the existing standards, sources and emissions, the exposure levels and effect levels. lt serves as a basis for the discussion during the exploratory melting to be held in November/December 1989, aimed at determining the contents of the Integrated Criteria Document Radon. Attention is focussd on Rn-222 (radon) and Rn-220 (thoron), presently of public interest because of radon gas pollution in private homes. In the Netherlands air quality standards nor product standards for the exhalation rate of building materials have been recommended. The major source of radon in the Netherlands is the soil gas (> 97%), minor sources are phosphate residues and building materials (> 2% in total). Hence, the major concern is the transfer through the inhalation of air, the lung being the most critical organ at risk to develop cancer. Compared to risks for humans, the risks of radon and its daughters for aquatic and terrestric organisms, as well as for agricultural crops and livestock, are assumed to be limited. In the Netherlands the average dose for man due to radon and thoron progeny is appr. 1.2 mSv per year, the estimated dose range being 0.1-3.5 mSv per year. This dose contributes for about 50% to rhe total exposure due to all sources of ionizing radiation. Of this dose respectively 80% is caused by radon and about 90% is received indoor. The estimated dose for the general population corresponds to a risk for inducing fatal cancers of about 15 x 10-6 per year, ranging from 1.2 x 10-6 to 44 x 10-6 which exceeds the risk limit of 1 x 10-6 per year -as defined in the standardization policy in the Netherlands for a single source of ionizing radiation-with a factor 15 (1- 44). Reduction of exposure is only possible in the indoor environment. Several techniques have been described to reduce the indoor dose, resulting from exhalation of the soil and building materials. )aut- hor). 37 refs.; 3 figs.; 8 tabs

  14. Genre et dynamique organisationnelle au Moyen Atlas : cas du douar Maâmar dans la région de Khénifra

    Directory of Open Access Journals (Sweden)

    Fatima Zahid

    2014-03-01

    Full Text Available Le droit au développement semble animer tous les efforts visant à promouvoir la montagne marocaine, dans toutes ses dimensions politiques, sociales, organisationnelles à travers des projets de développement dont le plus réputé au Moyen Atlas est le projet MEDA-Khénifra. Ses actions diverses et ambitieuses ont façonné un douar de la région par de nouvelles organisations qui ont impacté les relations sociales et en particulier les relations du genre. Nous analysons à travers ce cas l’impact des projets de développement sur les relations du genre et l’empowerment des femmes dans cet espace. Les enquêtes ont été menées sous forme de questionnaires et d’entretiens collectifs. Le projet a créé deux organisations formelles : une association de développement et une coopérative pour la valorisation des plantes aromatiques et médicinales. Les femmes n’ont pas été impliquées dans ces organisations et certaines d’entre elles ont été invitées à participer à deux groupements informels. Le premier, pour la production de plantes aromatiques et médicinales, est resté sous la tutelle des organisations formelles gérées par les hommes. L’autre, dédié à l’apiculture, est plus autonome et a mieux réussi. Par ailleurs, la montée en puissance des organisations formelles a conduit à une moindre capacité d’action des femmes au niveau du village, car elles n’ont plus sur ces organisations les droits qu’elles ont traditionnellement dans le cadre de la jmâa. Cette expérience montre qu’un projet de développement peut influencer négativement les relations de genre malgré les bonnes volontés. La réflexion sur la question de genre doit alors impérativement animer l’ensemble des actions des projets de développement.

  15. Managing Radon in Schools

    Science.gov (United States)

    EPA recommends testing all schools for radon. As part of an effective IAQ management program, schools can take simple steps to test for radon and reduce risks to occupants if high radon levels are found.

  16. Relation between "terra rossa" from the Apulia aquifer of Italy and the radon content of groundwater: Experimental results and their applicability to radon occurrence in the aquifer

    Science.gov (United States)

    Tadolini, T.; Spizzico, M.

    The radon-222 (222Rn) activity in groundwater of the Apulian karstic aquifer in southern Italy is as great as 500 Becquerel per liter (Bq/L) locally. Normal radium-226 (226Ra) activity in the limestone and calcareous dolomites of the aquifer is not enough to explain such a high level. Laboratory investigations identified high 226Ra activity in the "terra rossa," the residuum occupying fissures and cavities in the bedrock, and also the relation between (1) 226Ra-bearing bedrock and "terra rossa" and (2) 222Rn in water. The "terra rossa" is the primary source of the radon in the groundwater. The experimental results show the need to characterize the "terra rossa" of Apulia on the basis of 226Ra activity and also to study the distribution and variations in 222Rn activity over time in the aquifer. Résumé L'activité du radon-222 (222Rn) dans les eaux souterraines de l'aquifère karstique des Pouilles, dans le sud de l'Italie, atteint localement 500 Becquerel par litre (Bq/L). L'activité normale du radium-226 (226Ra) dans les calcaires et dans les calcaires dolomitiques de l'aquifère n'est pas assez élevée pour expliquer des valeurs aussi élevées. Des analyses de laboratoire ont mis en évidence une forte activité en 226Ra dans la terra rossa, remplissage de fissures et de cavités de la roche, ainsi qu'une relation entre (1) la roche et la terra rossa contenant du 226Ra et (2) le 222Rn dans l'eau. La terra rossa est la source primaire de radon dans l'eau souterraine. Les résultats expérimentaux montrent qu'il est nécessaire de caractériser la terra rossa des Pouilles par son activité en 226Ra et d'étudier la distribution et les variations de l'activité en 222Rn au cours du temps dans l'aquifère. Resumen La actividad del radon-222 (222Rn) en el agua subterránea del acuífero cárstico de Apulia, al sur de Italia, alcanza localmente los 500Bq/L. La actividad normal del radio-226 (226Ra) en las calcitas y dolomitas del acuífero no es suficiente para

  17. Production of {lambda}(1520) in p+p and Au+Au collisions with {radical}s{sub NN} = 200 GeV in the STAR experiment at RHIC; Production de {lambda}(1520) dans les collisions p+p et Au+Au a {radical}s{sub NN} = 200 GeV dans l'experience STAR au RHIC

    Energy Technology Data Exchange (ETDEWEB)

    Gaudichet, L

    2003-10-01

    Ultra-relativistic heavy ion collisions are produced in order to observe the created hot and dense matter. One major goal is to probe the existence of the Quark Gluon Plasma (QGP). The QGP would be the state of matter in which temperature and density are high enough to break the quark confinement into hadrons. For that purpose, the RHIC collider has produced p+p and Au+Au collisions at the energy of {radical}s{sub NN}= 200 GeV. This thesis work is focused on the production of {lambda}(1520) resonances in these collisions with the STAR experiment. In comparison with statistical prediction, the measured {lambda}(1520)/{lambda} show a significant lowering in ultra-relativistic heavy ion collisions. These results strongly support the decoupling of the system in two stages: a chemical freeze-out followed by a thermal freeze-out. This conclusion constitutes an important step to an understanding of the created matter in high energy heavy ion collisions. (author)

  18. Transient Pressure Surges Due to Pipe Movement in an Oil Well Surpressions transitoires dues au mouvement des colonnes de tubes dans les puits.

    Directory of Open Access Journals (Sweden)

    Lubinski A.

    2006-11-01

    Full Text Available A pressure surge which could cause lost circulation, results from running a stand of drill pipe or a joint of casing into a hole. Similarly, a negative pressure surge, which could cause a blowout, results from pulling pipe from a hole. In past investigations, pressure surges were calculated on the basis of steady state flow. It is shown in this paper that this led to erroneous results. In thls investigation, pressure surges are calculated on the basis of transient wave propagation phenomena. A computer program was developed to that effect. Results are presented in :the first part of the paper, and the mathematics in the second. La descente d'une longueur de tiges ou d'un tube de casing dans le trou provoque une surpression pouvant entraîner des pertes de circulation. De même, la remontée des tiges provoque une surpression négative pouvant entraîner une éruption. Au cours des précédentes recherches, les surpressions étaient calculées pour des débits en régime permanent. Il est montré dans cet étude que les résultats ainsi obtenus ne sont pas exacts. Dans cette recherche, les calculs des surpressions sont basés sur le phénomène de propagation transitoire des ondes. Un programme de calcul sur ordinateur a été développé à cet effet. Les résultats sont présentés dans la première partie de cet article et les calculs font l'objet de la deuxième partie.

  19. Projet de recherches palynologiques au Pérou dans le cadre de la préservation de la nature

    Directory of Open Access Journals (Sweden)

    1974-01-01

    Full Text Available Ce rapport ne prétend pas constituer un travail original, mais se présente plutôt comme une définition de la palynologie mettant en évidence la relation qui existe entre cette science et la conservation des richesses naturelles. L'application des méthodes palynologiques permet de connaître avec une assez grande précision la végétation qui existait il a 10 000 ou 15 000 ans. Grâce à l'étude du pollen il est possible d'obtenir des informations sur les différents types d'adaptation de la végétation, et, par conséquent, de déterminer les associations végétales les mieux adaptées au milieu naturel. Connaître la végétation actuelle et la comparer avec celle des époques antérieures met en évidence l'influence des variations climatiques récentes, ainsi que celle de l'homme, sur la végétation. Le programme ébauché ici se propose de préparer, à partir des études effectuées sur la végétation postérieure à la dernière période glaciaire, la reconstitution de la couverture végétale de la sierra centrale du Pérou, dans le but d'assurer la conservation du sol, des eaux et de la faune sauvage. El presente informe no pretende ser un trabajo original sino una definición de la palinología, estableciendo el nexo que existe entre esta ciencia y la conservación de la naturaleza . La aplicación de métodos palinológicos permite conocer con bastante precisión la vegetación que existió hace 10,000 ó 15,000 años. El estudio del polen hace posible contar con información sobre los diversos tipos de adaptación de la vegetación, lo que permitirá determinar las asociaciones vegetales más convenientes, en concordancia con el medio ambiente. El conocimiento de la vegetación actual y su comparación con la de épocas anteriores da una idea sobre la influencia de las últimas variaciones climáticas y del hombre Con el proyecto que se esboza se propone, en base a los estudios de la vegetación posterior al último per

  20. Mechanisms of radon injury

    International Nuclear Information System (INIS)

    Cross, F.T.

    1988-01-01

    In this new project, they conduct molecular, cellular and whole-animal research relevant to understanding the inhalation toxicology of radon and radon-daughter exposures. The work specifically addresses the exposure-rate effect in radon-daughter carcinogenesis; the induction-promotion relationships associated with exposure to radon and cigarette-smoke mixtures; the role of oncogenes in radon-induced cancers; the effects of radon on DNA as well as on DNA repair processes; and the involvement of growth factors and their receptors in radon-induced carcinogenesis. Preliminary experiments showed that oncogenes are activated in radon-induced lung tumors. They have therefore begun further exposures pertinent to the oncogene and growth-factor studies. An in vitro radon cellular-exposure system was designed, and cell exposures were initiated. Initiation-promotion-initiation studies with radon and cigarette-smoke mixtures have also begun; and they are compiling a radon health-effects bibliography

  1. Mesure de la Polarisation des Lambda Produits dans les Collisions Positron-Electron AU Lep a L'aide du Detecteur Opal

    Science.gov (United States)

    Vandenplas, Denis

    Le Modele Standard est le cadre theorique general qui, jusqu'a present, a permis l'interpretation de tous les resultats experimentaux en physique des hautes energies. Cette theorie decrit, entre autres, la production d'une paire de particules elementaires, formee d'un quark et d'un antiquark, a partir de la desintegration de l'un des bosons mediateurs de l'interaction faible, le Z^0. Cependant, dans ce cas precis, la transformation subsequente des quarks primaires en particules reelles, un processus appele hadronisation, n'est decrite qu'a l'aide de modeles phenomenologiques. Afin de sonder les mecanismes de l'hadronisation, cette these presente la mesure du transfert du spin d'un quark etrange primaire a une particule appelee Lambda lors des desintegrations hadroniques du Z^0. L'etude a ete realisee dans le cadre de la collaboration OPAL, une des quatre experiences menees au collisionneur LEP, la ou des electrons et des positrons sont acceleres jusqu'a une energie commune, sqrt{s} = {rm E_ {cm}}, voisine de l'energie de production du rm Z^0, M_{Z ^0} egale a 91.3 GeV. La theorie electrofaible precise la direction du spin, c'est-a-dire la polarisation, d'un quark etrange primaire provenant de la desintegration d'un Z ^0. Quant a lui, le modele des quarks etablit que l'orientation du spin d'un Lambda est directement reliee a la polarisation du quark etrange dont il provient. La question est de determiner dans quelle mesure la polarisation du quark primaire est transmise au Lambda a la suite du processus de l'hadronisation, decrit dans le cadre de la ChromoDynamique Quantique. Une estimation, qui tient compte de tous ces differents aspects theoriques, evalue a 30% la polarisation des Lambda dont l'impulsion est superieure a 15 GeV/c. La mesure experimentale de la polarisation repose sur l'identification des Lambda a partir de la reconstitution de la desintegration Lambdato ppi^-. Ce processus, qui se deroule par le biais de l'interaction faible, viole la parite car

  2. The Norwegian information campaign on radon

    International Nuclear Information System (INIS)

    Thommesen, G.; Strand, T.

    1999-01-01

    The responsibility for providing an overview of 'all factors in the environment which are or may be having a direct or indirect influence on the health - -' rests with the municipal health authorities. In order to enable the municipal staff throughout Norway to accomplish local radon surveys, an information campaign on radon, including printed information material and training courses, was carried out in 1998-99, primarily directed towards municipal civil servants. The two-day training courses comprised of lectures and a compendium covering basic knowledge on ionizing radiation, sources of radon, measurement techniques, health risk, prophylactic and remedial measures, design and accomplishment of survey projects, and information strategy. The printed information material includes booklets providing general information on radon (health risks, measurements, and mitigation), methods for measuring radon in indoor air and construction sites, action levels, and design of municipal radon surveys. Two posters have been issued, one mainly intended for public offices and waiting rooms to motivate the public for radon measurements, the other one intended for municipal personnel and governmental offices, the latter also issued as a collection of fact sheets intended for schools etc. the booklets are displayed on the Internet (www.nrpa.no). The site also contains links to further information on mitigation techniques and economic support to remedial measures. (au)

  3. The radon transform. Theory and implementation

    International Nuclear Information System (INIS)

    Toft, P.

    1996-01-01

    The subject of this Ph.D. thesis is the mathematical Radon transform, which is well suited for curve detection in digital images, and for reconstruction of tomography images. The thesis is divided into two main parts. Part I describes the Radon- and the Hough-transform and especially their discrete approximations with respect to curve parameter detection in digital images. The sampling relationships of the Radon transform is reviewed from a digital signal processing point of view. The discrete Radon transform is investigated for detection of curves, and aspects regarding the performance of the Radon transform assuming various types of noise is covered. Furthermore, a new fast scheme for estimating curve parameters is presented. Part II of the thesis describes the inverse Radon transform in 2D and 3D with focus on reconstruction of tomography images. Some of the direct reconstruction schemes are analyzed, including their discrete implementation. Furthermore, several iterative reconstruction schemes based on linear algebra are reviewed and applied for reconstruction of Positron Emission Tomography (PET) images. A new and very fast implementation of 2D iterative reconstruction methods is devised. In a more practical oriented chapter, the noise in PET images is modelled from a very large number of measurements. Several packagers for Radon- and Hough-transform based curve detection and direct/iterative 2D and 3D reconstruction have been developed and provided for free. (au) 140 refs

  4. BGS Radon Protective Measures GIS

    International Nuclear Information System (INIS)

    Appleton, D.; Adlam, K.

    2000-01-01

    The British Geological Survey Radon Protective Measures Geographical Information System is described. The following issues are highlighted: Identification of development sites where radon protection is required in new dwellings; Mapping radon potential on the basis of house radon and geology; Radon Protective Measures GIS; Radon site reports; and Follow-up radon protective measures sire reports

  5. Développement intégré, gestion des risques et adaptation communautaire au changement climatique dans un système montagne-plaine au nord de la Tanzanie

    Directory of Open Access Journals (Sweden)

    Ben Wisner

    2012-04-01

    Full Text Available Cet article présente une analyse préliminaire d’un travail mené le long des pentes des montagnes et dans les plaines du nord de la Tanzanie. Un fort degré d’interdépendance a pu être mis en évidence parmi des groupes d’individus de langues et de cultures différentes, de statuts socio-économiques variés. Leurs interactions se situent le long de gradients environnementaux allant de l’amont à l’aval. On désignera cela « adaptation socio-géographique » au changement climatique. Cependant, l’analyse et la discussion présentées ajoutent la complexité à n’importe quelle notion simpliste « d’adaptation au changement climatique » puisque les changements sont multiples et l’adaptation, de fait, reste complexe.

  6. Facteurs de risque de l'infection par le VIH dans le district de santé de Meyomessala au Cameroun

    Science.gov (United States)

    Mbopi-Keou, Francois-Xavier; Nguefack-Tsague, Georges; Kalla, Ginette Claude Mireille; Abessolo, Stéphanie Abo'o; Angwafo, Fru; Muna, Walinjom

    2014-01-01

    Introduction L'objectif de ce travail était de déterminer les facteurs de risque de l'infection par le VIH dans le district de santé de Meyomessala (Région du Sud) au Cameroun. Méthodes Il s'agissait d'une étude transversale, descriptive et analytique qui s'est déroulée de Février à Mai 2011. Pour cette étude, nous avons obtenu une clairance éthique. Résultats L’échantillon était constitué de 315 participants dont 181 (57,46%) hommes et 134 (42,54%) femmes. L’âge moyen était de 24,5±8ans (extrême: 15-45ans). Quarante personnes (40) étaient séropositifs, soit une prévalence de l'infection par le VIH de 12,7%. Cette prévalence augmentait significativement (p = 0) avec le nombre de partenaires occasionnels au cours des douze derniers mois, allant de 2,7% chez ceux n'ayant eu aucun partenaire occasionnel à 21,25% chez ceux ayant plus de trois partenaires occasionnels (RC = 9,72; IC = 1,27-74,14; P = 0,03). le fait d’être âgé entre 20 et 24 ans (RC = 4,88; IC = 1,74-13,67; p = 0), avoir plus de trois partenaires sexuels au cours des douze derniers mois (RC = 9,72; IC = 1,27-74,14; p = 0,03), avoir les rapports sexuels avec les prostitués (RC = 2,86; IC = 1,42-5,76; p = 0), avoir eu le chlamydia (RC = 3,00; IC = 1,07-8,39; p = 0,04), avoir eu la syphilis (RC = 3,35; IC = 1,57-7,14; p = 0), avoir des avantages sociaux lors du premier rapport sexuel (RC = 2,57; IC = 1,03-6,43; p = 0,04) constituaient des potentiels facteurs de risque du VIH. Conclusion Il apparait urgent d'intensifier les campagnes de sensibilisation au risque d'infection par le VIH et les maladies sexuellement transmissibles dans le district de santé de Meyomessala PMID:25419299

  7. Faible taux de succès du sevrage tabagique à court et moyen termes au décours d'un infarctus aigu du myocarde dans un service de cardiologie de Dakar au Sénégal

    Science.gov (United States)

    Mbaye, Alassane; Diop, Adja Mariétou; Dioum, Momar; Bodian, Malick; Ndiaye, Mouhamadou Bamba; Kane, Adama; Yaméogo, Nobila Valentin; Diao, Maboury; Ba, Oumar; Kane, Abdoul

    2011-01-01

    Introduction Le tabagisme est un puissant facteur de risque cardio-vasculaire. Son sevrage semble moins bien pris en compte chez les coronariens. Les objectifs de ce travail étaient d’évaluer la prévalence du tabagisme et le sevrage tabagique au décours d'un infarctus du myocarde dans un service de cardiologie au Sénégal. Méthodes Il s'agit d'une étude transversale et descriptive réalisée entre janvier 2008 et juin 2010. Nous avons recruté les patients hospitalisés pour infarctus du myocarde puis les fumeurs actifs ont été inclus dans notre enquête. Les malades étaient sensibilisés pour l'arrêt du tabac puis suivis à 3 mois, 6 mois et 12 mois pour évaluer le sevrage tabagique. Résultats Nous avons recensé 82 patients hospitalisés pour un infarctus du myocarde, parmi eux 26 sujets (25 hommes) étaient fumeurs (31,7%). L’âge moyen des sujets fumeurs était de 56±11,5 ans. La consommation moyenne de tabac était de 32±14 paquets-année et le score moyen de Fagerström de 8. Tous les patients ont arrêté le tabac pendant l'hospitalisation. Après un suivi de 3 mois, 45% des patients ont repris le tabac, 65% à 6 mois et 85% à 12 mois. Conclusion Le tabagisme est assez fréquent chez les patients sénégalais présentant un infarctus du myocarde. Le taux de sevrage tabagique à court et moyen termes est faible. Le sevrage tabagique devrait alors constituer un objectif privilégié dans la prévention des maladies cardio-vasculaires. PMID:22187601

  8. Radon: Not so Noble

    Indian Academy of Sciences (India)

    water supplies. Uranium miners and residents of houses built on uranium bearing rocks or soils are exposed to high concentrations of radon. Continuous exposure to radon causes lung cancer in human beings. Chemistry of Radon ..... physical state, and low solubility in the body fluid, radon itself does not pose much of a ...

  9. Le pouvoir des mythes dans la société française postmoderne : des créatifs au social, du social au mythe

    Directory of Open Access Journals (Sweden)

    Françoise Piot-Tricoire

    2013-07-01

    Full Text Available La méthodologie consiste à réunir et analyser un corpus de textes, d’images, de discours qui s’imposent dans la société française actuelle, issu d’acteurs qui constituent l’élite créative de la société : tendanceurs de mode, artistes, créatifs, mais aussi d’actions et de discours citoyens. Les artistes « matérialisent l’impalpable esprit environnant » . Ainsi partagent-ils une même communauté d’esprits, de valeurs et d’imaginaires avec l’ensemble de la population et expriment par leur capacité créative les ruissellements imaginales de la société.

  10. Une nouvelle étape dans la lutte contre le sida au Chili. Construire une politique globale de prévention

    OpenAIRE

    Fregosi, Renée

    2013-01-01

    Le Chili, pays relativement peu touché par le VIH (taux de prévalence à 0,3 %) est en pointe dans la lutte contre la maladie. pourtant de véritables problèmes demeurent pour réaliser le saut qualitatif nécessaire pour atteindre l’objectif des trois zéros de l’Onusida. Des obstacles à la prévention demeurent consistants au sein des populations et tout particulièrement parmi les personnes qui ne se considèrent pas a priori comme étant en situation de risque. Comment expliquer qu’après une premi...

  11. Hommage à Gilles Chomer : L’Enfant Jésus retrouvé au Temple, un nouveau Stella dans les Pyrénées

    Directory of Open Access Journals (Sweden)

    Bertrand Ducourau

    2012-04-01

    Full Text Available Figure 1Jacques Stella, L’Enfant Jésus retrouvé au Temple, Saint–Béat, trésor de l’église (dépôt de la municipalité de FosPhot. André Mielniczek © Ministère de la culture, DRAC Midi–Pyrénées, 2000La redécouverte de cette toile séduisante, mise en dépôt dans le trésor de l’église de Saint–Béat (Haute–Garonne par la municipalité de Fos, ajoute une nouvelle version à un groupe de peintures dérivant toutes du chef-d'œuvre de Jacques Stella (1596–1657, peint vers 1642 pour le noviciat des jésui...

  12. Formes et éthiques de la réification dans la « nouvelle‑tableau » au Yémen

    Directory of Open Access Journals (Sweden)

    Géraldine Jenvrin

    2010-07-01

    Full Text Available Deux « nouvelles-tableaux » de Mu/hammad ‘Uthmân expriment le désarroi d'une conscience face aux êtres « réifiés ». Elles illustrent l’existence actuelle au Yémen d’une voie novatrice dans la représentation des rapports moi-monde-écriture au sein du cadre narratif de la nouvelle. Alors que Chaises et ombres donne à voir un tableau de type impressionniste jouant sur la déclinaison d’images successives, Trio se fonde sur la figure de la répétition et le génie de la composition. Paradoxalement, dans une exploitation maximale de la dimension spatiale et temporelle propre à la « réification », toutes deux mettent en avant le thème de la frustration et du violent conflit des désirs.Two "picture-short stories" of Mu/hammad 'Uthman express the confusion of a consciousness faced to reified beings. They illustrate the actual existence in Yemen of an innovative approach in the representation of the relashionship between the Self, the world and the writing within the narrative framework of the short story. While the first story reveals a type of impressionistic painting playing on the declination of successive images, the second is based on the figure of repetition and the genius of the composition. Paradoxically, as they maximize the spatial and temporal dimension specific to the reification, both highlight the theme of frustration and of the violent conflict between the desires.

  13. Morale et Religion dans les manuels de français au Portugal au tournant du XIXe siècle1

    OpenAIRE

    Salema, Maria José

    2014-01-01

    1. De nouveaux manuels pour un enseignement moderne des langues vivantes Les manuels d'enseignement de la langue vivante de plus grande diffusion au XIXe siècle, le français, sont l'un des miroirs les plus intéressants des croyances véhiculées par les idéaux éducatifs alors dominants. En effet, ces outils reflètent assez fidèlement l'évolution des publics scolaires, des objectifs et des méthodes d'apprentissage conçus pour répondre aux nouveaux besoins sociaux et éducatifs qui se manifestent ...

  14. Écologie des stomoxes (Diptera : Muscidae au Gabon. I – Premier inventaire dans différentes zones écologiques

    Directory of Open Access Journals (Sweden)

    Mavoungou J.F.

    2008-03-01

    Full Text Available Les stomoxes (Stomoxys spp. sont des diptères hématophages, vecteurs potentiels de divers agents pathogènes. Comme ceux de la région afrotropicale en général, les stomoxes du Gabon demeurent mal connus. Pour ces raisons, une enquête entomologique a été conduite de façon transversale dans huit localités représentatives des diverses zones écologiques du Gabon. L’enquête est basée sur l’utilisation de pièges Vavoua. Divers facteurs environnementaux pouvant influer sur les captures ont été relevés et inclus dans une analyse canonique des correspondances. Au total, 15 966 stomoxes, appartenant à sept espèces ou sous-espèces, ont été capturés. Les densités apparentes (DAP, exprimées en nombre de stomoxes par piège et par jour, sont importantes dans les localités de Franceville (41, Bakoumba (40, Makokou (25 et Mouila (21. Les espèces les plus abondantes sont Stomoxys n. niger (33,4 % de l’ensemble des captures, S. transvittatus (33 % puis S. calcitrans (17 %. Les principaux facteurs qui expliquent la variabilité des captures sont le degré d’anthropisation du milieu, le faciès botanique (savane ou forêt, la présence de la faune sauvage et domestique et la nature de la couverture végétale du sol. S. calcitrans et S. n. niger sont abondants dans les zones où la présence humaine est manifeste. S. xanthomelas est inféodé aux zones forestières. S. transvittatus, S. omega, et S. inornatus sont des espèces ubiquistes. S. niger bilineatus se retrouve dans les zones de savane.

  15. Radon dynamics in underwater thermal radon therapy

    International Nuclear Information System (INIS)

    Lettner, H.; Hofmann, W.; Winkler, R.; Rolle, R.; Foisner, W.

    1998-01-01

    At a facility for underwater thermal radon therapy in Bad Hofgastein, experiments were carried out with the aim of establishing radon in the air exhaled by the treated patients and of radon decay products on the skin of the patients. The time course of radon concentration in the exhaled air shows a maximum a few minutes after entering the bath, then the Rn concentration remains constant over the remaining time spent in the bath. Taking into account several simplifying assumptions, the average dose to the epidermis from radon daughters is about 50 μGy. (A.K.)

  16. Travailler avec Windows 7 au CERN (FR)

    CERN Multimedia

    CERN. Geneva

    2010-01-01

    Vue d'ensemble des nouveaux concepts et des changements dans l'interface utilisateur survenus dans Windows 7 depuis les versions antérieures de Windows (XP ou Vista). La mise à disposition de Windows 7 au CERN et son intégration dans l’infrastructure de Windows au CERN seront présentées.

  17. Nouveaux modes de coordination des acteurs dans le développement local: cas des zones rurales au Bénin

    Directory of Open Access Journals (Sweden)

    Bernard G. Hounmenou

    2003-10-01

    Full Text Available Les politiques de développement en cours dans plusieurs pays du sud, notamment dans ceux de l’Afrique sub-saharienne ont amorcé un nouveau tournant à partir de la fin des années 1980. A la faveur de l’instauration du climat de démocratie dans plusieurs de ces pays à partir de cette période, nombre d’entre eux ont procédé à de profondes réformes, donnant à la société civile et aux populations à la base, un droit de regard plus important dans la conduite des affaires les concernant. L’une des manifestations les plus importantes de ces réformes se traduit par la mise en œuvre de la décentralisation. Ce processus vise entre autres, la prise en compte des réalités locales et la responsabilisation des communautés à la base dans la gestion de leur développement. Il s’agit en d’autres termes, de favoriser le renforcement des capacités des populations locales, en vue de leur permettre de prendre en charge de façon durable, la gestion de leurs propres affaires dans le cadre de la gouvernance participative. Amorcé en janvier 1993, avec les états généraux de l’administration territoriale, le processus de la décentralisation au Bénin n’a connu sa phase de concrétisation qu’avec les élections et l’installation des élus locaux en début 2003. En prélude à l’avènement de la décentralisation, plusieurs localités béninoises font l’objet, depuis le milieu des années 1990, d’expériences d’appui au développement des communautés locales. C’est le cas notamment, des villages des départements de l’Atlantique et des Collines. A travers ces expériences, se mettent en place, divers dispositifs de gouvernance locale au sein des systèmes locaux d’action publique relatifs aux localités rurales. Il s’agit notamment, des comités villageois de suivi ou de gestion, des dispositifs de comités villageois de développement dans le département de l’Atlantique, et du dispositif des projets de

  18. Radon rakentamisessa

    OpenAIRE

    Nevanpää, Juha

    2011-01-01

    Opinnäytetyön tarkoituksena oli tutkia radonin vaikutuksia rakentamisessa, radonin tuottamia terveyshaittoja sekä radoniin liittyviä lainsäädännöllisiä näkökohtia Suomessa. Opinnäytetyön tavoitteena oli selvittää radonturvalliset rakenneratkaisut. Lisäksi opinnäytetyön tavoitteena oli selvittää radonin aktuaalinen esiintyminen kolmessa eri mittauskohteessa Porin ja Tampereen alueella. Radon valittiin tutkimuskohteeksi, sillä radonin huomioiminen rakentamisessa on tärkeää terveyshaittojen e...

  19. Les migrations dans les mondes alpin et jurassien suisses du Moyen Age au milieu du XXe siècle : un bref survol

    Directory of Open Access Journals (Sweden)

    Anne-Lise Head-König

    2011-05-01

    Full Text Available Cette contribution vise à montrer les grandes phases des mouvements migratoires du Moyen Age au milieu du XXe siècle dans les mondes alpin et jurassien suisses. La migration a toujours été une complémentarité nécessaire aux ressources de la montagne, et elle s'amplifie lorsque les disparités économiques avec le plat pays s'accroissent. Elle se caractérise par une forte diversité, puisque non seulement les destinations et les aires d'établissement des migrants peuvent varier fortement d'une commune à l'autre, mais aussi parce qu'au sein d'un même territoire ont toujours coexisté des formes différentes de mobilité, saisonnières, pluriannuelles, viagères ou définitives. Un aspect remarquable de ces types de migration est qu’ils s'inscrivent dans une très longue tradition pluriséculaire, avec quelques exceptions notables, ainsi les migrations des Walser, les migrations forcées et les nouvelles formes de la migration dès la seconde moitié du XIXe siècle. La mobilité est imposée aussi par les modifications des formes prévalantes de production (élevage plutôt qu'emblavures, de même que par les facteurs démographiques. A ces facteurs s'ajoute celui du rôle des institutions politiques tout au long de la période étudiée, seigneuriales au Moyen Age, communales et cantonales jusque dans la seconde moitié du XIXe siècle, puis fédérales.This paper aims at retracing the important phases of migrations in the alpine regions and the Jura from the Middle Ages up to the middle of the 20th century. Migration has always functioned as a necessary complement to the resources of the inhabitants of the upland regions and it increases when the economic disparity with the lowlands becomes more marked. A striking characteristic of such migration is the great diversity that can be observed, since not only the destinations of the migrants varied from community to community, but also different forms of mobility coexisted within the

  20. L'éco-conception dans le génie électrique : application au cas du transformateur

    OpenAIRE

    Debusschere , Vincent; BEN AHMED , Hamid; Multon , Bernard

    2007-01-01

    National audience; Ce papier présente les premiers résultats de la problématique de l'éco-conception dans le cas du plus simple des convertisseurs électromagnétiques : le transformateur monophasé connecté à un réseau à tension et fréquence fixes. L'optimisation de ses dimensions s'obtient par la minimisation de deux objectifs contradictoires, la masse des parties actives et le coût énergétique global sur cycle de vie. Nous comparons dans un premier temps ces résultats d'optimisation à ceux d'...

  1. Séries de problèmes dans une tradition d'enseignement des mathématiques en Hongrie au 20e siècle1

    Directory of Open Access Journals (Sweden)

    Gosztonyi Katalin

    2015-01-01

    Full Text Available Dans cet article, nous discutons l'intérêt d'étudier des « séries de problèmes » pour la caractérisation d'une tradition d'enseignement des mathématiques en Hongrie au 20e siècle. Dans la partie 1, nous résumons le contexte historique et les principes partagés dans cette tradition sur les mathématiques et leur enseignement. Dans la partie 2, nous étudions plus en détail un texte d'un membre de cette communauté, un extrait du Jeux avec l'infini de Rózsa Péter, qui nous servira de modèle pour les analyses ultérieures. Dans la partie 3, nous présentons différents documents liés à la réforme de l'enseignement des mathématiques dirigée par Tamás Varga dans les décennies 1960 et 1970, cette réforme étant considérée comme une étape significative dans l'histoire de cette « tradition hongroise ». Nous tenterons de montrer qu'une réflexion sur la mise en ordre des problèmes joue un rôle crucial dans la structuration de ces textes divers, écrits souvent dans une forme narrative et quasi-littéraire ; et que l'étude des « séries de problèmes » présentées dans ces textes peut apporter une contribution importante à la caractérisation de la tradition en question.

  2. Villages entourés des fosses, abandonnés dans le Sud-Ubangi au ...

    African Journals Online (AJOL)

    Résumé Durant les années 1920-1930, des vestiges de villages entourés de fossés ont été découverts dans le District actuel du Sud-Ubangi. Le territoire couvert par ces anciens villages abandonnés vers le milieu du XIXè siècle (avant l'arrivée des populations actuelles) est assez vaste. Il comprend une bonne partie des ...

  3. Au-delà de la relation « bourreau-victime » dans l’analyse d’une situation de harcèlement psychologique au travail

    Directory of Open Access Journals (Sweden)

    Michel Vézina

    2005-11-01

    Full Text Available Des dispositions législatives ont été adoptées dans plusieurs pays, afin de contrer le harcèlement psychologique au travail. Même s’il est souvent nécessaire, d’un point de vue juridique, que les mesures portent sur la protection individuelle des victimes, on ne peut penser endiguer ce fléau en ne s’appuyant que sur une approche centrée sur l’individu. Aussi, au-delà d’une approche « bourreau-victime » à courte vue, la prévention véritable du harcèlement psychologique au travail passe-t-elle par l’analyse et l’élimination des facteurs organisationnels et des éléments culturels qui constituent un terreau fertile ou propice à l’émergence de comportements violents entre membres d’une même organisation de travail. Ces facteurs sont notamment l’intensification du travail, la faiblesse de l’autorité hiérarchique et la précarisation du lien d’emploi, de même que la banalisation ou la négation du phénomène, la tolérance aux incivilités et l’iniquité ou l’injustice en milieu de travail. À l’instar de la technique de l’arbre des causes utilisée dans l’investigation d’un accident de travail, les intervenants confrontés à une situation de harcèlement psychologique au travail sont invités à adopter une approche qui va au-delà des évidences premières, pour s’attaquer aux causes plus indirectes du phénomène, soit les lacunes dans le système de gestion.Legislation has been adopted in several countries to counter psychological harassment in the workplace. Even if it is often necessary, from a legal standpoint, that the means involve the personal protection of victims, more than a person-centred approach must be considered for stopping this wrong. Also, beyond a « bully-victim » approach, in the short view, real prevention of workplace psychological harassment is achieved by analyzing and eliminating organizational factors and cultural aspects that constitute a fertile

  4. Le comportement symbolique dans la Préhistoire de la Roumanie: art mobilier au Paléolithique supérieur en Moldavie

    Directory of Open Access Journals (Sweden)

    Corneliu BELDIMAN

    2009-12-01

    Full Text Available RÉSUMÉ: Les approches récentes des collections anciennes aussi bien que les découvertes des derniers décennies ont permis des discussions détaillés (concernant le répertoire, la typologie, la technologie, les dates radiométriques, etc. sur les rares documents d’art mobilier (parure, objets décorés et dites “non utilitaires” appartenant au Paléolithique supérieur (Gravettien oriental, autour 23-13 kya BP et provenant de la Moldavie roumaine –région Est du pays, comprise entre les Carpates et la rivière Prut–. Les 29 artefacts signalés ont été découvertes en 6 sites de plein aire et dans un site en grotte. Les types identifiés sont: bâtons percés sur métatarse de cheval et sur bois de renne; pendeloques lithiques et en os; rondelle en bois de renne; dents percées; objets lithiques en quartzite et graphite; objets gravés et encochés lithiques et en os; harpon décoré; fragment de défense de mammouth ayant des traces de débitage et façonnage; coquilles fossiles appartenant à l’espèce Congeria?; coquilles percées appartenant à l’espèce Succinea oblonga? ou Lithoglyphus naticoides? La plupart des artéfacts ont une signification spéciale pour le phénomène de l’art et de la technologie préhistorique de la région envisagée: il s’agit des pendeloques de Mitoc, dép. de Botosani et de fragment d’os gravé d’une représentation de patte d’animal? de Piatra Neamt, dép. de Neamt. Une autre pièce exceptionnelle c’est le fragment de défense de mammouth de Lespezi, dép. de Bacau portant sur l’extrémité proximale des traces de débitage par entaillage et probablement par sciage à la ficelle; cela peut être le plus ancienne situation de cette sorte signalée dans cette partie de l’Europe. Tenant compte du fait que les objets en ivoire de mammouth sont apparitions extrêmement rares dans le Paléolithique supérieur de la Roumanie et les analogies on peut envisager la provenance de cet

  5. Radon in geological medium

    International Nuclear Information System (INIS)

    Hricko, J.

    1995-01-01

    The paper presented deals with behavior of the radon in geological medium and with some results of the radon survey in Bratislava and Kosice regions. 1) The a v has been detected in the holes 0.80 m deep. The density of observations - 3 reference areas (one represents 20 stations) per 1 km 2 . The radon risk maps in 1:25000 and 1:50000 scales have been compiled. The 56.8% of the project area lies in low radon risk, 37.6% in medium radon risk and 5.6% in high radon risk. Follow-up monitoring of the equivalent volume radon activity (EVRA) at the flats, located in the areas with high radon risk of the surface layer, has showed values several times higher than Slovak limits (Marianka, Raca, Vajnory). The evidence that neotectonic is excellent medium for rising up emanation to the subsurface layer, is shown on the map. The tectonic zone of Liscie udolie in Bratislava-Karlova Ves area has been clearly detected by profile radon survey (a v > 50 kBq/m 3 ). 2) At present, northern half of the area of Kosice in question was covered by radon survey. The low and medium radon risks have been observed here, while localities with high radon risk are small in extent. The part of radon risk and soil permeability map from northern Kosice area is shown. (J.K.) 3 figs., 2 refs

  6. Intégration des TIC dans la gouvernance locale au Sénégal | CRDI ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Ce projet s'inscrit dans le contexte de la mise en oeuvre du plan d'action du Somment mondial sur la société de l'information (SMSI). Ce plan met l'accent entre autres sur la nécessité d'un partenariat public-privé pour permettre aux collectivités africaines un accès généralisé aux technologies de l'information et de la ...

  7. Préservation de la diversité génétique dans le genre Gossypium au ...

    African Journals Online (AJOL)

    Le but de l'étude a été de réunir et d'évaluer la diversité génétique des cotonniers traditionnels afin de les valoriser et de les conserver. Dans 243 villages, 336 accessions ont été collectées. Pendant la campagne hivernale 2010-2011, une évaluation préliminaire a été faite à partir de 25 caractères qualitatifs et quantitatifs.

  8. Radon and Cancer

    Science.gov (United States)

    ... residential radon on lung cancer risk. In these studies, scientists measure radon levels in the homes of people ... United States. By combining the data from these studies, scientists were able to analyze data from thousands of ...

  9. Radon in Austria

    International Nuclear Information System (INIS)

    Friedmann, H.

    2000-01-01

    Several projects in Austria deal with the problem of enhanced radon exposure to the public. The Austrian Radon Project is the largest project within this task, with the aim of investigating the radon concentrations in Austrian homes. Another project concerns mitigation methods. According to the EU directive EURATOM 96/29 it is also necessary to check working places for possibly enhanced radon concentrations. These projects are and will be funded by the government. The federal government of Upper Austria sponsored a project to test the indoor air quality in kindergartens including radon measurements. Within an EU research project, the radon concentrations in Austrian springs and groundwater were systematically listed and analyzed. Additional investigations will focus on methods to improve the radon potential maps from the Austrian Radon Project by including geological and other information. (author)

  10. Radon survey techniques

    International Nuclear Information System (INIS)

    Anon.

    1976-01-01

    The report reviews radon measurement surveys in soils and in water. Special applications, and advantages and limitations of the radon measurement techniques are considered. The working group also gives some directions for further research in this field

  11. Au fil du temps. Une infrastructure évolutive dans un espace vert préservé à Fribourg

    OpenAIRE

    Ruffieux, Jessica

    2016-01-01

    La prise de conscience des enjeux environnementaux et l'accélération continue des changements sociétaux questionnent les modalités actuelles de production du bâti. Avec le développement des technologies, notre espace est devenu de plus en plus virtuel, nous faisant perdre le lien avec notre environnement direct; nous vivons la majorité du temps à l'intérieur, que ce soit pour nous déplacer, habiter ou travailler. Pour répondre à ces enjeux, le projet Au fil du temps propose une infrastructure...

  12. Radon in buildings

    International Nuclear Information System (INIS)

    Connell, J.J.

    1991-01-01

    This guide is intended to inform designers, householders and other building owners about the radon problem and to help in deciding if there is need to take any action to reduce radon levels in their homes or other buildings.It explains what radon is, how it enters buildings and what effect it may have on health. Reference is made to some of the usual ways of reducing the level of radon and guidance is given on some sources of assistance

  13. Les terrains militaires comme ressort de l’urbanisation au XXe siècle dans l’agglomération lyonnaise

    Directory of Open Access Journals (Sweden)

    Marie-Clotilde Meillerand

    2011-07-01

    Full Text Available Cet article revient sur la place des emprises militaires au sein de la ville contemporaine. En partant du cas de la région lyonnaise, l’analyse revient sur les liens qui existent entre les terrains militaires et un certain nombre de projets et d’aménagements urbains élaborés au cours du XXe siècle. À travers différents exemples, notre propos sera particulièrement sensible à la façon dont les autorités locales et les urbanistes ont profité de ces exceptions foncières pour remodeler ou tenter de remodeler la cité. L’objectif est aussi d’identifier les différentes raisons qui ont justifié le retour de ces territoires dans le domaine civil, des raisons hygiénistes jusqu’aux exigences des équipements liées à l’accélération de l’urbanisation.This article reexamines the importance of military-owned land at the heart of the contemporary city. Taking the Lyon region as an example, the analysis returns to the links that existed between military-owned land and a certain number of urban and redevelopment projects elaborated during the twentieth-century. Taking various examples into consideration, this article focuses in particular on the ways that local authorities and urban specialists have taken advantage of these real estate privileges to remodel, or attempt to remodel, the city. This article also aims to identify the different reasons that legitimized a return from military-owned to civilian-owned land such as those ranging from public health to those concerning the demands made by installations linked to the acceleration of the urbanization process.

  14. Le conseil donné au roi dans le Sendebar (1253 : étude de sémantique et de pragmatique

    Directory of Open Access Journals (Sweden)

    Bernard DARBORD

    2011-11-01

    Full Text Available Le Sendebar (1253 est un recueil de contes espagnols, héritier d’une longue tradition orientale. Comme dans beaucoup d’œuvres de ce type (Calila e Dimna, Barlaam e Josaphat, le récit-cadre et les contes enchâssés sont articulés autour de la figure du conseiller du roi. La présente étude analyse la nature et la portée du conseil donné au roi par sa femme, par les sages et enfin par l’« enfant sage » ou puer senex (le fils du roi, qui seul parvient à convaincre entièrement son père. La force pragmatique de ces propos réduit la part faite au dialogue. De là le caractère hiératique et impassible de la figure du roi.El Sendebar (1253 es una colección de cuentos españoles, heredera de una larga tradición oriental. Como en otras muchas obras de este tipo (Calila e Dimna, Barlaam e Josaphat, el relato-marco y los cuentos intercalados se articulan en torno a la figura del consejero del rey. El presente estudio analiza la naturaleza y el alcance del consejo dirigido al rey por la esposa, por los sabios y, al fin, por el infante sabio, puer senex (cuyos consejos superan a aquellos de los que le han precedido. La fuerza pragmática de semejantes palabras reduce considerablemente la parte dialogada, de ahí el carácter hierático e impasible de la figura del rey.

  15. Le rôle médiateur de la satisfaction au travail dans le lien entre l’intensité de la gestion des ressources humaines et le roulement du personnel

    Directory of Open Access Journals (Sweden)

    Emmanuel Nwahanye

    2016-09-01

    Full Text Available Ce travail évalue empiriquement le rôle médiateur de la satisfaction au travail dans le lien entre l’intensité de la gestion des ressources humaines (GRH et le roulement du personnel mis en évidence par de nombreux modèles de départ d’employés. Il est conduit sur un échantillon de 73 institutions financières en activité au Cameroun et fait appel à la méthode causale d’analyse des effets médiateurs adaptée du modèle de Baron & Kenny (1986. Les résultats assortis des régressions montrent, d’une part, que la satisfaction est un médiateur partiel dans le lien entre l’intensité de la GRH et le taux de roulement volontaire. D’autre part, elle est un médiateur parfait dans le lien entre l’intensité de la GRH et la propension à quitter. Il recommande aux dirigeants d’accorder une attention particulière à la satisfaction au travail en matière de rétention du personnel.

  16. Les médiations sociales, culturelles et technologiques dans la production et l’appropriation des intergiciels de l’industrie du jeu vidéo au Canada

    OpenAIRE

    Charrieras, Damien

    2011-01-01

    Le secteur industriel des intergiciels de jeux vidéo (game middleware) est très lié au développement des industries du jeu vidéo dans lequel le Canada est très actif et dont l’importance économique ne cesse de croître. Dans son étude du rôle des industries de l’intergiciel dans la filière de production d’un jeu vidéo l’auteur s'est penché sur la circulation des intergiciels de jeux vidéo pour explorer les multiples relations existantes entre les sociétés d’intergiciel, les entreprises de déve...

  17. Conflits et organisation de l’espace public dans les processus décisionnaires en France et au Brésil: la négociation d’aires protégées

    OpenAIRE

    Tilbeurgh, Véronique Van; Costa, Guilherme Borges da

    2016-01-01

    L´objectif de cet article est d’interroger le lien entre le conflit et l’organisation de l’espace public dans les processus de négociation d’une décision publique. Nous comparons les négociations dans deux zones protégées, le parc marin en mer d’Iroise (en France) et l´aire protégée Várzea do Rio Tietê (au Brésil). Cette comparaison montre que dans les deux cas, la décision devant être négociée a été imposée par une des parties, mais cette situation n’a eu un effet amplificateur du conflit qu...

  18. Les savants genevois dans l'Europe intellectuelle du XVIIe au milieu du XIXe siècle

    CERN Document Server

    1987-01-01

    Après une introduction sur l'essor de la science genevoise par Jean STAROBINSKI et un chapitre sur l'Europe savante (1700-1850) par Jacques ROGER, sont présentés les travaux et recherches dans les différentes disciplines: l'astronomie par Marcel GOLAY, les mathématiques par Pierre SPEZIALI, la physique par Pierre SPEZIALI, la chimie par Armand BUCHS, la géologie par Albert V. CAROZZI, la zoologie par Marino BUSCAGLIA, la botanique par Jacques NAEF; suivis des biographies des savants genevois par Jean-Michel PICTET, avec petits portraits; notes; index; photos et fac-similés de documents; bibliographies par chapitre. Ouvrage publié par l'Association pour le Musée d'histoire des sciences de Genève, présidé par Jacques TREMBLEY.

  19. L’instrumentation des pratiques réflexives dans la formation au travail social à la Réunion

    Directory of Open Access Journals (Sweden)

    Dolize Sidambarompoullé

    2005-01-01

    Full Text Available L’article présente un prototype d’ingénierie de l’alternance destiné à la formation initiale des assistants sociaux à la Réunion. Le modèle adopte une approche socioconstructiviste instrumentée par des technologies en réseau définissant le contexte d’une réflexion collective et permettant aux étudiants de développer ensemble, avec le support d’un groupe de praticiens expérimentés du domaine, des réflexes professionnels. Le modèle proposé est une tentative de réponse à la dégradation actuelle des conditions de travail, au manque de valorisation des professionnels et à la baisse de la qualité du service. Il permet de renforcer l’alternance, de rompre l’isolement de l’étudiant en cours de stage et de passer ainsi d’une logique de contenus à une logique de processus, d’une logique de résultats à une logique de moyens, d’une logique pédagogique quasi scolaire à une logique andragogique de professionnalisation. La recherche et l’expérimentation se sont déroulées à l’Université de la Réunion, au VCILT de l’Université de Maurice et à l’Institut Régional de Travail Social (IRTS de la Réunion de 2001 à 2005, à la suite de quoi le modèle a été adopté pour la formation initiale à l’IRTS de la Réunion.

  20. Establishing the level of exposure to radon gas in dwellings

    International Nuclear Information System (INIS)

    Karupa, Jackson Uakaningirua

    2016-04-01

    The main source of natural internal irradiation of man is radon and its decay products. In this study, the radon concentration levels in selected dwellings in Erongo region, Swakopmund, Namibia will be estimated using passive or active radon detector. The primary objective of the study is to measure and establish radon levels in selected dwellings in Erongo region, Swakopmund of Namibia. Measurements will be carried out for the period of twelve months and after three months period the detectors will be exchanged for laboratory analysis. The results obtained from the study will reveal the concentration of radon in most of the selected dwellings in Erongo region, Swakopmund, Namibia. Once Radon level is measured or identified, the results with data from work done in other environments in Africa and elsewhere will be compared. In case of high radon concentrations in dwelling, the occupants will be advised to ensure good ventilation practices as cost effective means of mitigation of indoor radon gas level in the area. (au)

  1. Radon Resources for Home Buyers and Sellers

    Science.gov (United States)

    ... EPA United States Environmental Protection Agency Search Search Radon Contact Us Share Radon Resources for Home Buyers and Sellers Radon Protection: ... a question, provide feedback, or report a problem. Radon Indoor Air Quality Home Page Radon Home Local ...

  2. Overview of current radon and radon daughter research at LBL

    International Nuclear Information System (INIS)

    1983-01-01

    This report provides a brief summary of radon and radon daughter research at Lawrence Berkeley Laboratory. The radon and radon daughter research program has two broad goals: (1) the study of sources of radon and its subsequent transport into houses, and (2) research on the behavior of radon daughters in indoor environments. Additional research effort is directed to several auxiliary areas, including development of instrumentation and monitoring techniques, studies of indoor air movement, and measurement and control of indoor particulate concentrations

  3. Consumer's Guide to Radon Reduction

    Science.gov (United States)

    ... Protection Agency Search Search Radon Contact Us Share Consumer's Guide to Radon Reduction: How to Fix Your ... See EPA’s About PDF page to learn more. Consumer's Guide to Radon Reduction: How to Fix Your ...

  4. Les sports de nature dans le Parc national de la Guadeloupe : des conflits potentiels au potentiel de coopération

    Directory of Open Access Journals (Sweden)

    Nathalie Lahaye

    2009-09-01

    Full Text Available La perspective d’un classement en « cœur de parc » des îlets Pigeon, haut lieu de la plongée sous-marine, relance les débats autour de la place des sports de nature dans le Parc national de la Guadeloupe. Faut-il craindre une interdiction de la plongée sous-marine en cœur de parc, comme ce fut le cas pour le canyoning, suite au conflit environnemental entourant cette pratique? La réglementation est-elle toujours de mise, alors que la loi sur les parcs de 2006 exhorte les parcs à s’engager dans des démarches partenariales, afin de bâtir un projet de territoire reposant sur les principes du développement durable et de solidarité écologique entre le cœur de parc et ses espaces environnants ? Parallèlement, si le Parc doit passer d’une gestion de crises, souvent hésitante et parfois arbitrale, à une gestion concertée, de quel potentiel de coopération dispose-t-il pour dépasser des situations de conflits potentiels comme celle des îlets Pigeon? Existe-t-il un effet d’apprentissage du conflit du canyoning capable de modeler ce potentiel de coopération ?The probability that the Pigeon Islands, a Mecca for diving, will be classified as a protected “heart of park”, reopens the debate about outdoor sports in the National Park of Guadeloupe. Should we be worried about the prohibition of diving in this “heart of park”, as has happened in the case of canyoning, following an environmental conflict around this practice? Are regulations always acceptable, when at the same time the law on the national parks of 2006 exhorts the parks to make a commitment to participatory initiatives, and to create projects based on the principles of sustainable development and ecological solidarity between the heart of park and its surrounding spaces? At the same time, if the Park has to develop from a crisis management style, with hesitating and arbitrary decisions, to a more cooperative management style, what potential is there to use

  5. Accouchement gémellaire en milieu africain: une analyse de 10 ans dans le district de Bamako au Mali

    Science.gov (United States)

    Théra, Tiounkani; Mounkoro, Niani; Traore, Soumana Omar; Hamidou, Albachar; Traore, Mamadou; Doumbia, Saleck; Tall, Saoudatou; Kouma, Aminata

    2018-01-01

    Introduction Le but de cette étude était de déterminer les facteurs influençant le pronostic de l'accouchement du deuxième jumeau. Méthodes L'étude était rétrospective et a porté sur tous les cas d'accouchements gémellaires enregistrés à la maternité du Centre de Santé de Référence de la commune V du District de Bamako du 1erJanvier 2007 au 31 Décembre 2016 soit sur une période de dix ans. Résultats Nous avons enregistré 34.899 accouchements dont 1374 accouchements gémellaires soit une fréquence de 2,54%; près de 15% étaient des primipares; 39,16% étaient référées; 69,10% et 15,5% autres sans aucun suivi prénatal. Les facteurs influençant négativement pronostic du deuxième jumeau étaient: un délai ≥ 15minutes entre les jumeaux, le recours tardif à la césarienne, la non qualification de l'accoucheur, la grossesse monochoréale, le faible poids de naissance. Par contre la parité, la réalisation de manœuvres obstétricales n'avaient aucune influence sur le pronostic du deuxième jumeau. Conclusion Le pronostic du deuxième jumeau est fortement influencé par un délai de naissance de plus de 15 minutes entre les jumeaux, les autres facteurs agissant comme des cofacteurs. PMID:29662606

  6. Leukaemia risks and radon

    International Nuclear Information System (INIS)

    Wolff, S.P.

    1991-01-01

    A correlation has been established between domestic radon exposure and mutation in peripheral T lymphocytes. Some caution must be exercised, however, in interpreting this result as evidence that levels of domestically encountered radon are sufficient to cause leukaemogenic chromosomal alterations. Radon may simply be acting as a surrogate for some other mutagenic factor. Correlations with Local Authority statistics collected in the United Kingdom 1981 Census appear to show that lower domestic radon levels reflect relatively greater socioeconomic deprivation whereas higher levels reflect greater prosperity. The relative risk of lymphoproliferative disease correlates with the same factors that determine domestic radon levels at the county level. Putative relationships between domestic radon exposure and cancer thus need to be controlled for socioeconomic status and associated factors, at least at the county level. (The correlations may not apply to smaller areas.) Similarly, the causative factors underlying the relationships between higher regional socioeconomic status and leukaemia require closer examination. (author)

  7. Radon and cancer

    International Nuclear Information System (INIS)

    2011-01-01

    This publication proposes an overview on what is known about the carcinogenic effect of radon. It recalls the origin of radon, its presence in the environment, and its radioactivity. It comments data on the relationship between exposure to radon and lung cancer, and with other forms of cancer. It discusses the role of the exposure level, and the cases of professional and domestic exposure with respect to these risks. It indicates the hazardous areas in France which are well identified, outlines that smokers are more likely victims of risks related to radon, that this risk is still underrated and underestimated (notably by the public). It gives an overview of existing regulations regarding exposure to radon, of public health policies and national plans concerning radon, and recalls some WHO recommendations

  8. Startling radon risk comparisons

    International Nuclear Information System (INIS)

    Martin, J.D.

    1990-01-01

    It has long been known that radon causes lung cancer in humans. Radon, in fact, has been called the greatest environmental health threat facing the nation. Despite the fact that people in the united States generally have a great fear of radiation, their attitude toward radon risk has been one of apathy. Traditional radon risk comparison data have, to say the least, been uninspired as well as unmotivating o the public. This paper, using publicly available data, compares radon risk to other pollutants, diseases and health issues that concern and motivate the public. These health data have never before been assembled together in such a dramatic tabulation, making the radon risk clearly evident and tangible. Results of a nationwide risk opinion survey will also be discussed

  9. Comparaison des performances de deux souches de truite commune (Salmo trutta L. (domestique et hybride sauvage x domestique introduites au stade alevin dans un ruisseau

    Directory of Open Access Journals (Sweden)

    NIHOUARN A.

    1990-10-01

    Full Text Available La production d'un hybride mâle sauvage x femelle domestique, chez la truite commune (Salmo trutta a parfois été proposée pour le repeuplement (CUINAT, 1971. Nos précédents travaux (MAISSE et al., 1983 ont montré que ces sujets sont plus difficiles à élever que ceux dont les deux parents sont domestiques. La présente étude a porté sur la comparaison des performances des hybrides et des domestiques déversés simultanément dans un ruisseau où la reproduction de la truite est compromise par le colmatage du fond. Les déversements ont été effectués sur la totalité du ruisseau, en mai, deux années de suite. Des inventaires ont été réalisés sur des secteurs représentatifs en mai, avant les déversements, et en octobre. Les résultats ont montré que les taux d'implantation, tant en 0+ qu'en 1+, ne différaient pas suivant l'origine des poissons. De plus, sur chacun des secteurs inventoriés, les individus d'origine domestique ont gardé l'avantage de taille qu'ils avaient au moment du déversement. L'intérêt d'un tel croisement est discuté en fonction des diverses stratégies de repeuplement à mettre en œuvre.

  10. Radon therapy; Radon in der Therapie

    Energy Technology Data Exchange (ETDEWEB)

    Spruck, Kaija [Technische Hochschule Mittelhessen, Giessen (Germany). Inst. fuer Medizinische Physik und Strahlenschutz

    2017-04-01

    Radon therapies are used since more than 100 years in human medicine. Today this method is controversially discussed due to the possible increase of ionizing radiation induced tumor risk. Although the exact mode of biological radiation effect on the cell level is still not known new studies show the efficiency of the radon therapy without side effect for instance for rheumatic/inflammatory or respiratory disorders.

  11. Radon-Instrumentation; Radon-Instrumentacion

    Energy Technology Data Exchange (ETDEWEB)

    Moreno y Moreno, A. [Departamento de Apoyo en Ciencias Aplicadas, Benemerita Universidad Autonoma de Puebla, 4 Sur 104, Centro Historico 72000 Puebla (Mexico)

    2003-07-01

    The presentation of the active and passive methods for radon, their identification and measure, instrumentation and characteristics are the objectives of this work. Active detectors: Active Alpha Cam Continuous Air Monitor, Model 758 of Victoreen, Model CMR-510 Continuous Radon Monitor of the Signature Femto-Tech. Passive detectors: SSNTD track detectors in solids Measurement Using Charcoal Canisters, disk of activated coal deposited in a metallic box Electrets Methodology. (Author)

  12. Radon in buildings

    International Nuclear Information System (INIS)

    Ryan, N.M.; Finn, M.

    1995-01-01

    This guide is intended to inform designers, contractors, householders and other building owners about radon in buildings and to provide guidance where it has been decided to take action to reduce radon levels. It gives some pointers to good practice insofar as it relates to non complex buildings of normal design and construction. Reference is made to the usual ways of reducing l;levels of radon and guidance is given on sources of further information. I

  13. Radon in public buildings

    International Nuclear Information System (INIS)

    Schulz, Hartmut; Sperrhacke, Andrea

    2009-01-01

    In the years 2005 to 2008, the Radon situation and the relevant processes in different public buildings have been investigated. The results confirm that the Radon concentrations in times of using can be quite different from that of non-using periods. This is mainly caused by the differing conditions of air changement. Because of the narrow connection between the interior Radon concentration and air changement it is obvious to consider in complex the Radon situation together with measures for interior hygiene and energy saving. (orig.)

  14. Les codes du paraître dans l'espace scolaire. Les manuels de civilité en Espagne au XIXe siècle et au début du XXe

    Directory of Open Access Journals (Sweden)

    Jean-Louis Guereña

    2009-12-01

    Full Text Available L'intérêt du manuel scolaire pour l'histoire des idéologies et des mentalités n'est plus à démontrer, d'autant qu'il se trouve soumis en Espagne à un double contrôle idéologique, tant du pouvoir civil comme des instances religieuses. Vecteurs de systèmes de valeurs, les manuels scolaires servent d'instruments dans la consolidation des formes et des codes moraux et sociaux : défense de la propriété privée, conservation de l'ordre public, protection de l'ordre moral. Dans les manuels de civilité (urbanidad, la jeunesse scolarisée pouvait apprendre les normes essentielles des usages sociaux, les codes, les valeurs, les comportements et les conduites qui définissaient le modèle d'homme et de femme « civilisés » que les classes dominantes prétendaient diffuser pour asseoir leur pouvoir. La civilité vise donc une entreprise de rationalisation, de régulation des conduites, une mise en ordre qui affecte toutes les sphères de la vie, tant privée (espace domestique que publique (école, Église, rue, magasin… et, dans l’ensemble, toutes les activités (travail et loisirs. Au cœur de ce dispositif se retrouvent les notions d'usage, de bienséance (decoro, variable selon les civilisations et les peuples, et de respect : respect de soi-même en premier lieu (hygiène corporelle et tenue vestimentaire, mais toujours vis-à-vis des autres (odeurs, formes, couleurs…, respect des autres (tant êtres humains qu'animaux, et même les plantes. Ces notions sont toutes deux fondées sur l'apparence et le paraître. La norme sociale, le comportement se trouve en effet réglé par une codification sociale des usages, des rôles, et, comme l'indique un manuel, si « les animaux font ce qu'ils veulent », « les personnes font ce que commande la décence ». Nous examinons donc les différents codes du paraître à l'œuvre dans ces manuels espagnols de civilité du XIXe siècle.El interés del libro de texto para la historia de

  15. Radon transport in fractured soil. Laboratory experiments and modelling

    International Nuclear Information System (INIS)

    Hoff, A.

    1997-10-01

    Radon (Rn-222) transport in fractured soil has been investigated by laboratory experiments and by modelling. Radon transport experiments have been performed with two sand columns (homogeneous and inhomogeneous) and one undisturbed clayey till column containing a net of preferential flow paths (root holes). A numerical model (the finite-element model FRACTRAN) and an analytic model (a pinhole model) have been applied in simulations if soil gas and radon transport in fractured soil. Experiments and model calculations are included in a discussion of radon entry rates into houses placed on fractured soil. The main conclusion is, that fractures does not in general alter transport of internally generated radon out of soil, when the pressure and flow conditions in the soil is comparable to the conditions prevailing under a house. This indicates the important result, that fractures in soil have no impact on radon entry into a house beyond that of an increased gas permeability, but a more thorough investigation of this subject is needed. Only in the case where the soil is exposed to large pressure gradients, relative to gradients induced by a house, may it be possible to observe effects of radon exchange between fractures and matrix. (au) 52 tabs., 60 ill., 5 refs

  16. Mesure de la fraction d'evenements a quatre quarks dans les desintegrations multihadroniques du boson Z au LEP

    Science.gov (United States)

    Lefebvre, Eric

    Cette thèse propose de tester la Chromodynamique Quantique (QCD) en effectuant une mesure précise d'une des trois constantes fondamentales du groupe de symétrie SU(3) utilisé pour décrire la physique des interactions fortes. Cette constante fondamentale, appelée TF, est reliée à certains états finaux spécifiques des désintégrations du Z0. Ces états apparaissent sous forme de perturbations du deuxième ordre en as et sont illustrés par des diagrammes de Feynman. À cet ordre, la chromodynamique prévoit deux types de diagrammes de Feynman distincts; le premier contient, un quark, un antiquark et deux gluons, et le second, deux quarks et deux antiquarks. La constante TF est directement proportionnelle à la fraction d'événements à deux quarks et deux antiquarks qui est l'objet de notre mesure. Notre mesure est fondée sur l'étude des événements à quatre partons dans l'état final. Ces quatre partons, en s'hadronisant, produisent quatre jets de particules qui peuvent être détectés expérimentalement et identifiés à l'aide d'algorithmes de reconstruction des jets. Des observables angulaires nous permettent de faire une discrimination parmi les états finaux de la désintégration du Z0, et ainsi déterminer la valeur de la fraction d'événements à deux quarks et deux antiquarks fq. Cette fraction peut s'exprimer par le rapport de la fraction observée expérimentalement fexq sur la fraction théorique fthq , R4q=fex qfthq. Afin d'améliorer la mesure de cette fraction et de diminuer le bruit causé par une contamination des événements d'ordres supérieurs, nous avons développe une méthode d'extrapolation. Cette méthode s'appuie sur la caractérisation de l'espace de phase des événements, exprimée par les paramètres yij. Les mesures de R4q que nous obtenons sont: R4q=2,27+0,29 -0,56 à l'aide d'une méthode conventionnelle avec la condition de sélection y34 > 0,020 > y45, et R4q=1,22+0,56 -0,71 à l'aide de notre méthode d

  17. The determination of iodine in biological media using radioactivation analysis (1962); Dosage de l'iode dans les milieux biologiques au moyen de l'analyse par radioactivation (1962)

    Energy Technology Data Exchange (ETDEWEB)

    Comar, D. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1962-06-15

    The object of this study is to show that the application of radioactivation analysis to the determination of iodine in biological media makes it possible to measure iodine concentrations of the order of 0.0001 {mu}g. After a review of the chemical methods with a mention of the difficulties they present, the optimum conditions for the determination of iodine in biological liquids are given. Three methods are described: - the first consists of a chemical treatment which liberates the protein bound iodine in an inorganic form. After distillation this iodine is irradiated in a flux of thermal neutrons. The induced radioactivity is compared to that of a standard sample irradiated in the same conditions by {gamma} spectrometry. - the second method which is of more general application consists in irradiating the sample and then extracting the iodine; its induced radio-activity is then measured by {beta}-counting. - the third method measures the iodine directly in the thyroid tissue by anti-compton spectrometry. The sensitivity, the reproducibility and the accuracy are discussed. Some applications are described: determination of iodine in its various organic forms in serum, determination of iodine in urines, in food-stuffs, etc., in the thyroid tissue, etc. (author) [French] Le but de cette etude est de montrer que l'analyse par radioactivation appliquee au dosage de l'iode dans les milieux biologiques permet de mesurer des taux d'iode de l'ordie de 0,0001 {mu}g. Apres avoir rappele le principe des methodes chimiques et montre les difficultes de leur mise en oeuvre, il est etabli les conditions optima pour realiser le dosage de l'iode dans les liquides biologiques. Trois methodes sont decrites; - la premiere consiste a pratiquer un traitement chimique liberant l'iode proteique sous forme minerale. Apres distillation cet iode est irradie dans un flux de neutrons thermiques. La radioactivite induite est mesuree comparativement a celle d

  18. Variations saisonnières des facteurs hydrologiques et du biovolume microalgal benthique au sein d'un habitat artificiel (Acadja-enclos) dans la lagune Ebrié: site d'Adiapoté

    OpenAIRE

    Konan-Brou, Amoin Annabelle

    1993-01-01

    Cet article présente les résultats d'une étude comparative des caractéristiques physico-chimiques (température, turbidité, salinité, pH, concentration en O2 dissous, en phosphates, nitrates, nitrites, ammoniaque)au sein d'une structure d'aquaculture extensive (acadja-enclos)ou habitat artificiel pour poissons et dans l'eau libre environnante. Les caractéristiques du périphyton se développant sur les bambous de l'acadja-enclos sont décrites. L'acadja-enclos est implanté dans le site d'Adiopoté...

  19. Une esthétique de « la mort au foyer » dans le système de réaménagement filial du cinéma de Pedro Almodovar

    Directory of Open Access Journals (Sweden)

    Claudine Le Pallec Marand

    2007-01-01

    Full Text Available « Un père n’est pas toujours la solution » Qu’est ce que j’ai fait pour mériter ça ? (1984« Tu dois apprendre à gérer autrement tes problèmes avec les hommes. » Talons aiguilles (19911. Introduction de la perspective féministe dans la figure criminelle au cinéma et la criminologieLa figure criminelle au cinéma participe de la diffusion culturelle de théories scientifiques en cours selon la pérennité de la démonstration de l’ouvrage de Marc Renneville sur la représentation culturelle du coup...

  20. Étude pour la correction acoustique de l'amphithéatre principal effectuée dans le cadre d’un stage au CERN durant l’été 2005

    CERN Document Server

    Verger, Axel

    2005-01-01

    Ce document est le compte-rendu remis au CERN le 31 août 2005 et détaillant l’essentiel des travaux que j’ai effectués pendant mes deux mois (juillet et août 2005) de stage au groupe FM du département TS. Il présente notamment les solutions envisageables pour la correction acoustique de l’amphithéâtre principal. Cette étude a été menée dans le cadre du stage de fin de troisième année de l’Institut National des Sciences Appliquées (INSA) de Toulouse.

  1. Exposition orale aux nanoparticules de dioxyde de titane (TiO2) : du franchissement de l’épithélium buccal et intestinal au devenir et aux effets dans l’organisme

    OpenAIRE

    Bettini, Sarah

    2014-01-01

    Face à l’utilisation exponentielle des nanomatériaux dans des produits de consommation courante, dont l’alimentation, les conséquences pour l’homme d’une exposition quotidienne aux faibles doses de nanoparticules posent des questions de santé publique. Parmi les différentes voies d’exposition, la voie orale reste la moins documentée, alors que des nanomatériaux sont couramment utilisés comme additifs alimentaires, ou incorporés `a des emballages au contact des aliments, de l’eau, pour b´en´ef...

  2. Radon flux measurement methodologies

    International Nuclear Information System (INIS)

    Nielson, K.K.; Rogers, V.C.

    1984-01-01

    Five methods for measuring radon fluxes are evaluated: the accumulator can, a small charcoal sampler, a large-area charcoal sampler, the ''Big Louie'' charcoal sampler, and the charcoal tent sampler. An experimental comparison of the five flux measurement techniques was also conducted. Excellent agreement was obtained between the measured radon fluxes and fluxes predicted from radium and emanation measurements

  3. Radon and its measurement

    International Nuclear Information System (INIS)

    Penzo, Silvia

    2006-03-01

    The work reviews the topics concerning the problem of the indoor radon and its measurement. The initial stage deals with the general features of radon, from the historical remarks about its discovery to the formation mechanisms in the soil, then passing to describe the transport processes that lead the radon to enter into the buildings. The mean radon concentration distribution among the Italian regions is reported and compared with the situation in the other countries of the world. A particular importance is given to present the national law concerning the radioprotection from the natural sources of ionizing radiations; a paragraph is completely devoted to this argument and to discuss the differences between the Italian approach and the regulations applied in the Test of Europe for both workplaces and dwellings. Chapter 3 describes the different detectors and methods to measure the radon and its short mean live decay products concentrations, together with the operative procedures and guides provided by the Italian law and by the international bodies. As an example of typical radon passive measurement device. the new ENEA detector developed at the Institute of Radioprotection is presented and discussed. Appendix 1 is entirely devoted to discuss the main remedial actions for decreasing the radon indoor concentration both for old and new buildings; appendix 2 reports the main quantities related to radon and radioprotection [it

  4. Modeling of indoor radon

    International Nuclear Information System (INIS)

    Paschoa, A.S.

    1990-01-01

    This paper reports on models for radon, which are developed not only to describe the behavior of radon and daughters since the moment that radon is created in natural sources by the alpha decay of 226 Ra up to the point that doses to humans are estimated based on the inhalation of radon and its progeny. The objective of a model should be determinant in defining the model structure and boundaries. Modeling indoors radon is particularly useful when the 226 Ra concentration in building materials and soils can be known before a house will be built with such 226 Ra bearing materials and over 226 Ra rich soils. The reported concentrations of 226 Ra in building materials range from 0.3 Bq · kg -1 in wood to about 2.6 x 10 3 Bq · kg -1 in aerated concrete based on alum shale. 30 In addition, when a house is built on a soil containing a high 226 Ra concentration, radon exhalation from the soil contributes to increase radon concentration indoors. The reported radon exhalation from soils range from 3.4 Bq · m -2 · s -1 in latosolic soil from Osaka, Japan to about 53 mBq · m -2 · s -1 in chernozemic soil from Illinois

  5. Radon: Not so Noble

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 5; Issue 7. Radon: Not so Noble-Radon in the Environment and Associated Health Problems. Deepanjan Majumdar. General Article Volume 5 Issue 7 July 2000 pp 44-55. Fulltext. Click here to view fulltext PDF. Permanent link:

  6. MODEL RADIOACTIVE RADON DECAY

    Directory of Open Access Journals (Sweden)

    R.I. Parovik

    2012-06-01

    Full Text Available In a model of radioactive decay of radon in the sample (222Rn. The model assumes that the probability of the decay of radon and its half-life depends on the fractal properties of the geological environment. The dependencies of the decay parameters of the fractal dimension of the medium.

  7. LARGE BUILDING RADON MANUAL

    Science.gov (United States)

    The report summarizes information on how bilding systems -- especially the heating, ventilating, and air-conditioning (HVAC) system -- inclurence radon entry into large buildings and can be used to mitigate radon problems. It addresses the fundamentals of large building HVAC syst...

  8. Radon in Syrian houses

    International Nuclear Information System (INIS)

    Othman, I.; Hushari, M.; Raja, G.; Alsawaf, A.

    1996-01-01

    A nationwide investigation of radon levels in Syrian houses was carried out during the period 1991-1993. Passive radon diffusion dosemeters using polycarbonate detectors were distributed in houses all over Syria. Detectors were subjected to electrochemical etching to reveal latent tracks of alpha particles. The mean radon concentration in Syrian houses was found to be 45 Bq m -3 with some values several times higher. This investigation indicated that there were a few houses in Syria that require remedial action. Most houses that have high levels of radon were found in the southern area, especially in the Damascus governorate. The study also indicated that radon concentrations were higher in old houses built from mud with no tiling. (author)

  9. Chemical properties of radon

    International Nuclear Information System (INIS)

    Stein, L.

    1987-01-01

    Radon is frequently regarded as a totally inert element. It is however, a ''metalloid'' - an element which lies on the diagonal of the Periodic Table between the true metals and nonmetals and which exhibits some of the characteristics of both. It reacts with fluorine, halogen fluorides, dioxygenyl salts, fluoro-nitrogen salts, and halogen fluoride-metal fluoride complexes to form ionic compounds. Several of the solid reagents can be used to collect radon from air but must be protected from moisture, since they hydrolyze readily. Recently, solutions of nonvolatile, cationic radon have been produced in nonaqueous solvents. Ion-exchange studies have shown that the radon can be quantitatively collected on columns packed with either Nafion resins or complex salts. In its ionic state, radon is able to displace H/sup +/, Na/sup +/, K/sup +/, Cs/sup +/, Ca/sup 2+/, and Ba/sup 2+/ ions from a number of solid materials

  10. Indoor radon mitigation

    International Nuclear Information System (INIS)

    Arvela, H.; Reisbacka, H.

    2009-06-01

    The action limit for indoor radon concentration in Finnish dwellings is 400 Bq/m 3 which is exceeded in 50.000 dwellings. In these dwellings indoor radon mitigation is needed. The most important reason for high concentration is the soil air with high radon concentrations that flows into living spaces through openings and gaps in the building foundation. Slab on-ground is the most prevalent type of foundation in Finnish single family houses. Without preventive measures, this type of foundation promotes the flow of radon-bearing soil air into living spaces. In the second popular foundation type, hill-side houses, the flow of soil air through the walls backing soil still increases radon leakages. The key aim of indoor radon mitigation is to prevent or decrease the harmful flows of radon-bearing soil air into dwellings. This guide gives the basic information on Finnish regulations on indoor radon, leakage routes, effect of air exchange and underpressure as well as pre-mitigation studies of houses. The results on the efficiency of various mitigation methods are based on a questionnaire study in 400 Finnish dwellings and on-site studies in numerous houses. In the case of sub-slab-suction the Finnish guide published by the Ministry of Environment has also been utilized. Best mitigation efficiency has been achieved using sub-slab-suction and radon well. Typical reduction factors for both methods are 70 - 90%, and the best results are above 95%. Sub-slab-suction can be implemented through both floor slab and foundation wall. An exhaust fan coupled to suction pit and exhaust piping creates underpressure and ventilation beneath the slab. In case of a radon well an exhaust fan sucks air from the soil and ventilates the soil air volume through a well construction placed outside the house. The depth of a radon well is 3 - 5 metres. A single radon well can reduce radon concentration in many dwellings at the distance up to 20 - 30 metres. Mitigation work based on ventilation aims

  11. Indoor radon mitigation

    International Nuclear Information System (INIS)

    Arvela, H.; Reisbacka, H.

    2008-09-01

    The action limit for indoor radon concentration in Finnish dwellings is 400 Bq/m 3 which is exceeded in 50.000 dwellings. In these dwellings indoor radon mitigation is needed. The most important reason for high concentration is the soil air with high radon concentrations that flows into living spaces through openings and gaps in the building foundation. Slab on-ground is the most prevalent type of foundation in Finnish single family houses. Without preventive measures, this type of foundation promotes the flow of radon-bearing soil air into living spaces. In the second popular foundation type, hill-side houses, the flow of soil air through the walls backing soil still increases radon leakages. The key aim of indoor radon mitigation is to prevent or decrease the harmful flows of radon-bearing soil air into dwellings. This guide gives the basic information on Finnish regulations on indoor radon, leakage routes, effect of air exchange and underpressure as well as pre-mitigation studies of houses. The results on the efficiency of various mitigation methods are based on a questionnaire study in 400 Finnish dwellings and on-site studies in numerous houses. In the case of sub-slab-suction the Finnish guide published by the Ministry of Environment has also been utilized. Best mitigation efficiency has been achieved using sub-slab-suction and radon well. Typical reduction factors for both methods are 70-90%, and the best results are above 95%. Sub-slab-suction can be implemented through both floor slab and foundation wall. An exhaust fan coupled to suction pit and exhaust piping creates underpressure and ventilation beneath the slab. In case of a radon well an exhaust fan sucks air from the soil and ventilates the soil air volume through a well construction placed outside the house. The depth of a radon well is 3-5 metres. A single radon well can reduce radon concentration in many dwellings at the distance up to 20-30 metres. Mitigation work based on ventilation aims at

  12. Health effects of radon

    International Nuclear Information System (INIS)

    Easterly, C.

    1994-01-01

    Exposure of people to radon has taken on increased interest during the last decade because of the understanding that buildings can serve to trap radon and its daughters, and thereby build up undesirable concentrations of these radioactive elements. Numerous studies of underground miners (often uranium miners) have shown an increased risk of lung cancer in comparison with nonexposed populations. Laboratory animals exposed to radon daughters also develop lung cancer. The abundant epidemiological and experimental data have established the carcinogenicity of radon progeny. Those observations are of considerable importance, because uranium, from which radon and its progeny arise, is ubiquitous in the earth's crust, including coal mines. Risk estimates of the health effects of long-term exposures at relatively low levels require continued development, especially to address the potential health effects of radon and radon daughters in homes and occupational settings where the exposure levels are less than levels in underground uranium and other metal mines that have been the subject of epidemiological studies. Two approaches can be used to characterize the lung-cancer risks associated with radon-daughter exposure: mathematical representations of the respiratory tract that model radiation doses to target cells and epidemiological investigation of exposed populations, mainly underground uranium miners. The mathematically-based dosimetric approach provides an estimate of lung cancer risk related to radon-daughter exposure based specifically on modeling of the dose to target cells. The various dosimetric models all require assumptions, some of which are not subject to direct verification, as to breathing rates; the deposition of radon daughters in the respiratory tract; and the type, nature, and location of the target cells for cancer induction. The most recent large committee effort drawn together to evaluate this issue was sponsored by the National Research Council

  13. Modeling the potential impacts of different radon policies for the U.S. housing stock

    International Nuclear Information System (INIS)

    Peterson, M.D.; Ritchie, I.M.

    1995-01-01

    According to the Environmental Protection Agency (EPA) and other public health agencies in the United States, radon may be the leading cause (along with passive smoking) of lung cancer deaths among nonsmokers. Radon is estimated to be the second leading cause of lung cancer death in smokers behind smoking-related lung cancer. EPA estimates that 7,000 to 30,000 lung cancer deaths each year are due to radon exposure. (It is implied that radon-related lung cancer deaths can be prevented by reducing radon levels below EPA's guideline levels). Current EPA radon policy is based on a strategy of education, the transfer of testing and remediation technologies to the public and private sectors, and recently proposed radon-resistant construction standards for new homes. This paper models the effectiveness of current proposed, and alternative policies for reducing radon risks in U.S. residential construction. The results of our analysis suggest that EPS's projections of 2,200 'lives saved annually' as a result of its current action level of 4 pCi/l will not be achieved with its current policy in the near future. Overall, the response of radon-related mortality to most policy options is delayed and flat due in part to the large number of houses with low radon levels and the long latency period between radon exposure and the development of cancer. The modeling results suggest that more aggressive smoking reduction programs may yield greater benefits in overall lung cancer mortality (but not reduced radon exposure) than most radon-related policies. (au)

  14. Radon in public buildings

    International Nuclear Information System (INIS)

    Schulz, H.; Flesch, K.; Hermann, E.; Loebner, W.; Leissring, B.

    2009-01-01

    From the Free State of Saxony, a study was commissioned to survey how reliable measurements to characterize the radon situation in public buildings at a reasonable financial and human effort can be carried out to reduce radiation exposure in public buildings. The study approach was for 6 objects. To characterize the radon situation the time evolution measurement of radon concentrations of more than 1 to 2 weeks turned out to be sufficient. A novel data analysis enables the identification of a ''typical daily alteration of the radon concentration'' depending on the ventilation conditions and the daily use of the offices or class rooms. The identification of typical diurnal radon variations for the working time and weekends or holidays is of fundamental importance for assessing the exposure situation in public buildings. It was shown that the radon concentration during working time are in general much lower than in the times when the buildings (offices) are unused. It turned out that the long-term radon measurements with nuclear track detectors within distinct time regimes (day / night, working hours / leisure time) by utilizing switch modules are very efficient to estimate the actual exposure. (orig.)

  15. Indoor Radon Concentration Related to Different Radon Areas and Indoor Radon Prediction

    Science.gov (United States)

    Juhásová Šenitková, Ingrid; Šál, Jiří

    2017-12-01

    Indoor radon has been observed in the buildings at areas with different radon risk potential. Preventive measures are based on control of main potential radon sources (soil gas, building material and supplied water) to avoid building of new houses above recommended indoor radon level 200 Bq/m3. Radon risk (index) estimation of individual building site bedrock in case of new house siting and building protection according technical building code are obligatory. Remedial actions in buildings built at high radon risk areas were carried out principally by unforced ventilation and anti-radon insulation. Significant differences were found in the level of radon concentration between rooms where radon reduction techniques were designed and those where it was not designed. The mathematical model based on radon exhalation from soil has been developed to describe the physical processes determining indoor radon concentration. The model is focused on combined radon diffusion through the slab and advection through the gap from sub-slab soil. In this model, radon emanated from building materials is considered not having a significant contribution to indoor radon concentration. Dimensional analysis and Gauss-Newton nonlinear least squares parametric regression were used to simplify the problem, identify essential input variables and find parameter values. The presented verification case study is introduced for real buildings with respect to various underground construction types. Presented paper gives picture of possible mathematical approach to indoor radon concentration prediction.

  16. Radon affected areas: Scotland

    International Nuclear Information System (INIS)

    Miles, J.C.H.; Green, B.M.R.; Lomas, P.R.

    1993-01-01

    Board advice on radon in homes issued in 1990 specifies that areas of the UK where 1% or more of homes exceed the Action Level of 200 becquerels per cubic metre of air should be regarded as Affected Areas. Results of radon measurements in homes in the districts of Kincardine and Deeside and Gordon in Grampian Region and Caithness and Sutherland in Highland Region are mapped and used to delineate Affected Areas in these areas where required. The Scottish Office is advised to consider the desirability of developing guidance on precautions against radon in future homes. (author)

  17. Indoor radon in Slovenia

    Directory of Open Access Journals (Sweden)

    Vaupotič Janja

    2003-01-01

    Full Text Available The Slovenian Radon Programme started in 1990. Since then, radon and radon short-lived decay products have been surveyed in 730 kindergartens, 890 schools, 1000 randomly selected homes, 5 major spas, 26 major hospitals, 10 major municipal water supply plants, and 8 major wineries. Alpha scintillation cells, etched track detectors, electret-based detectors and various continuously measuring devices have been used. On the basis of estimated effective doses, decisions were made on appropriate mitigation. In total, 35 buildings have been appropriately modified. The programme is displayed and results reviewed chronologically and discussed.

  18. L’ethos communicatif de la langue-culture étrangère et le culturème social dans la classe de FLE au niveau supérieur

    Directory of Open Access Journals (Sweden)

    Romina Balduzzi

    2016-12-01

    Full Text Available Cet article résulte de l’approfondissement des études préliminaires et descriptives ayant eu trait à la pragmatique interculturelle et aux relations interpersonnelles dans le cadre de la classe de français langue étrangère au niveau supérieur. Nous constatons que dans les échanges interpersonnels et notamment dans le traitement de « tu »et« vous » entre professeurs-étudiants, il émerge ce que Lcía Molina appelle « culturème social » Celui-ci ne répondrait pas à l’ethos communicatif de la langue- culture étrangère mais à celui de la langue- culture du pays où l’on habite. Une situation de communication interculturelle authentique permettrait aux étudiants de découvrir l’ethos communicatif à travers la quotidienneté des signes culturels et ils parviendraient à une meilleure maîtrise et à une connaissance plus approfondie de leurs comportements culturels; autrement c’est la tâche aux enseignants de les faire réfléchir à la langue-culture étrangère ainsi qu’à leur propre langue et culture.

  19. Contribution des savoir-faire viticoles au développement durable et à la démarche de responsabilité Sociétale et environnementale, dans le cadre d'une gouvernance patrimoniale des terroirs

    Directory of Open Access Journals (Sweden)

    Rochard Joël

    2017-01-01

    Full Text Available Les savoirs viticoles constituent, au-delà des atouts locaux, un patrimoine humain irremplaçable. Le génie des hommes a permis à de nombreux écosystèmes terrestres, y compris parfois les plus extrêmes, d'être valorisés afin d'exprimer la quintessence du vin, expression des terroirs, ainsi que des particularités historiques et culturelles locales. Au-delà de la dimension territoriale, les savoir-faire viticoles sont également porteurs de dynamique locale, de préservation et de valorisation. Par ailleurs, ceux-ci peuvent alimenter la créativité scientifique et technologique dans une période de post modernité, en proie à des doutes et parfois des impasses, en quête de valeurs traditionnelles. La communication, à partir d'exemples, souligne la contribution des savoirs historiques locaux à une culture et une gouvernance, indispensable à la valorisation des terroirs et des vins, mais également au développement de démarche opérationnelle du développement durable en lien notamment avec la responsabilité sociale et environnementale de la filière viticole, vis-à-vis de notre planète et des générations futures.

  20. Health Risk of Radon

    Science.gov (United States)

    ... related lung cancer in women. Top of Page Biological Effects of Ionizing Radiation (BEIR) VI Report: "The ... Living Health Land, Waste, and Cleanup Lead Mold Pesticides Radon Science Water A-Z Index Laws & Regulations ...

  1. ROE Radon Data

    Data.gov (United States)

    U.S. Environmental Protection Agency — The polygon dataset represents predicted indoor radon screening levels in counties across the United States. These data were provided by EPA’s Office of Radiation...

  2. Radon in residences

    International Nuclear Information System (INIS)

    Schnell, G.A.; Monmonier, M.

    1990-01-01

    This paper addresses the geographic variation in the presence of radon at relatively high levels. Its focus is the Commonwealth of Pennsylvania but it considers the incidence of residential radon in adjoining counties in contiguous states, and by state throughout the nation. Cartographic analysis provides a robust assessment of the broad impact of physiography, the local effects of housing and lifestyle, and the quality of the best available spatial data. By promoting a fuller understanding of the pattern and magnitude of the risk, radon maps constitute a basis for a more effective and efficient prophylaxis. Further, county-unit maps of age-adjusted mortality rates for successive decades demonstrate inconsistent and puzzling linkages between the geographics of radon and cancer

  3. Radon i danske lejeboliger

    DEFF Research Database (Denmark)

    Rasmussen, Torben Valdbjørn; Skytte Clausen, Louise

    I denne undersøgelse kortlægges radonindholdet i indeluften og det undersøges, hvordan indholdet af radon i indeluften er fordelt og spredes i en ejendom, og om det er muligt at pege på en bygningsdel eller en bygningskomponent som en spredningsvej for radon i boliger. Boligerne er lejeboliger og...... ligger i etageejendomme, kæde- og rækkehuse tilhørende bygningstyper opført fra 1850 og frem. De udvalgte ejendomme ligger i områder af landet, hvor der ved tidligere undersøgelser har vist sig at være en stor andel af huse med et højt indhold af radon i indeluften. Koncentrationen af radon er målt over...

  4. Radon - natural health threat

    International Nuclear Information System (INIS)

    Wrixon, Anthony

    1985-01-01

    Natural sources of radiation attract little attention, yet a survey has found radon gas in buildings at levels which put the occupants at some risk. The author wants safety standards set without undue delay. (author)

  5. Radon in workplaces

    International Nuclear Information System (INIS)

    Reichelt, A.; Lehmann, K.-H.; Reineking, A.; Porstendoerfer, J.; Schwedt, J.; Streil, T.

    2000-01-01

    The radiological assessment of the results of radon measurements in dwellings is not automatically applicable to workplaces due to different forms of utilization, constructional conditions, time of exposure, heating and ventilation conditions, additional aerosol sources, aerosol parameters, chemical substances, etc. In order to investigate the peculiarities of the radon situation in workplaces located inside buildings compared with that in dwellings, long-time recordings of radon, attached radon progeny and unattached radon progeny concentrations ( 218 Po, 214 Pb, 214 Bi) are carried out at several categories of workplaces (e.g. offices, social establishments, schools, production rooms, workshops, kitchens, agricultural facilities). 36 workplaces have been investigated. There have been carried out at least 2-3 long-time recordings for each workplace during different seasons. At the same time the gamma dose rate, meteorological conditions, aerosol particle concentrations have been registered. Many special dates from the workplaces and the buildings have been recorded. Activity size distribution of the aerosol-attached and unattached fraction of short-lived radon decay products have been determinated in 20 workplaces. Mainly the following measurement systems were used: Radon- and Radon Progeny Monitor EQF 3020, SARAD GmbH, Germany. Alpha-Track Radon Detectors, BfS Berlin, Germany. Screen Diffusion Batteries with Different Screens, University of Goettingen, Germany. Low-Pressure Cascade Impactor, Type BERNER. Condensation Nuclei Counter, General Electric, USA. PAEC-f p -Rn-Monitor, University of Goettingen, Germany. Through the measurements, many peculiarities in the course of the radon-concentration, the equilibrium factor F, the unattached fraction f p and the activity size distribution have been determined. These amounts are influenced mainly by the working conditions and the working intervals. The influence of these peculiarities in workplaces on the dose have

  6. LES VARIANTES LEXICALES POUR LE MOT ESPADRILLES AU PARANÁ ET DANS LA RÉGION NORD-EST DU BRÉSIL: UNE ETUDE ETHNOLINGUISTIQUE

    Directory of Open Access Journals (Sweden)

    Vanderci de Andrade AGUILERA

    2013-12-01

    Full Text Available Cette étude concerne les variantes lexicales pour le mot espadrilles dans l’Etat du Paraná et dans la région Nord-Est du Brésil, sous un regard ethnolinguistique. Le corpus est composé par les donnés obtenues à partir de la question numéro 276 du Questionnaire Semantique-Lexical de l’Atlas Linguistique du Paraná (ALPR, dont l’auteur est le professeur Vanderci de Andrade Aguilera (1994, de l’Université de l’Etat de Londrina, autant que les variantes lexicales pour le mot espadrilles trouvées dans deux ouvrages littéraires d’auteurs originaires du Nord-Est du Brésil – Fogo Morto, de José Lins do Rego (2009 et Vidas Secas, de Graciliano Ramos (1969. Dans ces livres, les espadrilles jouent un rôle fondamental, tout en reflétant son importance dans le vestiaire de cette région, du moins jusqu’à moitié du XXème siècle. On rechercha des éventuelles ressemblances ou différences existentes entre les variantes lexicales de la chaussure mentionnée par les informateurs “paranaenses” et le modèle cité dans les ouvrages des écrivains Rego et Ramos. Dans les deuxs sources – la linguistique et la littéraire – on privilégia l’analyse semantique des unités lexicales et le contexte dans lequel elles ont été enregistrées. L’étude démontra que l’unité lexicale espadrilles et ses variantes phonétiques similaires dans les deux corpora, aussi que les variantes lexicales populaires présentes dans l’Atlas Linguistique du Paraná (ALPR. En dépit des simitudes l’esthétique et la fonction des espadrilles ne sont pas les mêmes dans les localitées concernées.

  7. Femmes, migration et droits au Mali et au Sénégal | IDRC ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Cette subvention permet au Groupe de recherche sur les femmes et les lois au Sénégal (GREFELS) de lever ces insuffisances. Les chercheurs vont analyser des stratégies migratoires des jeunes filles et des femmes dans les deux pays, étudier les conditions de travail des travailleuses domestiques au Sénégal, ...

  8. Exposition au manganèse dans la population générale d'une région ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Lors de la première phase du projet (100662), les chercheurs ont étudié la dynamique du manganèse dans l'écosystème et ses effets neurologiques sur la population adulte dans les collectivités locales. Grâce à leurs travaux, on a été en mesure d'établir un lien important entre les concentrations élevées de manganèse ...

  9. Radon-Instrumentation

    International Nuclear Information System (INIS)

    Moreno y Moreno, A.

    2003-01-01

    The presentation of the active and passive methods for radon, their identification and measure, instrumentation and characteristics are the objectives of this work. Active detectors: Active Alpha Cam Continuous Air Monitor, Model 758 of Victoreen, Model CMR-510 Continuous Radon Monitor of the Signature Femto-Tech. Passive detectors: SSNTD track detectors in solids Measurement Using Charcoal Canisters, disk of activated coal deposited in a metallic box Electrets Methodology. (Author)

  10. Radon in housing

    International Nuclear Information System (INIS)

    1984-04-01

    The enclosed material deals with the substantial efforts made until now to control the levels of radon in Sweden dwellings. It is meant as a source material for the several publications which have emerged from the National Institute of Radiation Protection in Stockholm during 1983 and 1984. The first document is a translation of chapter 16, the deliberations of the Swedish Radon Commission, appointed by the government in 1979. Comments on the report of the commission were solicited before 1 October, 1983. (author)

  11. Radon in Croatian spas

    International Nuclear Information System (INIS)

    Radolic, V.; Vukovic, B.; Planinic, J.

    2004-01-01

    There are ten thermal spas in Croatia and all of them provide health services for patients and visitors. Radon measurements were performed since there is a lack of data concerning natural radioactivity originated from radon and its short-lived progenies in such environments. The thermal water at two different sites (the indoor swimming pool with geothermal water and the spring) in each spa was sampled and radon concentrations were measured by AlphaGUARD radon measuring system. The obtained values were in the range of 0.7 to 19 Bq.dm -3 and 2 to 94 Bq.dm -3 for indoor swimming pools and springs, respectively. Integrated measurements of radon concentration in air were performed by two solid state nuclear track detectors LR-115 II (open and diffusion one) thus enabling estimation of equilibrium factor between radon and its daughters. The annual effective doses received by spa workers were found to be about 1 mSv/y (below the lower limit value of 3 mSv/y recommended by ICRP 65). The doses of patients and visitors were one or two order of magnitude lower than that of the personnel. (author)

  12. Radon og boligen

    DEFF Research Database (Denmark)

    Rasmussen, Torben Valdbjørn

    Radon er en radioaktiv og sundhedsskadelig luftart, som ved indånding øger risikoen for lungekræft. Der er ingen dokumenteret nedre grænse for, hvornår radon er ufarligt. Derfor anbefales det, at man tilstræber et så lavt radonindhold i indeluften som muligt. Man kan hverken lugte, se, høre eller...... smage radon, så vil du vide, om du har radon i din bolig, må du måle radonindholdet i indeluften. Radon forekommer naturligt i jorden og kan suges ind sammen med jordluft, hvis der inde er et undertryk, og hvis konstruktionerne mod jord er utætte. Jordluft trænger ind gennem revner og utætte samlinger......, fx omkring rør til kloak, vand og varmeforsyning. Koncentrationen af radon i jorden varierer meget fra sted til sted, også lokalt og gennem året. Tidligere undersøgelser har vist, at der kan forekomme høje koncentrationer i Sydgrønland, specielt i området syd for Narsalik ved Paamiut, 61°30’N....

  13. Contribution to the study of stimulated emission in neodymium-doped glass; Contribution a l'etude de l'emission stimulee dans le verre dope au neodyme

    Energy Technology Data Exchange (ETDEWEB)

    Jego, J.M. [Commissariat a l' Energie Atomique, Limeil-Brevannes (France). Centre d' Etudes; Faculte des Sciences de Rennes, 35 (France)

    1969-07-01

    faut attendre cependant quelques quarante annees pour voir les premieres realisations. Le maser fonctionnant dans le domaine des ondes micrometriques apparait en 1954. Dans le domaine optique, le premier 'LASER' est realise par MAIMAN en 1960. L'atome actif etait le chrome au sein d'une matrice d'alumine (rubis). le monocristal fluorescent etait place entre deux reflecteurs charges de maintenir dans le mileu une inversion provoquee de population jusqu'a atteindre les conditions d'emission. L'effet laser a permis de realiser beaucoup de generateurs de raies (plusieurs centaines) couvrant la gamme optique avec les mileux tant gazeux que liquides ou solides. Parmi ceux ci, le neodyme presente une transition entre les niveaux 4 F{sub 3/2} et 4 I{sub 11/2} qui a permis la realisation de lasers de tres grande puissance. Ce travail etudie les conditions de formation d'une impulsion declenchee et de son amplification dans le verre dope au neodyme. Des mesures precises des divers rendements interessants dans ces processus nous ont permis de connaitre la valeur de l'inversion de population realisee dans le milieu et d'etudier le detail de l'emission stimulee. (auteur)

  14. Évolution de la fécondabilité des ovules de truite arc-en-ciel (Salmo gairdneri laissés dans la cavité abdominale au cours de la période post-ovulatoire

    Directory of Open Access Journals (Sweden)

    ESCAFFRE A. M.

    1979-01-01

    Full Text Available L'évolution de la fécondabilïté des ovules de Truite arc-en-ciel laissés dans la cavité abdominale au cours de la période post-ovulatoire a été étudiée, sur trois populations différentes (P, G et K, en relation avec quelques caractéristiques relevées sur les femelles : date de ponte, âge, poids du corps, variation du poids individuel des ovules au cours de la période de rétention. La survie des ovules laissés dans la cavité générale après ovulation dépend des populations étudiées ; la fécondabilité se maintient au-dessus de 90 % pendant 8 jours dans la population K et 15 jours dans les populations P et G, et elle est indépendante du poids du corps des femelles et du poids moyen des ovules. Par contre, la diminution de l'aptitude à la fécondation des ovules peut être mise en relation avec leur variation de poids et leurs modifications morphologiques au cours de leur séjour intra-abdominal.

  15. Control of indoor radon and radon progeny concentrations

    Energy Technology Data Exchange (ETDEWEB)

    Sextro, R.G.

    1985-05-01

    There are three general categories of techniques for the control of radon and radon progeny concentrations in indoor air - restriction of radon entry, reduction of indoor radon concentrations by ventilation or air cleaning, and removal of airborne radon progeny. The predominant radon entry process in most residences appears to be pressure driven flow of soil gas through cracks or other openings in the basement, slab, or subfloor. Sealing these openings or ventilation of the subslab or subfloor space are methods of reducing radon entry rates. Indoor radon concentrations may be reduced by increased ventilation. The use of charcoal filters for removal of radon gas in the indoor air by adsorption has also been proposed. Concentrations of radon progeny, which are responsible for most of the health risks associated with radon exposures, can be controlled by use of electrostatic or mechanical filtration. Air circulation can also reduce radon progeny concentrations in certain cases. This paper reviews the application and limitations of each of these control measures and discusses recent experimental results.

  16. Control of indoor radon and radon progeny concentrations

    International Nuclear Information System (INIS)

    Sextro, R.G.

    1985-01-01

    There are three general categories of techniques for the control of radon and radon progeny concentrations in indoor air -- restriction of radon entry, reduction of indoor radon concentrations by ventilation or air cleaning, and removal of airborne radon progeny. The predominant radon entry process in most residences appears to be pressure driven flow of soil gas through cracks or other openings in the basement, slab, or subfloor. Sealing these openings or ventilation of the subslab or subfloor space are methods of reducing radon entry rates. Indoor radon concentrations may be reduced by increased ventilation. The use of charcoal filters for removal of radon gas in indoor air by adsorption has also been proposed. Concentrations of radon progeny, which are responsible for most of the health risks associated with radon exposures, can be controlled by use of electrostatic or mechanical filtration. Air circulation can also reduce radon progeny concentrations in certain cases. This paper reviews the application and limitations of each of these control measures and discusses recent experimental results

  17. Prévalence et rôle des lipides dans l'avènement de l'obésité au Bénin

    African Journals Online (AJOL)

    Le recueil des mesures anthropométriques des étudiants de l'Institut National Médico-Social (INMES) au Bénin nous a permis de calculer l'Indice de Masse Corporelle de cette population, seul indicateur pour évaluer l'état nutritionnel des adultes de point de vue énergétique. Au terme de cette évaluation, il ressort que la ...

  18. Radon in the workplace

    International Nuclear Information System (INIS)

    Scivyer, C.R.; Gregory, T.J.

    1995-01-01

    This Guide has been prepared for the Health and Safety Executive (HSE) by the Building Research Establishment (BRE). Following the guidance is not compulsory and you are free to take other action. However if you do follow the guidance you will normally be doing enough to comply with the law. Health and Safety Inspectors seek to secure compliance with the law and may refer to this guidance as illustrating good practice. In the past, concern about exposure of employees to radon has largely centred on the mining environment. In recent times, with increased knowledge and mapping of radon levels in homes, attention has increasingly turned to radon exposure in buildings used for work purposes. Now there is a considerable fund of information to show that employees in some buildings can receive very significant radiation doses from radon. Surveys show that levels of radon tend to be higher in buildings with small rooms, such as offices rather than larger factory and warehouse constructions. The particular problem is that the nature of the work process gives no clue as to the radon hazard that may exist, and the employer may be unaware of its presence and how to deal with it. This Guide is aimed principally at employers and those who control buildings used for work purposes, or their representatives. It offers guidance on practical measures for reducing radon levels in workplaces. The guidance should also be of interest and assistance to those, such as surveyors and builders, concerned with specifying and carrying out the necessary remedial measures. Advice is provided for the majority of building types and construction situations likely to be encountered in larger non-domestic buildings. For buildings where construction is similar to that found in dwellings the guidance published by BRE on remedial measures for dwellings should be used. BRE prepared this Guide with assistance from the National Radiological Protection Board (NRPB) and Cornwall County Council under contract

  19. Radon-in-breath measurement

    International Nuclear Information System (INIS)

    Leach, V.A.

    1981-01-01

    A review of literature on the area of radon breath measurements has shown that respiratory factors have been largely ignored. The history of breathing room-air radon concentrations and the variations in respiratory parameters for each individual have been the major contributing factors for poor reproducibility in radon breath measurements performed by past researchers

  20. L'événementiel "agriculturel" en Rhône-Alpes : Au croissement des ressources agricoles et des ressources culturelles dans les territoires

    OpenAIRE

    Landel, Pierre-Antoine; Delfosse, Claire; Canova, Nicolas; Robinet, Nicolas; Caritey, Pierre

    2008-01-01

    Réaliser une étude sur les fêtes agriculturelles revêt un caractère particulier dans la mesure où c'est un domaine relativement peu étudié. A la croisée des chemins entre culture et agriculture, ces événements sont des objets complexes et difficiles à appréhender. Le regard du géographe est quelque peu perdu dans l'étude des fêtes tant la production scientifique géographique est à la marge dans la discipline. Hormis l'ouvrage de référence de Guy Di Méo , seuls quelques articles font état de l...

  1. Le positionnement stratégique des acteurs dans la prise en compte des risques psychosociaux au travail. Le cas des cabinets-conseil spécialisés en prévention des RPS

    OpenAIRE

    Tarik Chakor

    2012-01-01

    Ce document a été rédigé à l'occasion d'un séminaire de thèse se déroulant le 4/6/12 au LEST-CNRS (UMR 7317, Aix-en-Provence). Son objectif est de présenter un état d'avancement sur la réflexion autour du rôle des cabinets-conseil dans la prévention des RPS. L'analyse des RPS comme un phénomène potentiellement conflictuel et stratégique, notamment à partir de la multiplicité des approches disciplinaires, permet de mettre en évidence différents positionnements stratégiques des cabinets, du cab...

  2. Réseau de la finance solidaire et responsable au QuébecCo-construction d’un champ institutionnel dans l’écosystème d’économie sociale et solidaire

    OpenAIRE

    Zerdani, Tassadit; Bouchard, Marie J.

    2016-01-01

    Cet article montre le rôle des acteurs et de leurs regroupements dans l’émergence et le développement d’un écosystème de l’économie sociale et solidaire à travers l’analyse du cas du secteur de la finance solidaire et responsable au Québec et du réseau que forment certains de ses acteurs. En se basant sur les données d’une étude longitudinale, l’article décrit les principaux acteurs du secteur et analyse le processus d’institutionnalisation de leur réseau. Ce cas illustre comment les actions ...

  3. L'image de l'autre au Moyen Age. La représentation du monde rural dans le Guide du pèlerin de Saint-Jacques de Compostelle

    OpenAIRE

    Filhol, Emmanuel

    2009-01-01

    Le discours tenu au XIIe siècle par l'auteur du Guide sur le monde rural révèle les images stéréotypées que l'Église et les hommes de religion se font des paysans. Dans sa description des populations rurales du sud-ouest de la France et du nord de l'Espagne, Aimery Picaud accumule une série de poncifs et de préjugés aussi grotesques qu'humiliants. Le paysan y est dépeint sous des traits péjoratifs qui l'affublent de vices et de défauts : laid, méchant, inculte, barbare, luxurieux. Cette image...

  4. Radon -- an environmental hazard

    International Nuclear Information System (INIS)

    Faheem, M.; Rahman, R.; Rahman, S.; Matiullah

    2005-01-01

    Humans have always been exposed throughout its period of experience to naturally occurring sources of ionizing radiation or natural background radiation, It is an established fact that even these low background doses are harmful to man and cause increased cancer risk. About half of our radiation comes from radon, a radioactive gas coming from normal materials in the ground. Several building materials such as granite, bricks, sand, cement etc., contain uranium in various amounts. The radioactive gas /sup 222/Rn produced in these materials due to decay of 226Ra is transported to indoor air through diffusion and convective flow. It seeps out of soil and rocks, well water, building materials and other sources at a varied rate. Amongst the naturally occurring radioisotopes, radon is the most harmful one that can be a cause of lung cancer. Radon isotopes are born by the decay of radium and radium production in turns comes from uranium or thorium decay. For humans the greatest importance among Radon isotopes is attributed to /sup 222/Rn because it is the longest lived of the three naturally produced isotopes. Drinking water also poses a threat. Radon gas is dissolved in water and is released into the air via water faucets, showerheads, etc. the lack of understanding has so far lead to speculative estimates of pollutant related health hazards. (author)

  5. Passive personal radon dosemeter

    International Nuclear Information System (INIS)

    Djeffal, S.; Allab, M.

    1993-01-01

    The dosimetry laboratory of the Radiation Protection and Safety Centre in Algiers has developed a passive integrating radon personal dosemeter. This dosemeter is designed to be used in atmospheres where high humidity is present such as in mines. It also excludes radon progeny, thoron and its decay products and detritus through a filter membrane. It has the advantages of being simple, cheap and robust. Based on the diffusion principle, it consists of an enclosed small sized chamber into which radon diffuses and which contains a track detector for the registration of alpha particles. The number of alpha particle tracks recorded is proportional to the time integral of the radon gas concentration external to the dosemeter. Theoretical studies were undertaken to determine the optimum dimensions of the diffusion chamber. The dosemeter response was studied by varying the volume and the shape of the chamber and the filter membrane thickness. The diffusion chamber adopted consists of a cylindrical aluminium container of approximate height 4 cm and diameter 3 cm. The reproducibility of the dosemeter response has also been tested. The calibration of these passive personal radon dosemeters was performed at the National Radiological Protection Board (Harwell, UK) and the resulting sensitivity factor is about 2.5 and 1.6 tracks.cm -2 per kBq.m -3 .h for the detectors counted by means of an optical microscope and a spark counter respectively. (Author)

  6. Stabilisation en pression et en température du champ magnétique dans le piège à ions de précision d’ISOLTRAP au CERN

    CERN Document Server

    MARIE-JEANNE, M; BAN, G

    2005-01-01

    L’expérience ISOLTRAP, à ISOLDE au CERN, utilise la mesure de la fréquence cyclotron dans un piège de Penning pour en déduire avec une haute précision la masse des ions radioactifs produits par l’installation ISOLDE. Pour cette mesure de masse, une bonne homogénéité du champ magnétique au cours du temps est requise dans le piège. Or l’étude de l’erreur systématique a montré l’existence d’une dérive du champ magnétique en fonction du temps, à laquelle se superposent des fluctuations dépendant de la température. La courbe de dérive linéaire en fonction du temps ayant été évaluée, on souhaite mettre en place un système de régulation permettant d’atténuer les fluctuations du champ magnétique liées aux variations de la température. Ce dispositif constituera une amélioration technique pouvant conduire à la réduction de l’erreur systématique sur la mesure de masse. Ce rapport détaille l’installation d’un système de régulation de la pression de l’hélium ser...

  7. Measurements of indoor radon and radon progeny in Mexico City

    International Nuclear Information System (INIS)

    Cheng, Y.S.; Rodriguez, G.P.

    1996-01-01

    Indoor radon has been a public concern associated with increased lung cancer risks. Radon decay products interact with indoor aerosols to form progeny with different size distributions, which may influence the lung dosimetry when the progeny are inhaled. Air pollution in Mexico City is a serious problems with high particulate concentrations, but there are few reports of indoor radon measurement. The purposes of this study were to measure the aerosol concentration, radon concentration, and radon activity size distribution in the living area of three houses in Mexico City. The radon concentration was monitored by a RGM-3 radon gas monitor (Eberline, Inc., Santa Fe, NM). A graded diffusion battery was used to determine the progeny concentration and activity size distribution. The concentration and size distribution of the indoor aerosols were monitored by a quartz, crystal microbalance cascade impactor. Our measurements showed high concentrations of indoor aerosols (20-180 gg m -3 ). However, the radon concentrations-were low ( -1 ), but showed a clear diurnal pattern with peak concentrations from 2-10 AM. The activity size distributions of radon progeny were trimodal, with peaks of 0.6 nm, 4-5 nm, and 100 rim. Most activities were associated with large particle sizes. Our results indicated that indoor radon concentration was not high, due in part to a relatively high air exchange with outdoor air. The high aerosol concentration may also play an important part in the activity size distribution of radon progeny

  8. Faible taux de succes du sevrage tabagique a court et moyen termes au decours d�un infarctus aigu du myocarde dans un service de cardiologie de Dakar au Senegal

    Directory of Open Access Journals (Sweden)

    Alassane Mbaye

    2011-10-01

    Full Text Available e le tabac pendant l�hospitalisation. Apres un suivi de 3 mois, 45% des patients ont repris le tabac, 65% a 6 mois et 85% a 12 mois. CONCLUSION: Le tabagisme est assez frequent chez les patients senegalais presentant un infarctus du myocarde. Le taux de sevrage tabagique a court et moyen termes est faible. Le sevrage tabagique devrait alors constituer un objectif privilegie dans la prevention des maladies cardio-vasculaires.

  9. Comprendre l'influence des facteurs contextuels sur la participation communautaire à la santé : une étude de cas dans le district sanitaire de Tenkodogo, au Burkina Faso.

    Science.gov (United States)

    Sombié, Issa; Ilboudo, David O S; Soubeiga, André Kamba; Samuelsen, Helle

    2017-09-01

    Le Burkina Faso met en œuvre depuis plusieurs années la stratégie de la participation communautaire. Des comités de gestion (CoGes) ont été mis en place dans les centres de santé de la première ligne et doivent participer aux prises de décisions. L'objectif principal de cette stratégie est de favoriser l'utilisation des services de santé et une adhésion massive des communautés aux activités de promotion de la santé. Seulement, on constate que les résultats escomptés par les autorités sanitaires tardent à se réaliser. Le présent article convoque les facteurs liés au contexte socioculturel du district sanitaire, pour analyser le phénomène de la participation communautaire. L'étude s'est déroulée dans le district sanitaire de Tenkodogo, situé dans la région administrative du Centre-est, à environ 190 km de la capitale. Cette étude exclusivement qualitative, a utilisé deux méthodes de collecte : les entretiens individuels et les focus groups. Les participants à l'étude sont les chefs de ménage ( n = 48), les membres des CoGes ( n = 10), les agents de santé ( n = 8) et les agents de santé communautaire ( n = 24). La méthode de l'analyse de contenu a été utilisée pour l'analyse des données. Les résultats de l'étude montrent que plusieurs facteurs socioculturels influencent la dynamique de la participation communautaire dans le district. Ce sont les conditions économiques, la perception négative des services de santé, les inégalités sociales de sexe et d'âge, le faible ancrage social des organisations communautaires, les rivalités inter-villages et les conflits coutumiers. L'étude relève également que les communautés ne perçoivent pas leur implication dans le processus décisionnel des services de santé comme une priorité. Leurs principales attentes s'orientent vers la disponibilité de soins de qualité et à coût réduit.

  10. The householders' guide to radon

    International Nuclear Information System (INIS)

    1988-06-01

    This guide is a follow-up to the leaflet Radon in Houses which was issued previously by the Department of the Environment. It is intended for people who live in areas with high levels of radon. It is written particularly for householders whose homes have already been tested and found to have an appreciable level of radon. It explains what radon is, how it gets into houses and what the effects on health may be. It also outlines some of the ways of reducing the level of radon and gives guidance both on how to get the work done and likely costs. (author)

  11. Enseigner la Francophonie dans les cours de Français Langue Seconde au niveau universitaire : expériences et défis

    Directory of Open Access Journals (Sweden)

    Sébastien Sacré

    2013-11-01

    Full Text Available En cette époque de mondialisation, la mise en valeur des cultures minoritaires est, dans les milieux universitaires, de plus en plus importante. Cependant, ce développement d’une conscience culturelle est bien moins évidents dans le cadre de cours de langue, dont objectif principal n’est pas l’apprentissage d’une culture, mais celui d’une langue-cible. Ainsi, les langues et leurs cultures associées ont beau être indissociables par nature, il est cependant les enseigner séparément. Enseigner la langue en ne parlant de culture que superficiellement n’est cependant pas sans conséquences et il n’est pas rare de remarquer, dans manuels de langue par exemple, une représentation superficielle, voire stéréotypée du monde. Comment peut-on conjuguer l’apprentissage d’une langue à celui de ses richesses culturelles ? Basé sur des expériences d’enseignement et sur de récents manuels d’apprentissage, cet article se proposera d’analyser les difficultés et les défis de l’intégration d’éléments culturels dans des cours de type Français Langue Seconde.

  12. Du Style pour dire non, ou l’artillerie d’une poétique de combat dans Cahier d’un Retour au Pays Natal d’Aimé Césaire

    Directory of Open Access Journals (Sweden)

    Clotaire Saah Nengou

    2013-05-01

    Full Text Available Malgré les divers thèmes étudiés par des générations d’écrivains d’Afrique et de la diaspora noire francophone, la plupart de leurs œuvres ne reflète souvent que très timidement une forme esthétique hardie; serait-ce par peur de faire la différence? Par contre le poète Aimé Césaire ose. Dans son poème Cahier d’un Retour au Pays Natal, Césaire fait du signe une arme stylistique et insurrectionnelle pour combattre la norme culturelle tyrannique imposée à sa conscience, combattre les oppresseurs d’hommes et les larbins de la révolte. Soit le “style pour dire non!” La présente étude voudrait montrer que l’expressivité chez Césaire dans cet inusable, long et délirant texte poétique, c’est de l’artillerie lourde qui se caractérise par l’usage quantitatif, qualitatif et volumique d’éléments linguistiques, sortes d’obus donnant vitalité aux idées et violence aux signifiants.

  13. Speak Medicine Inc.! : Enjeux éthiques et politiques du travail des infirmières praticiennes dans les Groupes de médecine de famille au Québec

    Directory of Open Access Journals (Sweden)

    Geneviève McCready

    2018-03-01

    Full Text Available Le recours aux infirmières praticiennes spécialisées est présenté comme une avenue prometteuse pour faire face aux défis de santé contemporains et limiter l’accroissement des dépenses. Leur arrivée dans le système québécois est récente et empreinte d’obstacles. Cet article examine les conditions éthiques et politiques du travail des infirmières praticiennes de première ligne dans les Groupes de médecine de famille du Québec, à partir de la lentille épistémique des écrits de Boaventura de Sousa Santos. La sociologie des absences fait ressortir les difficultés de mise en pratique de la diversité des savoirs infirmiers, en particulier les savoirs éthiques et communautaires, en raison d’une posture de sous-traitante au médecin. La sociologie des émergences permet d’imaginer des pistes émancipatrices: le développement d’actions communautaires comme gage de pratique alternative, le renforcement de la sensibilité éthique en tant que moteur de changement interne, et la possibilité de collectiviser le pouvoir à partir d’une base dialectique.

  14. Radon daughter dosimeter

    International Nuclear Information System (INIS)

    Durkin, J.

    1977-01-01

    This patent describes a portable radon daughter dosimeter unit used to measure radon gas alpha daughters in ambient air. These measurements can then be related to preselected preestablished standards contained in a remote central readout unit. The dosimeter unit is adapted to be worn by an operator in areas having alpha particle radiation such as in uranium mines. Within the dosimeter is a detector head housing having a filter head and a solid state surface barrier radiation detector; an air pump to get air to the detector head; a self contained portable power supply for the unit; and electronic circuitry to process detected charged electrons from the detector head to convert and count their pulses representatives of two alpha radon emitter daughters. These counted pulses are in binary form and are sent to a readout unit where a numerical readout displays the result in terms of working level-hours

  15. Radon daughter dosimeter

    International Nuclear Information System (INIS)

    Durkin, J.

    1977-01-01

    A portable radon daughter dosimeter unit used to measure Radon gas alpha daughters in ambient air is described. These measurements can then be related to preselected preestablished standards contained in a remote central readout unit. The dosimeter unit is adapted to be worn by an operator in areas having alpha particle radiation such as uranium mines. Within the dosimeter is a detector head housing having a filter head and a solid state surface barrier radiation detector; an air pump to get air to the detector head; a self contained portable power supply for the unit; and electronic circuitry to process detected charged electrons from the detector head to convert and count their pulses representatives of two alpha radon emitter daughters. These counted pulses are in binary form and are sent to a readout unit where a numerical readout diplays the result in terms of working level-hours

  16. Radon: a bibliography

    Energy Technology Data Exchange (ETDEWEB)

    Lepman, S.R.; Boegel, M.L.; Hollowell, C.D.

    1981-01-01

    The Lawrence Berkeley Laboratory, with the support of the Department of Energy, has developed a computerized database to manage research information in the area of building ventilation and indoor air quality. This literature survey contains references pertaining to the physical properties of radon and its daughters, instrumentation for their measurement, health effects, surveys and measurements, and regulatory information. The references in the bibliography are sequenced in alphabetical order and abstracts are included when supplied by the author. The objective of this report is to disseminate the bibliographic references compiled at the laboratory relating to radon research portion of the program. Interested database users are encouraged to contact the laboratory to receive instructions for direct database acess. A flyer describing the database is supplied at the end of the bibliography and a brief overview of the Radon Research porgram is given.

  17. Water radon anomaly fields

    Energy Technology Data Exchange (ETDEWEB)

    Yin, H.

    1980-01-01

    A striking aspect of water radon levels in relation to earthquakes is that before the Tangshan quake there was a remarkable synchronicity of behavior of many wells within 200 km of Tangshan. However, for many wells anomalous values persisted after the earthquake, particularly outside the immediate region of the quake. It is clear that radon may be produced by various processes; some candidates are pressure, shear, vibration, temperature and pressure, mixing of water-bearing strata, breakdown of mineral crystal structure, and the like, although it is not clear which of these are primary. It seems that a possible explanation of the persistence of the anomaly in the case of Tangshan may be that the earthquake released strain in the vicinity of Tangshan but increased it further along the geological structures involved, thus producing a continued radon buildup.

  18. Dry radon gas generator

    International Nuclear Information System (INIS)

    Vandrish, G.

    1979-10-01

    A radon gas standard with a source strength of 120037 pCi capable of delivering 121 pCi of radon gas successively to a large number of cells has been developed. The absolute source strength has been calibrated against two radium solution standards and is accurate to 4 percent. A large number of cells (approxiiately 50) may be calibrated conveniently on a daily basis with appropriate corrections for sequential changes in the amount of gas delivered, and a correction for the growth of radon in the standard on successive days. Daily calibration of ten cells or less does not require these corrections. The standard is suitable for field use and the source emanation rate is stable over extreme temperatue and pressure ranges and over six months

  19. Alpha scintillation radon counting

    International Nuclear Information System (INIS)

    Lucas, H.F. Jr.

    1977-01-01

    Radon counting chambers which utilize the alpha-scintillation properties of silver activated zinc sulfide are simple to construct, have a high efficiency, and, with proper design, may be relatively insensitive to variations in the pressure or purity of the counter filling. Chambers which were constructed from glass, metal, or plastic in a wide variety of shapes and sizes were evaluated for the accuracy and the precision of the radon counting. The principles affecting the alpha-scintillation radon counting chamber design and an analytic system suitable for a large scale study of the 222 Rn and 226 Ra content of either air or other environmental samples are described. Particular note is taken of those factors which affect the accuracy and the precision of the method for monitoring radioactivity around uranium mines

  20. Radon: a bibliography

    International Nuclear Information System (INIS)

    Lepman, S.R.; Boegel, M.L.; Hollowell, C.D.

    1981-01-01

    The Lawrence Berkeley Laboratory, with the support of the Department of Energy, has developed a computerized database to manage research information in the area of building ventilation and indoor air quality. This literature survey contains references pertaining to the physical properties of radon and its daughters, instrumentation for their measurement, health effects, surveys and measurements, and regulatory information. The references in the bibliography are sequenced in alphabetical order and abstracts are included when supplied by the author. The objective of this report is to disseminate the bibliographic references compiled at the laboratory relating to radon research portion of the program. Interested database users are encouraged to contact the laboratory to receive instructions for direct database acess. A flyer describing the database is supplied at the end of the bibliography and a brief overview of the Radon Research porgram is given

  1. La question de la langue dans les milieux des savants grecs au xixe siecle : projets linguistiques et réformes

    Directory of Open Access Journals (Sweden)

    Petros Diatsentos

    2010-06-01

    Full Text Available Thèse en Histoire et Civilisation soutenue le 15 mai 2009 sous la direction de Georges Dertilis Membres du jury : Monsieur Sylvain Auroux, Directeur de recherche au CNRS (Laboratoire d’histoire des théories linguistiques, Rapporteur,Monsieur Georges Drettas, Directeur de recherche au CNRS (Laboratoire de langues et civilisations à tradition orale, Examinateur, Madame Marie - Elisabeth Mitsou, Professeur à l'Université de Munich (Institut für Byzantinistik, Byzantinische Kunstgeschichte und ...

  2. L’efficacité du conseil d’administration dans les sociétés anonymes au Cameroun: Une lecture par l’hétérogénéité des administrateurs

    Directory of Open Access Journals (Sweden)

    Georges Kriyoss Mfouapon

    2013-12-01

    Full Text Available Le but de cet article est d’analyser l’effet de l’homogénéité ou de l’hétérogénéité du profil des administrateurs sur l’efficacité de leur conseil d’administration (CA. Les données analysées sont collectées auprès de 386 administrateurs répartis sur un échantillon de 64 CA des sociétés anonymes (SA installées au Cameroun. Les résultats obtenus indiquent que l’homogénéité socioprofessionnelle, de l’indépendance et clanique du CA sont d’une influence notable sur leur efficacité. Ces résultats montrent, en fait que, l’hétérogénéité du CA est source d’efficacité supérieure dans les choix stratégiques, et d’inefficacité dans les opérations de contrôle et de surveillance de l’équipe dirigeante. Ces résultats s’inscrivent dans la même perspective que les travaux d’Hambrick & Mason (1984 sur la Upper Echelons Research, la théorie de la régulation clanique d’Ouchi (1980 et constituent en même temps une confirmation des résultats de Jensen (1993.

  3. Une nouvelle orientation dans l’enseignement supérieur au vietnam: de la mémoire à la résolution de problèmes

    Directory of Open Access Journals (Sweden)

    TRƯƠNG Quang Dũng

    2016-12-01

    Full Text Available L’enseignement supérieur traditionnel est essentiellement basé sur la transmission du savoir et occasionnellement sur celle du savoir-faire. Il se réclame donc des disciplines universitaires (mathématiques, physique, chimie, géologie.... dispensées dans les universités et grandes écoles. Or, la réussite professionnelle et sociale dans le monde moderne exige d’autres acquis plus probants que des connaissances pures. Plusieurs recherches récentes ont ainsi montré que la résolution de bien des problèmes requiert des qualités pragmatiques d’efficacité indispensables pour l’accomplissement d’un travail créatif. Résoudre un problème revient alors à apprendre à maitriser une démarche méthodique composée de plusieurs phases, depuis l’identification du problème jusqu’à sa solution finale en passant par l’analyse judicieuse des causes. Il faut également maîtriser l’utilisation d’outils conceptuels et Méthodologiques tels que, entre autres, la « loi de Pareto », le questionnement systématique et le brainstorming . Au Vietnam on peut espérer la mise en application de ces nouvelles orientations dans un enseignement supérieur qui doit absolument se fixer comme objectif d’améliorer la qualité du travail social pour répondre aux nouvelles exigences de développement du pays.

  4. Determination of the radon Concentration in underground water in selected areas in and around Kumasi

    International Nuclear Information System (INIS)

    Owusu, Seth Adjei

    2012-06-01

    Radon (Rn-222) is a radioactive noble gas of natural origin that may be found anywhere in soil, air and different types of water: surface, borehole, well and spring. It is worth to carry out surveys for the radon in water for radiation protection as well as for geological considerations. The research presenters here was carried out in selected towns in and around Kumasi for the determination of radon concentration in groundwater. The major towns from which samples were taken are , Mowire, Kronum, Aburaso, Medoma, Kenyase, Buokrom, Bomfa, Ayeduase, Kotei, Tikrom. All the samples are used for domestic purposes such as cooking, drinking, bathing and washing. Waters from boreholes and wells in the selected towns were sampled and the radon concentration level measured. The Roll’s method was used for the radon concentration analysis on all the 100 samples. The results shows that, the minimum radon concentration in groundwater was 13015.934 Bq/m3 and it was found at Bomfa, and the highest was found to be 964628.480 Bq/m3, recorded at Mowire. It is believed that this variation of levels is mainly due to the difference in rock type, soil type and geology of the area as well as the depth of the water samples. This information can be used to estimate the possible health hazards from radon in the selected towns in the future from environmental point of view. The data would promote public awareness related to risk of radon exposure. (au)

  5. Project radon final report

    International Nuclear Information System (INIS)

    Ekholm, S.; Rossby, U.

    1990-01-01

    The main radiation problem in Sweden is due to radon in dwellings. At the Swedish State Power Board, R, D and D about radon has been going on since 1980. The work has concentrated on the important questions: How to find building with enhanced radon levels?; How to accurately decide on measures that will give adequate cleaning-up results, using appropriate measurement procedures; What cleaning-up effect is possible to achieve with an electro-filter?; and What cleaning-up effects are possible to achieve with different types of ventilation systems? The R, D and D-work, has been pursued in cooperation with universities of technology in Denmark and Finland, equipment manufacturers, consultants and authorities concerned. It was decided in December 1986 to give an offer to some SSPB-employees to investigate the radon situation of their dwellings, in order to test methods of measurement and cleaning-up under realistic conditions and to develop the methods to commercial maturity. The investigation was named 'Project Radon' and was carried out in three years with costs amounting to 1 M dollars. During the project less comprehensive radon measurements, named 'trace-measurements' were undertaken in about 1300 dwellings and more elaborate measurements, leading to suggestions of actions to be taken, in about 400 dwellings. Out of the suggestions, about 50 are carried out including control measurement after actions taken. The control measurement have shown that the ability to suggest appropriate actions is very successful - in just one case was a minor additional action necessary. The high reliability is achieved by always doing elaborate measurements before suggested mitigation method is decided on. (authors)

  6. Radon Research Program, FY 1991

    International Nuclear Information System (INIS)

    1992-03-01

    The scientific information being sought in this program encompasses research designed to determine radon availability and transport outdoors, modeling transport into and within buildings, physics and chemistry of radon and radon progeny, dose response relationships, lung cancer risk, and mechanisms of radon carcinogenesis. The main goal of the DOE/OHER Radon Research Program is to develop information to reduce these uncertainties and thereby provide an improved health risk estimate of exposure to radon and its progeny as well as to provide information useful in radon control strategies. Results generated under the Program were highlighted in a National Research Council report on radon dosimetry. The study concluded that the risk of radon exposure is 30% less in homes than in mines. This program summary of book describes the OHER FY-1991 Radon Research Program. It is the fifth in an annual series of program books designed to provide scientific and research information to the public and to other government agencies on the DOE Radon Research Program

  7. Mise en pratique du schéma 2BSvs dans le groupe industriel Sofiprotéol : étude de cas sur toute la filière (de l’agriculteur au pétrolier

    Directory of Open Access Journals (Sweden)

    Guizouarn Kristell

    2015-01-01

    Full Text Available Pour réduire sensiblement les émissions de CO liées aux transports routiers, l’Union européenne mise sur le développement des biocarburants, en respectant des conditions de durabilité. Afin de répondre à cette obligation et d’être en mesure de démontrer la conformité du biodiesel à ces critères, depuis l’agriculteur jusqu’au distributeur pétrolier, la filière des oléagineux a engagé la rédaction d’un schéma de vérification volontaire : 2BSvs, pour Biomasse Biocarburant Schéma volontaire sur la durabilité. Reconnu par la Commission Européenne le 19 juillet 2011, le schéma 2BSvs couvre l’ensemble de la chaîne de production des biocarburants, du producteur de biomasse à l’entrée dans un entrepôt sous douanes. À travers une étude de cas sur toute la filière, de l’agriculteur au pétrolier, cet article présente les implications pour les acteurs de la filière oléagineuse, les changements intervenus depuis avril 2013, et les défis futurs à relever.

  8. Atmospheric radon: origin and transfer

    Energy Technology Data Exchange (ETDEWEB)

    Segovia, N.; Tamez, E.; Pena, P.; Gaso, I. [Instituto Nacional de Investigaciones Nucleares, Mexico City (Mexico); Mireles, F.; Davila, I.; Quirino, L. [Universidad Autonoma de Zacatecas (Mexico). Centro Regional de Estudios Nucleares

    1994-12-31

    Atmospheric indoor and outdoor radon surveys have been performed in several locations of Mexico. In order to estimate the radon transfer from different origins to the atmosphere, soil and ground water, together with the exhalation rate from bare and coated building materials have also been studied. The radon detection was performed with SSNTD, an automatic silicon-based radon monitor and the liquid scintillation technique. The results from several years of monitoring indicate that the atmospheric radon behaviour is different for the countryside as compared with more complex inhabited regions; transfer from soil being inhibited by the specific structures of the cities. The effect of wall coatings reduced from 50% to 90% the radon exhalation from bare building materials. A low radon content was observed in the ground water samples studied. (Author).

  9. Du personnel au politique : construction d’une identité militante dans le journal d’Alice Stone Blackwell (1872-1874

    Directory of Open Access Journals (Sweden)

    Claire Sorin

    2008-09-01

    Full Text Available Le militantisme n’est pas seulement affaire de scène publique ; les coulisses, qui sont en interaction permanente avec cette scène, forment un espace crucial où les enjeux se tissent et les acteurs se fabriquent. Alice Stone Blackwell, la fille de la célèbre féministe américaine Lucy Stone, a laissé un certain nombre de journaux mais c’est dans celui qu’elle écrivit adolescente (1872-1874 que l’on voit clairement s’ébaucher et s’incarner la voix militante de l’auteur. L’étude d’un texte « privé » (dont le statut est en fait beaucoup plus complexe ne présente pas seulement l’intérêt d’un regard intime et particulier sur le mouvement féministe américain de la fin du dix-neuvième siècle. Elle permet aussi de comprendre comment l’écriture autorise le sujet à tester et à s’approprier un ensemble de discours sur la nature féminine qui rompent avec l’idéal de domesticité et le culte de la fragilité. Le journal permet à Alice Blackwell de construire son identité de militante et de l’articuler avec d’autres facettes de son existence. Loin d’être simplement le reflet conventionnel d’une pratique bourgeoise essentiellement réservée au sexe féminin, l’écriture du journal chez Blackwell participe d’un acte militant, dont le trait le plus saillant est sans doute de mettre en scène un corps vigoureux et triomphant, apte à investir la sphère publique.El militantismo no sólo es un asunto de la escena pública ; los arcanos, en continua interacción con esa escena, forman un espacio donde se trama lo que está en juego y donde se fabrican los actores. Alice Stone Blackwell, hija de la famosa feminista americana Lucy Stone, ha dejado varios diarios, pero es en él que escribió de joven (1872-1874 donde claramente se esboza y se encarna la voz militante de la autora. El estudiar un texto « privado » no sólo presenta el interés de una mirada intima sobre el movimiento

  10. Application of radon survey to engineering geology

    International Nuclear Information System (INIS)

    Zhou Xionghua; Wang Xiaoqun; Liu Huajun; Wei Yunjie

    2004-01-01

    Analyzing the principle and theoretical basis of radon survey and relations between radon anomalies and different geologic phenomena, this paper proposes criteria for determining radon anomaly and features of radon emanation anomaly. The important role of radon survey in engineering geology is discussed on specific by engineering examples

  11. Radon assay for SNO+

    Energy Technology Data Exchange (ETDEWEB)

    Rumleskie, Janet [Laurentian University, Greater Sudbury, Ontario (Canada)

    2015-12-31

    The SNO+ experiment will study neutrinos while located 6,800 feet below the surface of the earth at SNOLAB. Though shielded from surface backgrounds, emanation of radon radioisotopes from the surrounding rock leads to back-grounds. The characteristic decay of radon and its daughters allows for an alpha detection technique to count the amount of Rn-222 atoms collected. Traps can collect Rn-222 from various positions and materials, including an assay skid that will collect Rn-222 from the organic liquid scintillator used to detect interactions within SNO+.

  12. Radon thematic days - Conference proceedings

    International Nuclear Information System (INIS)

    2011-03-01

    This document brings together the available presentations given at the Radon thematic days organized by the French society of radiation protection (SFRP). Twenty five presentations (slides) are compiled in the document and deal with: 1 - General introduction about radon (Sebastien Baechler, IRA); 2 - Survey of epidemiological studies (Dominique Laurier, IRSN); 3 - Dosimetric model (Eric Blanchardon, Estelle Davesne, IRSN); 4 - Radon issue in Franche-Comte: measurement of the domestic exposure and evaluation of the associated health impact (Francois Clinard, InVS); 5 - WHO's (World Health Organization) viewpoint in limiting radon exposure in homes (Ferid Shannoun, OMS); 6 - Radon measurement techniques (Roselyne Ameon, IRSN); 7 - Quality of radon measurements (Francois Bochud, IRA); 8 - International recommendations (Jean-Francois Lecomte, IRSN); 9 - Radon management strategy in Switzerland - 1994-2014 (Christophe Murith, OFSP); 10 - 2011-2015 action plan for radon risk management (Jean-Luc Godet, Eric Dechaux, ASN); 11 - Radon at work place in Switzerland (Lisa Pedrazzi, SUVA); 12 - Strategies of radiation protection optimization in radon exposure situations (Cynthia Reaud, CEPN); 13 - Mapping of the radon potential of geologic formations in France (Geraldine Ielsch, IRSN); 14 - Radon database in Switzerland (Martha Gruson, OFSP); 15 - Radon 222 in taps water (Jeanne Loyen, IRSN); 16 - Buildings protection methods (Bernard Collignan, CSTB, Roselyne Ameon, IRSN); 17 - Preventive and sanitation measures in Switzerland (Claudio Valsangiacomo, SUPSI); 18 - Training and support approach for building specialists (Joelle Goyette-Pernot, Fribourg engineers and architects' school); 19 - Status of radon bulk activity measurements performed between 2005-2010 in public areas (Cyril Pineau, ASN); 20 - Neuchatel Canton experiments (Didier Racine, SENE); 21 - Montbeliard region experience in the radon risk management (Isabelle Netillard, Pays de Montbeliard Agglomeration); 22

  13. Réponse équilibrée aux besoins en eau dans le bassin du Saïss au ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    21 avr. 2011 ... Après avoir acquis une formation de chimiste au sein des universités de Rabat, de Toulouse et de Glasgow, Ahmed Legrouri a entrepris, à l'Université de Marrakech, .... Morocco's rural northeast coast is increasingly vulnerable to the effects of climate change – sea level rise, storm surges, and coastal flo.

  14. Radon in the Exhaled Air of Patients in Radon Therapy.

    Science.gov (United States)

    Lettner, Herbert; Hubmer, Alexander; Hofmann, Werner; Landrichinger, Julia; Gaisberger, Martin; Winkler-Heil, Renate

    2017-11-01

    In the Gastein valley, numerous facilities use radon for the treatment of various diseases either by exposure to radon in air or in radon rich thermal water. In this study, six test persons were exposed to radon thermal water in a bathtub and the time-dependent radon activity concentration in the exhaled air was recorded. At temperatures between 38°C and 40°C, the radon activity concentration in the water was about 900 kBq/m3 in a total volume of 600 l, where the patients were exposed for 20 min, while continuously sampling the exhaled air during the bathing and 20 min thereafter. After entering the bath, the exhaled radon activity concentration rapidly increased, reaching some kind of saturation after 20 min exposure. The radon activity concentration in the exhaled air was about 8000 Bq/m3 at the maximum, with higher concentrations for male test persons. The total radon transfer from water to the exhaled air was between 480 and 1000 Bq, which is equivalent to 0.08% and 0.2% of the radon in the water. © The Author 2017. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com.

  15. Radon diagnosis based on investigation of radon sources and radon entry in houses

    International Nuclear Information System (INIS)

    Robe, M.C.; Le Bronec, J.; Rannou, A.; Tymen, G.

    1992-01-01

    The search for practical techniques to reduce radon levels in dwellings led to the development of a method for identifying radon sources and pathways of transfer to upper floors. A pilot study in Britanny was carried out in some houses with relatively high radon levels. This study involved measurements of radon gas concentrations in the air, radon exhalation rates from the soil and walls (indoors and outdoors), the potential alpha energy concentration of radon daughters, and the ventilation rate. The structural characteristics of dwellings and the influence of the lifestyle of the occupants were examined. Analysis of the results shows that a limited number of parameters can be selected for use in rapid radon diagnosis. (author)

  16. Nicole Dufournaud, Rôles et pouvoirs des femmes au XVIe siècle dans la France de l'Ouest

    Directory of Open Access Journals (Sweden)

    Nicole Dufournaud

    2007-11-01

    Full Text Available Dans les années 1970, Joan Kelly posait la question : « Les femmes ont-elles connu une Renaissance ? ». L'historienne américaine y répondait par la négative. Revenir sur cette question, c'est chercher à comprendre l'évolution du statut des femmes. Grâce à une étude localisée sur un espace géographique relativement homogène, nous montrons en quoi les femmes ont compté dans la dynamique sociale et économique de la Renaissance et en quoi elles y ont gagné et perdu.La thèse se découpe en six chap...

  17. Study of point defects in pure iron by means of electrical resistivity; Etude au moyen de la resistivite electrique des defauts ponctuels dans le fer pur

    Energy Technology Data Exchange (ETDEWEB)

    Minier-Cassayre, C. [Commissariat a l' Energie Atomique, Grenoble (France). Centre d' Etudes Nucleaires

    1965-04-01

    In the first part of this work, after having reviewed the production, observation and the annealing of point defects In metals, we resume the present state of research. In the second part, we explain the techniques we have employed to produce point defects at low temperatures: irradiation, quenching and cold-work; and go on to the study of their migration and annealing. The experimental results obtained for pure iron and for iron containing certain impurities are presented in the third part. In the fourth part we suggest a model which explains the different stages of annealing observed, and their properties. We then compare the energies of interaction between point defects with the values deduced from the theory of elasticity. (author) [French] Dans la premiere partie de cette etude, apres avoir passe en revue la production, l'observation et les modes de guerison des defauts ponctuels dans les metaux, nous exposons l'etat actuel des recherches. La seconde partie est consacree aux techniques que nous avons employees pour produire des defauts ponctuels a basse temperature: irradiations, trempe et ecrouissage puis a l'etude de leur migration et de leur guerison. Les resultats experimentaux obtenus dans le fer pur et le fer contenant certaines impuretes sont presentes dans le troisieme chapitre. Nous proposons ensuite un modele qui explique les differents stades de guerison observes et leurs nombreuses proprietes: nous comparons les energies d'interaction entre defauts ponctuels aux valeurs que l'on pourrait deduire d'un modele elastique. (auteur)

  18. Radon campaigns. Status report 2008

    International Nuclear Information System (INIS)

    Arvela, H.; Valmari, T.; Reisbacka, H.; Niemelae, H.; Oinas, T.; Maekelaeinen, I.; Laitinen-Sorvari, R.

    2008-12-01

    Radon campaigns aim at activating citizens to make indoor radon measurements and remediation as well as increasing the common awareness of indoor radon questions. Indoor radon increases the risk of lung cancer. Through radon campaigns Radiation and Nuclear Safety Authority (STUK) also promotes the attainment of those goals that the Ministry of Social Affairs and Health has set for municipal authorities in Finland for prevention of the harmful effects of radon. The Ministry of Social Affairs and Health supports this campaign. Radon campaigns were started in autumn 2003. By autumn 2008 the campaigns have been organised already in 64 regions altogether in 160 municipalities. In some municipalities they have already arranged two campaigns. Altogether 14 100 houses have been measured and in 2 100 of these the action limit of radon remediation 400 Bq / m 3 has been exceeded. When participating in radon campaigns the house owners receive a special offer on radon detectors with a reduced price. In 2008 a new practice was introduced where the campaign advertisements were distributed by mail to low-rise residential houses in a certain region. The advertisement includes an order / deposit slip with postage paid that the house owner can send directly to STUK to easily make an order for radon measurement. In the previous radon campaigns in 2003 - 2007 the municipal authorities collected the orders from house owners and distributed later the radon detectors. The radon concentrations measured in the campaign regions have exceeded the action limit of 400 Bq / m 3 in 0 - 39% of houses, depending on the region. The total of 15% of all measurements made exceeded this limit. The remediation activities have been followed by sending a special questionnaire on remedies performed to the house owners. In 2006 - 2007 a questionnaire was sent to those households where the radon concentration of 400 Bq / m 3 was exceeded during the two first campaign seasons. Among the households that replied

  19. Contribution Economique et Sociale de la pêche artisanale au Sénégal

    OpenAIRE

    Dione, D.; Sy, A.B.; Ndiaye, M.S.

    2005-01-01

    Programme pour des Moyens d'Existence Durables dans la Pêche en Afrique de l'Ouest. Projet Pilote 1 "Moyens d'Existence améliorés dans le secteur post-capture de la pêche artisanale" au Cameroun, en Gambie, au Sénégal et au Tchad.

  20. Radon in dwellings

    International Nuclear Information System (INIS)

    1987-01-01

    This report gives a review of the present situation in Sweden concerning the knowledge and research on radon in dwellings.The responsibilities and need for actions in this field are examined. Costs and possibilities for financial help to install radonreducing equipment are also treated. (L.E.)

  1. Autonomisation des femmes au moyen de lieux de travail humains ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Autonomisation des femmes au moyen de lieux de travail humains : Ateliers de confection en Asie du SudEst. En Asie, les ateliers de confection constituent un secteur d'emplois dominant, néanmoins les conditions dans ces lieux de travail sont parmi les plus rudes dans la région. Dans beaucoup d'ateliers de confection en ...

  2. Construction materials and Radon

    International Nuclear Information System (INIS)

    Paschuk, Sergei A.; Correa, Janine Nicolosi; Loriane, Fior; Schelin, Hugo R.; Pottker, Fabiana; Paula Melo, Vicente de

    2008-01-01

    Full text: Current studies have been performed with the aim to find the correlation of radon concentration in the air and used construction materials. At the first stage of the measurements different samples of materials used in civil construction were studied as a source of radon in the air and at the second step it was studied the radon infiltration insulation using different samples of finishing materials. For 222 Rn concentration measurements related to different construction materials as well as for the studies of radon emanation and its reduction, the sealed cell chambers, of approximately 60 x 60cm 2 , have been built using the ceramic and concrete blocks. This construction has been performed within protected and isolated laboratory environment to maintain the air humidity and temperature stable. These long term measurements have been performed using polycarbonate alpha track passive detectors. The exposure time was set about 15 days considering previous calibration performed at the Institute of Radiation Protection and Dosimetry (IRD/CNEN), where the efficiency of 70% was obtained for the density of alpha particle tracks about 13.8 cm -2 per exposure day and per kBq/m 3 of radon activity concentration. The chemical development of alpha tracks has been achieved by electrochemical etching. The track identification and counting have been done using a code based on the MATLAB Image Processing Toolbox. The cell chambers have been built following four principle steps: 1) Assembling the walls using the blocks and mortar; 2) Plaster installation; 3) Wall surface finishing using the lime; 4) Wall surface insulation by paint. Making the comparison between three layers installed at the masonry walls from concrete and ceramic blocks, it could be concluded that only wall painting with acrylic varnish attended the expectation and reduced the radon emanation flow by the factor of 2.5 approximately. Studied construction materials have been submitted the instant

  3. Les usages du sucre dans le manuel de pharmacie de Cohen al-‘Aṭṭār médecin juif du Caire au XIIIe siècle

    Directory of Open Access Journals (Sweden)

    Ouerfelli, Mohamed

    2013-06-01

    Full Text Available In the absence of a pharmaceutical guide for the usage of apothecaries and merchants of drugs and drinks, which took into account the evolution of pharmacy and the development of pharmaceutical products, Cohen al-‘Aṭṭar wrote a new manual in which he reminded us not only of the writings of his predecessors, but also the point of view of his contemporaries, notably his proper experiences he carried out in his shop in Cairo to make pharmaceutical products and the means to preserve them. This pharmaceutical manual, the richest in medicine formulas, also stands out on account of the extensive use of sugar in the making of recipes. Given the fact that this product was available in large quantities in Egypt and Syria during the second half of the 13th century, it gradually substituted honey to become the principal ingredient in the making of drugs and drinks. Thus, sugar broke through the food world to become the privilege of the royal class, who turned it into one of the essential elements for their festivities.[fr] Face à l’absence d’un guide pharmaceutique à l’usage des apothicaires et des marchands de drogues et de boissons, qui tient compte de l’évolution de la pharmacie et du développement de la matière médicale, Cohen al-‘Aṭṭār propose un nouveau manuel dans lequel il rappelle non seulement les écrits de ses prédécesseurs, mais il livre également les points de vue de ses contemporains, et surtout ses propres expériences, qu’il mène dans sa boutique du Caire, pour la confection des médicaments et les moyens de les conserver. Ce manuel pharmaceutique, le plus riche en formules médicamenteuses, se distingue également par l’usage massif du sucre dans l’élaboration des recettes. Ce produit, disponible en grandes quantités en Égypte et en Syrie pendant la seconde moitié du XIIIe siècle, se substitue progressivement au miel et devient l’ingrédient principal dans l’élaboration des médicaments et des

  4. Témoignages de la génération post-génocide au Rwanda : transmission et quête dans Un papa de sang de Jean Hatzfeld

    Directory of Open Access Journals (Sweden)

    Valérie Dusaillant-Fernandes

    2017-12-01

    Full Text Available Après Dans le nu de la vie (2000, Une saison des machettes (2003, La stratégie des antilopes (2007 et Englebert des collines (2014, Hatzfeld s’efface le temps d’un nouvel ouvrage, Un papa de sang (2015, pour porter son attention sur les enfants de victimes et de bourreaux dépositaires d’une souffrance qui ne leur appartient pas directement. Issus de familles Hutu ou Tutsi, ces jeunes, âgés de 16 à 20 ans, ne peuvent assimiler complètement des événements qu’ils n’ont pas connus et doivent, par la force des choses, s’efforcer de vivre dans le sillage d’un passé qui renvoie à l’horreur. Pour mieux comprendre l’impact inter- et transgénérationnel du génocide de 1994, nous proposons d’examiner la prise de parole d’adolescents et de jeunes adultes à travers les témoignages recueillis par Jean Hatzfeld et retranscrits dans Un papa de sang. Comment ces adolescents et jeunes adultes ont-ils découvert leur l’histoire familiale et de quelle façon évoquent-ils cette percée des secrets et des tabous ? Comment perçoivent-ils leur identité dans un pays où les « directives gouvernementales excluent les mots "hutu" et "tutsi" du langage de la société rwandaise » (155 ? Quelles démarches entreprennent-ils pour découvrir la vérité sur le passé familial ? Comment expriment-ils leurs craintes ? Font-ils part de méthodes particulières pour obtempérer aux exigences du vivre-ensemble ? Quels sont les expressions ou les mots choisis pour décrire les émotions ressenties lors de la semaine de deuil national qui se tient annuellement du 7 au 14 avril ? À quoi aspirent ces jeunes qui fréquentent les cafés Internet et découvrent une vérité parfois cachée par les voisins ou leurs proches ? Autant de questions auxquelles notre article tente de répondre à travers l’analyse de l’ouvrage d’Hatzfeld.

  5. Radon in Norwegian dwellings

    International Nuclear Information System (INIS)

    Strand, T.; Green, B.M.R; Lomas, P.R.; Mangnus, K.; Stranden, E.

    1991-01-01

    Measurements of radon in indoor air have been made in a total of about 7500 randomly selected dwellings in Norway from all parts of the country. The number of selected dwellings in each municipality is about proportional to its population, except for the two largest municipalities, Oslo and Bergen, where somewhat smaller samples were taken due to the higher population density. The measurements were performed by nuclear track detectors from the National Radiological Protection Boards in United Kingdom, and the integration time for the measurements was 6 months. The detectors were spread evenly over all seasons of the year to eliminate influence from seasonal variation in the radon level. One single measurement was performed in each dwelling: in the main bedroom. The results shows that the distribution of radon concentrations in Norwegian bedrooms is log-normal. The aritmetic mean of the measurements, including all categories of dwellings, is calculated to be 51 Bq/m 3 and the corresponding geometric mean to be 26 Bq/m 3 . In a large proportion of single-family houses the living room and the kitchen are located on the ground floor while the bedrooms are located one floor higher. The results of the study shows that the radon level is somewhat higher at the ground floor than on the first floor, and higher in the basement than on the first floor. Taking this into account, and assuming that measurements in bedrooms on the first floor is a representative average for living room and kitchen, the average radon concentration for Norwegian dwellings is estimated to be between 55-65 Bq/m 3 . In this estimate, possible influences of the fact that the winters 87/88 and 88/89 were much warmer than normal and may therefor have lowered the results, has been taken into account. 15 refs., 9 figs., 15 tabs

  6. Indoor radon and earthquake

    International Nuclear Information System (INIS)

    Saghatelyan, E.; Petrosyan, L.; Aghbalyan, Yu.; Baburyan, M.; Araratyan, L.

    2004-01-01

    For the first time on the basis of the Spitak earthquake of December 1988 (Armenia, December 1988) experience it is found out that the earthquake causes intensive and prolonged radon splashes which, rapidly dispersing in the open space of close-to-earth atmosphere, are contrastingly displayed in covered premises (dwellings, schools, kindergartens) even if they are at considerable distance from the earthquake epicenter, and this multiplies the radiation influence on the population. The interval of splashes includes the period from the first fore-shock to the last after-shock, i.e. several months. The area affected by radiation is larger vs. Armenia's territory. The scale of this impact on population is 12 times higher than the number of people injured in Spitak, Leninakan and other settlements (toll of injured - 25 000 people, radiation-induced diseases in people - over 300 000). The influence of radiation directly correlates with the earthquake force. Such a conclusion is underpinned by indoor radon monitoring data for Yerevan since 1987 (120 km from epicenter) 5450 measurements and multivariate analysis with identification of cause-and-effect linkages between geo dynamics of indoor radon under stable and conditions of Earth crust, behavior of radon in different geological mediums during earthquakes, levels of room radon concentrations and effective equivalent dose of radiation impact of radiation dose on health and statistical data on public health provided by the Ministry of Health. The following hitherto unexplained facts can be considered as consequences of prolonged radiation influence on human organism: long-lasting state of apathy and indifference typical of the population of Armenia during the period of more than a year after the earthquake, prevalence of malignant cancer forms in disaster zones, dominating lung cancer and so on. All urban territories of seismically active regions are exposed to the threat of natural earthquake-provoked radiation influence

  7. Assessment of risks associated to ionizing radiations: lung cancers after domestic radon exposure and thyroid cancers after accidental exposure to radioactive iodines; Evaluation des risques associes aux rayonnements ionisants: cancers du poumon apres exposition domestique au radon et cancers de la thyroide apres exposition accidentelle aux iodes radioactifs

    Energy Technology Data Exchange (ETDEWEB)

    Catelinois, O

    2004-09-15

    The aim of this work is to develop a critical analysis of quantitative risk assessment in the field of ionizing radiation and to provide new estimates of attributable risks for particular situations of environmental exposure to ionizing radiation. This work is based on knowledge about dose-response relationships and ionizing radiation exposure of the general population. The work focuses on two different situations that both present an important interest for public health: lung cancer associated with domestic radon exposures (natural situation) and thyroid cancer associated with the Chernobyl accident fallout (accidental situation). The assessment of lung cancer risk associated with domestic radon exposure considers 10 dose-response relationships resulting from miner cohorts and case-control studies in the general population. A critical review of available data on smoking habits has been performed and allowed to consider the interactions between radon and tobacco. The exposure data come from measurements campaigns carried out since the beginning of the 1980 by the Institute for Radiation protection and Nuclear Safety and the Health General Directory in France. The French lung cancer mortality data are provided by the I.N.S.E.R.M.. Estimates of the number of attributable cancers are carried out for the whole country, stratified by 8 large regions (Z.E.A.T.) and by 96 departments for the year 1999 allowing to perform a sensibility analysis according to the geographical level of calculation. Uncertainties associated to risk coefficients and exposures have been quantified and it's impact on risk estimates is calculated. The estimated number of deaths attributable to domestic radon exposure ranges from 543 (90% uncertainty interval (U.I.): 75-1,097) to 3,108 (90% U.I.: 2,996-3,221). The corresponding risk fractions range from 2.2% (90% U.I.: 0.3%-4.4%) to 12.4% (90% U.I.: 11.9%-12.8%). The assessment of thyroid cancer risk in the most exposed area of France due to

  8. Construction of radon/radon daughter calibraton chamber

    International Nuclear Information System (INIS)

    Fry, J.; Gan, T.H.; Leach, V.A.; Saddlier, J.; Solomon, S.B.; Tam, K.K.; Travis, E.; Wykes, P.

    1983-01-01

    The radon/radon daughter test chamber is a copper lined room 1.65x1.75x2.75m with an effective volume of 8000 litres. The air residence time is controlled by circulating the air in the chamber through absolute filters which remove 99.9% of particulates. Radon is drawn into the chamber from a 17 μCi 226 RaCl source using the pressure differential across the blowers (<3 psi)

  9. Preliminary background radon and radon progeny concentrations at North Ranger

    Energy Technology Data Exchange (ETDEWEB)

    Auty, R.; Du Preez, H. [Energy Resources of Australia Ltd., Jabiru, NT (Australia). Safety, Health and Radiation Protection Dept.

    1994-12-31

    The aim of this study was to determine background concentrations due to radon ({sup 222}Rn) and radon progeny at the North Ranger lease and proposed transport corridor. The results of this study would assist in establishing rehabilitation standards. Airborne {sup 222}Rn and short lived products vary significantly over a period of time. These variations are primarily due to changes in meteorological conditions. A program was set up to monitor radon and radon progeny concentrations over an extensive period of time so that diurnal and seasonal variations could be assessed. This paper outlines the methodologies, instrumentation, current results and proposed work. 3 refs., 4 tabs.

  10. Human perception of radon risk and radon mitigation: Some remarks

    International Nuclear Information System (INIS)

    Neznal, M.; Neznal, M.

    2008-01-01

    The Radon program in the Czech Republic has a relatively long and rich history. Procedures, which enable to evaluate the risk of radon penetration from the ground, to protect new buildings, to find existing buildings with elevated indoor radon levels and to realise remedial measures in such buildings, have been developed, published and tested. In some cases, the whole system may fail due to psychological or sociological reasons. Three types of problems (conflicts) will be presented: human behaviour affecting measurement results, conflict between individual and 'all-society' points of view, interpretation of radon risk itself. (authors)

  11. Contribution to the study of low fragments correlations during Au + Au collisions at 150 and 400 A.MeV; Contribution a l`etude des correlations entre fragments legers dans les collisions Au+Au a 150 et 400 A.MeV

    Energy Technology Data Exchange (ETDEWEB)

    Montbel, I.

    1994-06-01

    The study of fragment-fragment correlations at small relative momenta can give informations on the space-time extend of the emitting source, and on the nuclear density, which is one of the variables used in the equation of state. This analysis shows the experimental results obtained with the FOPI detector at GSI-Darmstadt, for Au + Au central collisions at 150 and 400 A.MeV. These results are the first studies at such high energies and for heavy systems. Two fragments correlation functions are compared with theoretical calculations of D.H. Boal, including the size of the source as a parameter. We must take into account effects of experimental biases (namely the relative momentum resolution) on the theoretical correlation function, in order to make a comparison with experimental results. The extracted experimental radii correspond to the final phase of the expansion, and the obtained densities are smaller that normal density of nuclear matter. In the final state of the interaction, intermediate mass fragments and their excited states are observed. We note a shift of these excited states at 400 A.MeV, which can be explained by the detector effects. We observe a weak sensibility of the source size versus the centrality of the collision. That can be explained either by a mixing of sources, or by the observation of a source at the end of expansion whose the radius is quite independent of the initial centrality. Energetic particles correspond to smaller size of the source, which can be explained as a higher compression, or as a different stage of the collision. We give some prospectives for the future experiments at GSI-Darmstadt. (author). 117 refs.

  12. Fiction et réalité dans Pays sans chapeau de Dany Laferrière: Entre autobiographie, autofiction et au-delà

    Directory of Open Access Journals (Sweden)

    Arthur Mukenge

    2016-11-01

    Full Text Available En architecte, le narrateur monte en épingle l’histoire d’ici et d’ailleurs : après vingt années passées à Montréal, il fait un rebond chez lui, à Port-au-Prince (cfr Pays sans chapeau. À première vue, Haïti demeure le même ; c’est le statu quo que le narrateur observe : l’odeur du café est la même, la pauvreté aussi crue que violente affecte la population, les amis du narrateur sont restés fidèles à leur jeunesse. Par la même occasion, le roman relance le débat sur la pertinence de la migration, qui, du coup, semble moins centrée à une ère où l’imaginaire se situe au-delà des pays « réel » et « imaginaire » ; cette dichotomie donne une vraie valeur intrinsèque à Pays sans chapeau et démontre, de ce fait, la belle forme technique et esthétique du roman. Ainsi, nous allons chercher à démontrer comment Pays sans chapeau constitue un corpus stratégique qui se situe entre l’autobiographie, l’autofiction au delà … Fiction and reality in Pays sans chapeau (A country without a hat by Dany Laferrière: Between autobiography autofiction and beyond. Pays sans chapeau (a country without hat is one of the novels written by Dany Laferrière and published in 2007. This book deals with the return of the narrator, Vieux Os, to Port-au-Prince after many decades spent abroad in exile. It is also based on the painting or description of the Haitian society in which the narrator is horrified by the sheer number of the dead people or ghosts walking around together with the living in the streets of the city. He realises that the city of Port-au-Prince is overcrowded, yet he cannot distinguish the living from the dead amongst the bodies. The article aims to research the perpetual problem of the relationship between reality and fiction in autobiographical texts. An attempt will be made to determine to which category the novel Pays sans chapeau belongs. Consequently, it also analyses the dichotomy between the

  13. Radon and the environment - 222Rn

    International Nuclear Information System (INIS)

    2012-06-01

    After having presented some physical and chemical characteristics of radon 222, this report describes the presence of radon in the environment (in the atmosphere and in soft waters), discusses the radio-toxic effect of radon on human health (exposure, epidemiology, dose calculation, share of radon in population exposure to ionizing radiations), comments the presence of radon in buildings, briefly describes actions aimed at reducing radon concentration within buildings, briefly addresses the issue of professional exposure to radon, evokes regulatory aspects (at the international level, in France, in Switzerland), and comments principles and practices of radon measurement in buildings, water, and underground cavities

  14. Radon and radiation biology of the lung

    International Nuclear Information System (INIS)

    Crameri, R.; Burkart, W.

    1989-01-01

    The main papers presented at the meeting dealt with the behaviour of radon and the indoor environment, radiation biology of the lung, lung dosis and the possible cancer risk caused by radon in homes, contamination of the room air. A series of special papers treated the radon problem in detail: sources and transport mechanisms of radon, geological aspects of the radon radiation burden in Switzerland, radon in homes, search for radon sources, and the Swiss radon-programme RAPROS. 67 figs., 13 tabs., 75 refs

  15. Geogenic radon potential in Germany

    International Nuclear Information System (INIS)

    Kemski, J.; Siehl, A.; Valdivia-Manchego, M.

    1998-01-01

    Classification of geogenic radon potential in Germany is based on detailed field studies of radon activity in soil gas and gas permeability of the soil in representative test areas with an expected high geogenic radon potential and further on wider spaced investigations in the main part of Germany. As a result, detailed maps of geogenic radon potential for selected test area as well as a general map for Germany (1:2 000 000) are presented. Radon activity in soil gas shows great regional variability, which can direct optimisation of further measures for radon prevention and mitigation, as well as focus attention to areas where additional smaller scaled investigations could be advisable. (orig.) [de

  16. Legal issues in radon affairs

    International Nuclear Information System (INIS)

    Massuelle, M.H.

    1999-01-01

    In France, it was only recently that cases related to high radon concentrations in dwellings received substantial publicity. This irruption of radon as a public health issue came with the general progress of scientific knowledge and the availability of a research capacity in France able to develop expertise. We are interested here in the legal implications of issues that arise from the lag between the activity of experts and the regulatory activity in the domain of radon. We use the term expertise very broadly, to cover the practical application of research findings, the relation of the researchers with the community, and finally the acts by which experts provide their knowledge to the community. We first examine the course by which science developed the radon issue and the way they organized to move from research to expertise; here we try to characterize the various needs for radon expertise. We then discuss the legal difficulties associated with radon expertise

  17. Radon Infiltration in Rented Accommodation

    DEFF Research Database (Denmark)

    Rasmussen, Torben Valdbjørn

    2017-01-01

    Indoor radon levels were measured in 221 homes located in 53 buildings, including 28 multi-occupant houses and 25 single-family terraced houses. The homes consisted of rented accommodation located in buildings recorded as being constructed before 2010 and after the year 1850. The radon level...... in homes was measured and the Buildings were registered for a series of variables describing upgrades, facilities, building components, Construction characteristics and used materials. In addition, the radon level was measured in the basement in 9 of the buildings. The mean year value of the indoor radon...... level was 30.7 (1–250) Bq/m3. The indoor radon level exceeded 100 Bq/m3 in 5.9% of the homes, all located in single-family terraced houses. The investigated variables explained 5.9% of the variation in indoor radon levels, and although associations were positive, none of these, besides homes in single...

  18. ERRICCA radon model intercomparison exercise

    DEFF Research Database (Denmark)

    Andersen, C.E.; Albarracín, D.; Csige, I.

    1999-01-01

    transport of radon, flux calculations, and partitioning of radon between air and water in soilpores. Seven groups participated in the intercomparison. All groups submitted results without knowing the results of others. For these results, relatively large group-to-group discrepancies were observed. Because......, still remain. All in all, it seems that the exercise has served its purpose and stimulated improvements relating to the quality of numerical modelling of radon transport. To maintain a high quality of modelling, it is recommendedthat additional exercises are carried out.......Numerical models based on finite-difference or finite-element methods are used by various research groups in studies of radon-222 transport through soil and building materials. Applications range from design of radon remediation systems to morefundamental studies of radon transport. To ascertain...

  19. Search for the Higgs Boson and for Anomalous Quartic Gauge Boson Couplings in the WW Channel with Dielectron Events with the D0 Experiment at the Tevatron; Recherche du boson de Higgs et de couplages de jauge quartiques anormaux dans le canal WW en électrons dans l'expérience D0 au Tevatron

    Energy Technology Data Exchange (ETDEWEB)

    Chapon, Emilien [Pierre and Marie Curie Univ., Paris (France)

    2013-01-01

    Le paysage de la physique des particules a subi des changements majeurs entre le début de cette thèse, en septembre 2010, et sa n en juin 2013. On peut notamment qualier l'année 2012 de date-clé dans l'histoire de la physique des particules. En 2012, une nouvelle particule a été découverte au LHC [1, 2], dont la majeure partie de la communauté s'accorde aujourd'hui à dire qu'il s'agit très probablement du boson de Higgs. Cet événement est intervenu peu après une sorte de passage de relais entre le Tevatron, arrêté le 30 septembre 2011, et le LHC, dont les toutes premières collisions sont intervenues le 23 novembre 2009.

  20. Radon Research Program, FY 1992

    International Nuclear Information System (INIS)

    1993-04-01

    The United States Department of Energy, Office of Health and Environmental Research (DOE/OHER) is the principal federal agency conducting basic research related to indoor radon. The scientific information being sought in this program encompasses research designed to determine radon availability and transport outdoors, modeling transport into and within buildings, physics and chemistry of radon and radon progeny, dose response relationships, lung cancer risk, and mechanisms of radon carcinogenesis. There still remains a significant number of uncertainties in the currently available knowledge that is used to estimate lung cancer risk from exposure to environmental levels of radon and its progeny. The main goal of the DOE/OHER Radon Research Program is to develop information to reduce these uncertainties and thereby provide an improved health risk estimate of exposure to radon and its progeny and to identify and understand biological mechanisms of lung cancer development and required copollutants at low levels of exposure. Information useful in radon control strategies is also provided by the basic science undertaken in this program

  1. Radon Research Program, FY-1990

    International Nuclear Information System (INIS)

    1991-03-01

    The Department of Energy (DOE) Office of Health and Environmental Research (OHER) has established a Radon Research Program with the primary objectives of acquiring knowledge necessary to improve estimates of health risks associated with radon exposure and also to improve radon control. Through the Radon Research Program, OHER supports and coordinates the research activities of investigators at facilities all across the nation. From this research, significant advances are being made in our understanding of the health effects of radon. OHER publishes this annual report to provide information to interested researchers and the public about its research activities. This edition of the report summarizes the activities of program researchers during FY90. Chapter 2 of this report describes how risks associated with radon exposure are estimated, what assumptions are made in estimating radon risks for the general public, and how the uncertainties in these assumptions affect the risk estimates. Chapter 3 examines how OHER, through the Radon Research Program, is working to gather information for reducing the uncertainties and improving the risk estimates. Chapter 4 highlights some of the major findings of investigators participating in the Radon Research Program in the past year. And, finally, Chapter 5 discusses the direction in which the program is headed in the future. 20 figs

  2. Radon studies in Indian dwellings

    International Nuclear Information System (INIS)

    Khan, A.J.

    2000-01-01

    The indoor radon ( 222 Rn) concentration has been measured by Solid State Nuclear Track Detectors (SSNTDs) in large number of Indian dwellings. Radon concentrations were measured in different parts of the country. In the first study, radon concentrations were measured in 143 dwellings of Udaipur, Bikaner and Banswara towns of Rajasthan province. The distributions of the time-averaged indoor radon concentration in these three towns of the Rajasthan fit an approximately log normal distribution. The geometric mean (GM) values of radon concentrations in these three places were found to be 74 Bq m -3 , 46 Bq m -3 and 66 Bq m -3 with a geometric standard deviation (GSD) of 2.2, 2.2 and 2.5 respectively. In another study, radon concentrations were measured in about 150 dwellings of hilly regions of the country. The measurements were carried out in Kohima (Nagaland), Baijnath and Palampur (Himachal Pradesh). The distribution of radon concentration in Kohima dwellings was found to be approximately log normal, however, the radon distribution in Baijnath and Palampur dwellings seems to be bimodal. The GM values of the radon concentrations for 65 dwellings in Kohima and 43 dwellings in Baijnath and Palampur were 88 Bq m -3 and 134 Bq m -3 with GSD of 1.7 and 2.5 respectively. The results are discussed in detail. (author)

  3. Du figuré au réel : le corps dans la Xestè 3 de Théra

    Directory of Open Access Journals (Sweden)

    Emmanuelle Fournier

    2016-12-01

    Full Text Available Située sur l’île cycladique de Théra, la Xestè 3 est un bâtiment imposant de deux étages, daté du Bronze Récent, qui se distingue par la présence de très nombreuses peintures murales. Un décor qui, de par son thème iconographique particulier, fait aujourd’hui encore l’objet de discussions bien que les chercheurs s’accordent sur la représentation de rites de passage ou d’initiation. Prépondérante dans le bâtiment de la Xestè 3, ces peintures ont en grande partie participé à déterminer la fonction du bâtiment qui pourrait être dédié à la réalisation de ces rituels. Cette analyse interroge sur la relation entre l’espace figuré et l’espace réel, et notamment sur leur interdépendance qui semble avoir un dénominateur commun : le corps. Il est possible de s’interroger sur la place du corps ainsi exposé et sur sa participation dans la construction de cet espace.

  4. Pratiques et identités professionnelles dans le conseil en management en France : entre ethos du service au client et pression du « up or out »

    Directory of Open Access Journals (Sweden)

    Isabel Boni-Le Goff

    2010-02-01

    Full Text Available Les consultants en management exercent leurs activités dans des conditions marquées par un fort nomadisme et par un système de gestion de carrière de « up or out » omniprésent. Le contenu et les conditions de travail donnent une place particulière au public et partant, produisent des activités de coulisses spécifiques. Ils façonnent la construction d’identités professionnelles marquées par l’individualisme et un investissement intense.Practices and professional identities of management consultants in France: between the customer service ethos and pressure of “up or out”Management consultants exercise their activities under conditions stamped by a prevalent tendency to nomadism and by an omnipresent "up or out" approach to career management. The working contents and conditions set forth a prominent part to the public and consequently generate specific backstage activities. They bring about the construction of professional identities marked by downright individualism and unrestricted professional self-involvement.Maneras de actuar e identidades profesionales de los consejeros en management en Francia. Entre el "ethos" deontológico debido al cliente y la presión del "up or out"Los consejeros en management ejercen sus funciones dentro de un ámbito caracterizado por un fuerte nomadismo y por un sistema omnipresente de gestión de la carrera de tipo "up or out". El contenido y las condiciones de trabajo dan una gran importancia al cliente lo que desemboca indirectamente en "movimientos en los bastidores" específicos que contribuyen a moldear una identidad profesional caracterizada por un individualismo y una implicación intensas.

  5. Réponse équilibrée aux besoins en eau dans le bassin du Saïss au ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    ACCA

    régulièrement, l'ABHS ne disposant que d'un effectif limité pour veiller à leur application. Il arrive même que les systèmes de répartition de l'eau soient sabotés. Le conflit autour de la source. Bitit illustre le problème. Cette source, au débit d'environ 1 300 litres par seconde, dessert deux collectivités tribales. Transitant par.

  6. La filière d’oignon d’été dans le Saïs au Maroc : la place et le rôle des intermédiaires de la commercialisation

    Directory of Open Access Journals (Sweden)

    Caroline Lejars

    2014-11-01

    Full Text Available Les agriculteurs dépendent souvent, pour la commercialisation de leur produit, d'un réseau complexe d'intermédiaires privés. Dans les pays en développement, ces intermédiaires de la vente sont souvent accusés de réaliser des profits excessifs et d’être responsables des énormes écarts entre le prix de vente au champ et le prix payé par le consommateur. En s’appuyant sur l’étude de la filière oignon d’été dans le Saïs au Maroc, cet article analyse le rôle de ces réseaux d'intermédiaires, et la répartition des coûts et de la marge bénéficiaire le long de la chaine de production et de commercialisation. On montre ainsi que cette filière crée un grand nombre d'emplois en aval de la production, que ce soit pour la collecte, le stockage, le transport ou la vente. La part de la marge bénéficiaire revenant à l’ensemble des intermédiaires est supérieure à celle revenant aux producteurs, ce qui entraine effectivement une importante différence de prix entre le prix de vente et le prix du marché. Même si les profits et les rôles des intermédiaires sont très variables, certains des acteurs intermédiaires, notamment les détaillants et les revendeurs en gros, récupèrent des marges bien supérieures à celles des agriculteurs. L’organisation des producteurs autour de zones de stockage et d’activités de commercialisation permettrait de limiter le nombre d’intermédiaires, d’accroitre le profit des agriculteurs et de modifier les rapports de négociations souvent asymétriques entre agriculteurs et commerçants.

  7. Risk assessment of radon gas concentration for some selected offices of KNUST campus, Kumasi

    International Nuclear Information System (INIS)

    Bediako, Yaw Addo

    2013-11-01

    Radon (Rn-222) has been identified as an factor that could result in a health hazard by studies all around the world. The health risks can be minimised by preventing measures where radon is highly concentrated as in some mines or homes or offices. A study in the buildup concentration of the inert gas, will give us a better understanding of its possible pathways through soil into the air surrounding and offices where radon releases can become hazardous. Measuring the radon concentrations on campus, can help to deduce the radon flux to identify the problem areas for rehabilitation. An active method incorporating Trace level radon gas detection and continious monitoring method was used in this study to determine the radon concentration of the selected offices. Concentrations ranging from 0.010 to 0.498 pCi/I were detected, with the head of optometry and Visual Science recording the highest concentration of 0.498 pCi/I, while the head of Agricultural Engineering Department office with the least concentration of 0.010 pCi/I. Although these concentrations are generally low as compared with the EPA guidelines of an action level of 4 pCi/I, but no amount of radiation is said to be safe. (au)

  8. Infinite measure~preserving~transformations with Radon MSJ

    OpenAIRE

    Danilenko, Alexandre I.

    2015-01-01

    We introduce concepts of Radon MSJ and Radon disjointness for infinite Radon measure preserving homeomorphisms of the locally compact Cantor space. We construct an uncountable family of pairwise Radon disjoint infinite Chacon like transformations. Every such transformation is Radon strictly ergodic, totally ergodic, asymmetric (not isomorphic to its inverse), has Radon MSJ and possesses Radon joinings whose ergodic components are not joinings.

  9. Indoor radon II

    International Nuclear Information System (INIS)

    Anon.

    1987-01-01

    Because of the growing interest in and public concern about indoor radon, APCA, in April 1987, sponsored the Second International Specialty Conference on Indoor Radon. This book is the proceedings of this conference and includes discussions on: A current assessment of the nature of the problem; Issues related to health effects and risk assessment; The development of public and private sector initiatives; Research into methods of control and prevention; International perspectives; and Measurement methods and programs. The material is intended for the technically oriented and for those responsible for developing programs and initiatives to address this important public health issue. Contributors include federal, state, and provincial program officials and members of the academic and private sectors

  10. Radon measurements indoors

    International Nuclear Information System (INIS)

    Joensson, G.

    1983-02-01

    Measurements of Radon concentrations have been made using photographic film detectors in the communities of Uppsala, Soedertaelje and Tyresoe. The result from 6700 filmexposures in both one-family and apartment houses are reported. The fraction of dwellings with radon daughter concentrations exceeding 200 Bq/m 3 is between 3 and 14 percent for one-family houses and 0 to 5 percent for apartment buildings. 8 to 68 percent of the one-family houses and 57 to 83 percent of the apartment buildings had concentrations lower than 70 Bq/m 3 . The seasonal variations were recorded in one-family houses in Uppsala. In houses with low concentrations, the winter values were higher than the summer values. For houses with high concentrations the reversed variation was recorded. (Author)

  11. Recherche de production électrofaible supersymétrique dans des cascades de désintégration contenant un boson de Higgs avec le détecteur ATLAS au LHC

    CERN Document Server

    Ughetto, Michael; Muanza, Steve; Moultaka, Gilbert; Kneur, Jean-Loïc

    Ce début de XXIème siècle marque le commencement d’une nouvelle ère pour la physique des particules. Avec le démarrage du LHC en 2009, l’échelle du téra-electronvolt peut être sondée directement. Cette échelle est particulièrement importante pour la physique des particules dont les principales théories attendent de nouveaux phénomènes à cette échelle. Mais avant de découvrir cette nouvelle physique, le LHC a d’ores et déjà permis de découvrir en 2012 le boson de Brout-Englert-Higgs, dernière particule qui restait à observer dans le Modèle Standard. Cette première découverte majeure est à la fois un succès pour le Modèle Standard, mais renforce aussi les principales motivations des théories au delà du Modèle Standard, avec au premier rang les théories supersymétriques. Cette thèse qui s’est déroulée entre 2011 et 2014 couvre à la fois la phénoménologie des théories supersymétriques et la recherche expérimentale des signaux prédits par ces théories, sous la su...

  12. La Collection Fè Mboum du Musée de Ngan-Ha dans L’Adamaoua au Cameroun. Materiau Pour L’histoire des Mboum et Problematique de sa Conservation et Valorisation

    Directory of Open Access Journals (Sweden)

    Denis Bienvenu Nizesete

    2016-06-01

    Full Text Available

    Les Fè Mboum ou « choses des Mboum », sont les objets-signes du pouvoir du Bélàkà, chef traditionnel des Mboum de Ngan-Ha, petite localité, située dans les environs de Ngaoundéré dans la région de l’Adamaoua au Cameroun. La collection est riche de deux cents  œuvres environ de facture hétérogène et à l’état de conservation problématique. Perdus de vue en 1931, ces objets sont remis au jour en 1994. Ils sont au centre des traditions d’origine de peuple mboum qui remontent au moins au Xè siècle de notre ère jusqu’à son islamisation au début du XXè siècle. Ce patrimoine culturel matériel oublié, abandonné ou caché, raconte en filigrane l’histoire d’un peuple décidé à redécouvrir son passé et à l’assumer entièrement, dévoile la volonté des hommes soucieux de protéger et de valoriser leur patrimoine et trace la concrétisation d’un projet scientifique interuniversitaire d’ordre muséographique. Cet article qui résulte des enquêtes de terrain et de l’exploitation de documents de première main, fait le point sur l’origine et la redécouverte des Fè Mboum actuellement conservés au musée local de Ngan-Ha, dégage leurs apports à la connaissance d’un fragment de l’histoire des Mboum, décrypte le symbolisme de quelques pièces de la collection, dresse la liste des menaces qui pèsent sur leur facture matérielle et formule des recommandations pour leur préservation et leur mise en valeur, au regard des intérêts scientifique, économique et culturel qu’ils revêtent.

     

    Abstract: The Fe Mboum or “things of the Mboum” are the material signs-of-power of the Belaka, the traditional chief of the Mboum people of Ngan-Ha, a small locality situated near to Ngaoundéré in the Adamaoua Region of Cameroon. The collection comprises approximately two hundreds of art works, made from heterogeneous materials. All are in a

  13. Indoor air radon

    International Nuclear Information System (INIS)

    Cothern, C.R.

    1990-01-01

    This review concerns primarily the health effects that result from indoor air exposure to radon gas and its progeny. Radon enters homes mainly from the soil through cracks in the foundation and other holes to the geologic deposits beneath these structures. Once inside the home the gas decays (half-life 3.8 d) and the ionized atoms adsorb to dust particles and are inhaled. These particles lodge in the lung and can cause lung cancer. The introduction to this review gives some background properties of radon and its progeny that are important to understanding this public health problem as well as a discussion of the units used to describe its concentrations. The data describing the health effects of inhaled radon and its progeny come both from epidemiological and animal studies. The estimates of risk from these two data bases are consistent within a factor of two. The epidemiological studies are primarily for hard rock miners, although some data exist for environmental exposures. The most complete studies are those of the US, Canadian, and Czechoslovakian uranium miners. Although all studies have some deficiencies, those of major importance include uranium miners in Saskatchewan, Canada, Swedish iron miners, and Newfoundland fluorspar miners. These six studies provide varying degrees of detail in the form of dose-response curves. Other epidemiological studies that do not provide quantitative dose-response information, but are useful in describing the health effects, include coal, iron ore and tin miners in the UK, iron ore miners in the Grangesburg and Kiruna, Sweden, metal miners in the US, Navajo uranium miners in the US, Norwegian niobian and magnitite miners, South African gold and uranium miners, French uranium miners, zinc-lead miners in Sweden and a variety of small studies of environmental exposure. An analysis of the epidemiological studies reveals a variety of interpretation problem areas.172 references

  14. Le dévoiement moral dans la littérature de la Renaissance : Fernando de Rojas au miroir de Ludovic Arioste

    Directory of Open Access Journals (Sweden)

    Alessandro Leiduan

    2010-10-01

    Full Text Available Cet article se propose de relever les points de convergence possibles entre La Celestina de Fernando de Rojas et La Lena de l’Arioste. L’analyse des deux œuvres met en lumière l’affleurement, au sein du théâtre italien et du théâtre espagnol du XVIe siècle, d’une réflexion sur le rapport de l’homme au Mal, sur les causes qui peuvent l’amener à se pervertir, à choisir de se mettre volontairement hors la loi, réflexion qui a conduit à légitimer pleinement le rapprochement, souvent évoqué, mais insuffisamment argumenté, des deux pièces.Questo articolo si propone di mettere in luce i punti di convergenza possibili tra La Celestina di Fernando de Rojas e La Lena dell’Ariosto. L’analisi delle due opere ha messo in evidenza l’emergenza, nel teatro italiano e spagnolo del cinquecento, di una riflessione sul rapporto dell’uomo al Male, sulle cause che possono indurre l’essere umano a corrompersi, a scegliere volontariamente di vivere al di fuori di ogni legge, riflessione che ha permesso di legittimare l’accostamento, spesso proposto, ma mai dimostrato, tra le due opere.

  15. Radon - The management of the risk related to radon

    International Nuclear Information System (INIS)

    2010-01-01

    This leaflet briefly explains what radon is, where it comes from, and what it becomes. It indicates and briefly comments its concentrations in French departments, describes how radon can affect our health (lung cancer), describes how the risk can be reduced in buildings, and indicates the existing regulatory provisions

  16. The significance of radon in radioactive pollution of environment. Pt. 2. Radon effect on living organism

    International Nuclear Information System (INIS)

    Kossakowski, S.; Dziura, A.; Kossakowski, A.

    1998-01-01

    Authors review the history of radon monitoring. Epidemiological studies of lung cancer and its correlation to radon concentration in mines and buildings are described. The influence of radon on animals living in the buildings built from waste materials is described. Authors review plans concerning creation of radon monitoring system in Poland. The necessity of monitoring influence of radon on animals is described

  17. Variabilité des techniques de récolte et traitement des céréales dans l'occident méditerranéen au Néolithique ancien et moyen : facteurs environnementaux, économiques et sociaux

    OpenAIRE

    Gassin, Bernard; Bicho, Nuno Ferreira; Bouby, Laurent; Buxo Capdevila, Ramon; Carvalho, António Faustino; Clemente, Comte Ignaco; Marinval, Philippe; Philibert, Sylvie; Gibaja Bao, Juan Francisco; Gonzalez Urquijo, Jesus Emilio; Ibanez Estévez, Juan José; Linton, Jimmy

    2008-01-01

    La reconstitution des techniques agricoles préhistoriques constitue un élément fondamental pour lacompréhension du processus d'expansion de l'agriculture en Méditerranée occidentale. Dans le cadred'un projet européen rassemblant des tracéologues et des carpologues espagnols et français, nousavons, dans une première phase, étudié les méthodes de récolte des céréales pratiquées durant leNéolithique en Espagne et dans le Sud de la France, du Néolithique ancien au Néolithique moyen.L'étude des ou...

  18. Study of the diffusion of iron, of silver and of carbon in beryllium using radioactive tracers; Etude de la diffusion du fer, de l'argent et du carbone dans le beryllium au moyen des traceurs radioactifs

    Energy Technology Data Exchange (ETDEWEB)

    Naik, M.Ch. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1964-06-01

    {sub perpendiculaire} = 1.98 exp - [45700 / RT]. L'anisotropie diminue lorsque la temperature croit. L'argent diffuse plus vite suivant l'axe C que dans le plan de base. Ce resultat ne peut etre explique par le modele propose pour la diffusion d'atomes etrangers en solution dans le zinc. Un plus grand nombre d'experiences est necessaire pour tenter de construire un modele. On a egalement tente de determiner les coefficients de diffusion du carbone dans le beryllium par traitement dans une atmosphere d'acetylene marque au carbone 14. Des coefficients de diffusion ent ete obtenus mais ceux-ci ne semblent pas devoir etre pris en consideration car une reaction chimique se produit a la surface des echantillons. (auteur)

  19. La sensibilité potentielle du sol à l’érosion hydrique dans l’ouest de la Bekaa au Liban

    Directory of Open Access Journals (Sweden)

    Hussein El Hage Hassan

    2013-06-01

    Full Text Available Cet article étudie la sensibilité potentielle du sol à l'érosion hydrique, dans la Bekaa Ouest, à partir d'une approche qualitative qui permet de croiser, à l'aide d'un SIG, les données telles que: l'érodibilité et la battance du sol, le gradient de la pente et l'influence du couvert du sol à l'érosion. Le résultat de la cartographie identifie les secteurs menacés par l'érosion hydrique afin de les protéger. Les trois quarts du secteur étudié ont une sensibilité forte ou très forte. Il s'agit ici de montrer une méthode qui peut être appliquée à d'autres terrains.

  20. L’apprentissage avec des supports mobiles dans l’enseignement supérieur au Bénin : analyse des usages des apprenantes

    OpenAIRE

    Serge Armel Attenoukon; Thierry Karsenti; Michel Lepage

    2015-01-01

    Avec le développement fulgurant, en qualité et en quantité, des téléphones portables, des tablettes et autres terminaux mobiles, la recherche en sciences de l’éducation s’est vite intéressée à leur potentiel cognitif tant pour l’enseignement que pour l’apprentissage. Si, en Amérique du Nord, en Europe et dans certains pays d’Asie, plusieurs études ont été consacrées à la question, l’Afrique ne l’aborde que très timidement alors que le taux d’abonnement aux téléphones mobiles y est le plus éle...

  1. Avancée dans la prévention des « chutes de plain-pied » au travail

    OpenAIRE

    Leclercq, Sylvie; Monteau, Michel; Cuny, Xavier

    2013-01-01

    La chute de plain-pied reste un accident du travail fréquent et grave. La terminologie qualifiant ces accidents est variée, relativement imprécise et n’intègre pas la diversité des accidents rencontrés sous les différentes appellations. L’intérêt de considérer une catégorie d’accidents du travail avec perturbation du mouvement (APM) est tout d’abord mis en évidence à partir de divers extraits de récits d’accidents. Un modèle est ensuite proposé pour les APM montrant que, dans ces cas particul...

  2. Mise au point

    African Journals Online (AJOL)

    tomie est replacé et fixé par des fils d'acier, krönlein lais- sait ce fragment pédiculé au fascia temporalis afin d'évi- ter la dépression de la fosse temporale due à la désinser- tion du muscle temporal [20] ; dans notre série, après reconstitution du cadre, le muscle temporal est suturé à son point d'insertion. pour les tumeurs ...

  3. Le paludisme au Mexique

    International Development Research Centre (IDRC) Digital Library (Canada)

    Nancy Minogue

    Le paludisme est depuis longtemps un important problème de santé publique au Mexique, où les conditions qui prévalent ... C'est dans les régions côtières que le problème a persisté le plus longtemps, les mesures ... recherche sur l'écologie des moustiques a permis d'en découvrir les raisons. « Les moustiques ne se ...

  4. Tolérer ce que l’on ne peut accepter. Blasphème et athéisme dans la pratique judiciaire de l'Inquisition romaine au xviie siècle

    Directory of Open Access Journals (Sweden)

    Federico Barbierato

    2012-03-01

    Full Text Available L’article s’attache au rôle social et au débat religieux autour du problème du blasphème dans le contexte de la République de Venise au début de l’époque moderne. Il met en lumière quels étaient les présupposés doctrinaux pour sa condamnation de la part des ecclésiastiques, les revendications de juridiction de la part de l’État et surtout il cherche à enquêter sur les liens entre les actes blasphématoires et les positions irréligieuses ou athées à la lumière de la documentation inquisitoriale. Le blasphème apparaît de ce point de vue aussi bien comme une manifestation de rébellion doctrinale que comme un acte social toléré et commun.This contribution deals with the social role of blasphemy and the religious debate on it in the early modern Republic of Venice. It sheds light on what was the theological background for ecclesiastical condemnation and which were the State’s claims for jurisdiction. Above all, on the basis of Inquisition documents, it investigates the connection between acts of blasphemy and irreligious or atheist tenets. From this point of view, blasphemy appears both as a manifestation of doctrinal rebellion and as a common and tolerated social practice.Il paper affronta il ruolo sociale e il dibattito religioso intorno al problema della bestemmia nel contesto della Repubblica di Venezia della prima Età moderna. Mette in luce quali fossero i presupposti dottrinari per la condanna da parte ecclesiastica, le rivendicazioni di giurisdizione da parte dello Stato e soprattutto cerca di indagare i legami fra atti blasfemi e posizioni irreligiose o atee alla luce della documentazione inquisitoriale. La bestemmia appare da questo punto di vista tanto come manifestazione di ribellione dottrinale quanto come atto sociale tollerato e comune.

  5. Indoor radon regulation using tabulated values of temporal radon variation.

    Science.gov (United States)

    Tsapalov, Andrey; Kovler, Konstantin

    2018-03-01

    Mass measurements of indoor radon concentrations have been conducted for about 30 years. In most of the countries, a national reference/action/limit level is adopted, limiting the annual average indoor radon (AAIR) concentration. However, until now, there is no single and generally accepted international protocol for determining the AAIR with a known confidence interval, based on measurements of different durations. Obviously, as the duration of measurements increases, the uncertainty of the AAIR estimation decreases. The lack of the information about the confidence interval of the determined AAIR level does not allow correct comparison with the radon reference level. This greatly complicates development of an effective indoor radon measurement protocol and strategy. The paper proposes a general principle of indoor radon regulation, based on the simple criteria widely used in metrology, and introduces a new parameter - coefficient of temporal radon variation K V (t) that depends on the measurement duration and determines the uncertainty of the AAIR. An algorithm for determining K V (t) based on the results of annual continuous radon monitoring in experimental rooms is proposed. Included are indoor radon activity concentrations and equilibrium equivalent concentration (EEC) of radon progeny. The monitoring was conducted in 10 selected experimental rooms located in 7 buildings, mainly in the Moscow region (Russia), from 2006 to 2013. The experimental and tabulated values of K V (t) and also the values of the coefficient of temporal EEC variation depending on the mode and duration of the measurements were obtained. The recommendations to improve the efficiency and reliability of indoor radon regulation are given. The importance of taking into account the geological factors is discussed. The representativity of the results of the study is estimated and the approach for their verification is proposed. Copyright © 2017 Elsevier Ltd. All rights reserved.

  6. Performance d’Hemocue Hb 201+ dans le diagnostic de l’anémie de l’enfant dans les structures sanitaires du niveau périphérique au Togo

    Directory of Open Access Journals (Sweden)

    Ahoefa Vovor

    2013-12-01

    Full Text Available Contexte: L’anémie est un problème de santé publique dans le monde entier, et notamment dans les pays en développement. Elle a des répercussions majeures sur la santé et sur ledéveloppement économique et social d’un pays. La prise en charge des patients anémiés étant nécessaire, il faut un diagnostic biologique précis, et donc un dosage du taux d’hémoglobine par des méthodes fiables. Objectif: Évaluer les performances diagnostiques du test Hemocue Hb201+®. Méthodes: Étude comparative de la mesure du taux d’hémoglobine à partir du photomètre Hemocue Hb 201+® et d’analyseurs d’hématologie chez 213 enfants de 6 à 59 mois souffrant d’un paludisme simple; la détermination du taux d’hémoglobine par les analyseurs est retenue comme méthode de référence pour évaluer Hemocue Hb201+®. Résultats: 72.8% des valeurs obtenues par Hemocue Hb201+® étaient à ±1 g/dl de celles de la méthode de référence. Le coefficient de corrélation de Pearson était de 0.80. La prévalence de l’anémie était de 79.3% pour la méthode de référence et de 77.9% pour Hemocue Hb201+®. La sensibilité et la spécificité de l’analyseur Hemocue Hb201+® étaient respectivement de 95.1% et de 65.3%. Conclusion: Les résultats de l’étude ont montré que le test Hemocue Hb201+® présentait une bonne sensibilité, une spécificité moyenne et une exactitude moyenne dans le diagnostic del’anémie et dans le dosage de l’hémoglobine. Son utilisation peut être recommandée dans les structures périphériques afin de faciliter le diagnostic biologique de l’anémie et sa prise encharge dans les populations vivant dans les zones difficiles d’accès. Performance of HemoCue Hb201+ in the diagnosis of anaemia in children in health facilitiesat the peripheral level in Togo Background: Anaemia is a global public health problem, especially in developing countries. Anaemia has major repercussions on health status, as well as

  7. Measurement of indoor radon concentration by CR-39 track detector

    International Nuclear Information System (INIS)

    Yamamoto, Masayoshi; Yoneda, Shigeru; Nakanishi, Takashi.

    1990-01-01

    A convenient and cheap method for measuring indoor radon ( 222 Rn) concentration with a CR-39 track detector is described. The detector consisted of two sheets of CR-39 enclosed separately in two plastic pots : one covered by a filter (cup method) and another no covering (bare method). The bare method was used here to supplement the cup method. To compare with the result of the CR-39 detector, alpha-ray spectrometry was carried out with a Si(Au) detector in a controlled radon exposure chamber. Indoor radon concentration measured in 133 houses in several districts of Ishikawa Prefecture have been found to range from 6 Bq/m 3 to as high as 113 Bq/m 3 with a median value of 24 Bq/m 3 . The problems to measure indoor radon concentration using the CR-39 detector are also discussed with emphasis on the position of setting the detector in the room and the possible thoron contribution to the detector. (author)

  8. Radon concentration in The Netherlands

    International Nuclear Information System (INIS)

    Meijer, R.J. de; Put, L.W.; Veldhuizen, A.

    1986-02-01

    In 1000 dwellings, which can be assumed to be an reasonable representation of the average Dutch dwellings, time averaged radon concentrations, radon daughter concentrations and gamma-exposure tempi are determined during a year with passive dosemeters. They are also determined outdoor at circa 200 measure points. (Auth.)

  9. Radon Moscow: internationalisation of experience

    International Nuclear Information System (INIS)

    Nevejkin, P.P.; Grishin, O.E.; Rakov, S.M.

    2011-01-01

    Since the early 1990s, SIA Radon Moscow has been an active participant in the international technical cooperation to resolve the current issues of radiation safety and radwaste management. The article presents the experience of such cooperation. Examples of Radon's participation in the international projects on the assessment of safety, the international education network DISPONET and implementation of TACIS projects are given [ru

  10. Radon and risk of cancer

    International Nuclear Information System (INIS)

    Rootwelt, K.

    1988-01-01

    The article reviews present knowledge on the possible detriment to health of radon in homes. It is concluded that inducement of lung cancer has neither been proved nor disproved. Large-scale epidemiological studies are in progress. Until the results of these studies have been reported, frightening anti-radon propaganda should be discouraged

  11. Radon in ground water supplies

    International Nuclear Information System (INIS)

    Dixon, K.L.; Lee, R.G.

    1989-01-01

    In September 1986, the System Water Quality Department of the American Water Works Service Co. began conducting a radon survey that was designed to determine the levels of radon in American ground water supplies, and to assess the radon removal efficiency of existing treatment processes such as filtration through granular activated carbon (GAC) and various forms of aeration. The survey found that companies in the northeastern part of the country experienced the highest levels of radon in ground water supplies. The highest concentrations were in individual wells in New Hampshire, Maryland, Connecticut, Rhode Island, New Jersey, Pennsylvania and California. The analytical results from the occurrence phase of the survey seemed to correlate well with the known geology of the aquifer materials from which samples of ground water were drawn. The highest levels were associated with formations of uranium-bearing granitic rocks. GAC can effectively reduce radon concentrations in drinking water supplies to very low levels. However, the amount of contact time within the carbon bed required to do so would be prohibitive to many water utilities from an operational and economic standpoint. Further, disposal of the spent GAC as a low-level radioactive waste may be required. Aeration is very effective in the removal of radon from drinking water. Packed tower aerators achieved > 95% reduction in radon concentrations and conventional cascading tray aerators achieved > 75% reduction in radon concentrations. 7 refs., 6 tabs

  12. Radon measurements in indoor workplaces

    International Nuclear Information System (INIS)

    Tokonami, S.; Matsumoto, M.; Furukawa, M.; Fujimoto, K.; Fujitaka, K.; Pan, J.; Kurosawa, R.

    1996-01-01

    Radon measurements in several office buildings located in Tokyo were carried out with two types of device to study the time-dependent radon concentration in indoor workplaces. Both types of device use the electrostatic field for the collection of 218 Po onto the electrode of the detector. One provides an average radon concentration throughout the day. The other, in which a weekly timer is installed in the circuit of the electrode of the device, provides an average radon concentration during working hours (9:00-17:00, Monday-Friday). Although radon concentrations in Japanese dwellings have been found to be generally low, relatively high concentrations were observed in the office buildings. No consistent seasonal variation was recognised in this study. Little difference of average radon concentrations between working hours and the whole day was found throughout the year in two offices. On the other hand, a significant difference was observed in other offices. The operation of an air conditioner might change the radon concentration during working hours. From the results of radon measurements the average effective dose in the workplace was estimated to be 0.23 mSv for 2000 working hours in a year. (Author)

  13. Les publics du livre de poche dans la construction du discours sur la démocratisation culturelle au Brésil

    OpenAIRE

    Righini de Souza, Willian Eduardo

    2015-01-01

    Le succès du livre de poche au XXe siècle, avec des collections atteignant des millions d’exemplaires vendus, a fait s’interroger ses partisans tout autant que ses détracteurs sur la possibilité qu’une politique d’encouragement à la lecture passant par une baisse des prix, l’apparition de nouveaux points de vente destinés à toucher ceux qui n’achètent jamais ou rarement des livres, et ainsi susciter l’émergence de nouveaux lecteurs. L’idéal de démocratisation culturelle, qui touchait égalemen...

  14. L’image du français et le « fait francophone » dans l’enseignement supérieur au Danemark

    DEFF Research Database (Denmark)

    Verstraete Hansen, Lisbeth

    2011-01-01

    s article examines the representation of French as it can be interpreted through the curriculum at the two major Danish universities still offering a full university program (BA-Master-Doctoral degree) in French Studies. The article analyses the presence of the fait francophone in the curriculum...... at the University of Aarhus (AU) and the University of Copenhagen (KU) with a point of departure in the following questions: How is the concept of francophonie defined? How is the fait francophone integrated into the curriculum and according to which tradition(s)? The analysis reveals a fundamental distinction...... between “French” and “francophone” phenomena and a type of course organization largely based on the philological model that divides the subjects into three disciplines – language, literature and culture – focusing on the national reference, France. The article concludes that the fait francophone...

  15. Introduction des progiciels intégrés dans les PME : évaluer les risques et compétences associés au projet

    OpenAIRE

    Mourrain, André; Leconte, Patrick; Deltour, François; Ben Chouikha, Mouna

    2009-01-01

    La communication présente les résultats, non définitifs, du projet PROJSI, financé par M@rsouin, sur l’année 2008. Les ERP (Entreprise Resource Planning) sont des progiciels d’intégration des différentes fonctions de l’organisation. Le choix d’adoption d’un ERP relève de la décision stratégique et sa mise en œuvre constitue un projet technique et organisationnel complexe. Au fil des ans, des méthodologies de gestion de projet ont été mises en place, sur la base des expériences d’implantation ...

  16. La fouille de graphes dans les bases de données réactionnelles au service de la synthèse en chimie organique

    OpenAIRE

    Pennerath , Frédéric; Napoli , Amedeo

    2006-01-01

    National audience; La synthèse en chimie organique consiste à concevoir de nouvelles molécules à partir de réactifs et de réactions. Les experts de la synthèse s'appuient sur de très grandes bases de données de réactions qu'ils consultent à travers des procédures d'interrogation standard. Un processus de découverte de nouvelles réactions leur permettrait de mettre au point de nouveaux procédés de synthèse. Cet article présente une modélisation des réactions par des graphes et introduit une mé...

  17. Dosage des vitamines plasmatiques (Vit. D) par RP-HPLC dans des échantillons du service pédiatrie au CHU de Tlemcen

    OpenAIRE

    KADARI, Mohamed

    2009-01-01

    Le dosage de la vitamine D plasmatique chez les enfants d’âge préscolaire de service pédiatrie au CHU de Tlemcen est réalisé par la méthode chromatographie liquide à haute performance à phase inverse, avec détection UV. Cette méthode est caractérisée par l'injection directe du surnageant obtenu par traitement d'un volume de 100 μL de plasma avec le mélange de solvant C2H5OH/CH3C00C2H5 (1 : 1).La quantification des concentrations est réalisée en utilisant le Cholécalciférol comm...

  18. Intérêt des collectivités pour l'implantation d'arbres nourriciers dans les parcs urbains : le cas de Villa El Salvador, au Pérou

    Directory of Open Access Journals (Sweden)

    Lafontaine, M.

    2017-01-01

    Full Text Available Intérêt des collectivités pour l'implantation d'arbres nourriciers dans les parcs urbains : le cas de Villa El Salvador, au Pérou. A study was conducted in Villa El Salvador, Peru, in order to evaluate the interest of local community members in establishing food trees within neighbourhood public green areas. Focus groups and semi-directed interviews conducted with the community actors allowed to identify their perceptions regarding the role these trees could play, the most appropriate management methods for their establishment and maintenance, as well as the best ways of allocating their products. SWOT ( Strength - Weaknesses – Opportunities- Threats and AHP (Analytical Hierarchisation Process analyses permitted to identify the most important favourable and restrictive factors affecting the long-term success of this production strategy. Results show that the possibility of harvesting edible products for family consumption, neighbourhood food aid programs or sale would motivate the inhabitants to contribute to the activities related to the establishment and maintenance of food trees. However, in order to be successful, the implementation of food trees within public green areas has to be in line with neighbourhood policies developed by the local population and to carefully anticipate possible sources of conflicts.

  19. Radon measurements in hispaniola dwellings

    International Nuclear Information System (INIS)

    Gutierrez, J.; Colgan, P.A.; Cancio, D.

    1996-01-01

    The results of a national radon survey and a number of regional surveys of radon in spanish dwelling are reviewed. The best estimate of the geometric mean of indoor radon concentrations is 41.1. Bq/m -3 and single-family dwellings have been shown to be more at risk than apartments. Results need to be interpreted with some caution due to differences in survey methodologies and measurement procedures. The risks from radon exposure are put in perspective by comparison with other voluntary risks. Finally, although a number of 'high risk' areas have already been identified, it is concluded that implementation of a national programme to reduce radon exposure may await a better definition of the problem extent. (authors). 20 refs., 1 tab

  20. Ion climate and radon concentration

    International Nuclear Information System (INIS)

    Busbarna, L.

    1981-01-01

    Characteristic values of radon concentration in natural ion climate and in open air were compared and the effect of artificially produced negative ion excess on the radon concentration of air was studied. The results show that the radon concentration measurable at the rise of negative ion excess is smaller than that in the case of natural equilibrium. This effect can be utilized lowering the background of the scintillation chambers, thus increasing their sensitivity. The negative ions of the artificial ion climate lower radon concentration in closed space. The question arises whether only the ion climate is responsible for the effects on the organism and on the nervous system or the radon concentration of the air also contributes to them. (author)

  1. Radon availability in New Mexico

    International Nuclear Information System (INIS)

    McLemore, V.T.

    1995-01-01

    The New Mexico Bureau of Mines and Mineral Resources (NMBMMR) in cooperation with the Radiation Licensing and Registration Section of the New Mexico Environment Department (NMED) and the US Environmental Protection Agency (EPA) have been evaluating geologic and soil conditions that may contribute to elevated levels of indoor radon throughout New Mexico. Various data have been integrated and interpreted in order to determine areas of high radon availability. The purpose of this paper is to summarize some of these data for New Mexico and to discuss geologic controls on the distribution of radon. Areas in New Mexico have been identified from these data as having a high radon availability. It is not the intent of this report to alarm the public, but to provide data on the distribution of radon throughout New Mexico

  2. Kyste hydatique du foie rompu dans la paroi abdominale et dans le ...

    African Journals Online (AJOL)

    Le kyste hydatique du foie est une parasitose qui sévit à l´état endémique au maroc. La rupture dans la paroi abdominale et dans le psoas est une complication exceptionnelle. Nous rapportons un cas de kyste hydatique du foie rompu dans la paroi et dans le muscle psoas. Le diagnostic a été établi sur les données de ...

  3. Écarts régionaux dans le fardeau économique attribuable au surplus de poids, à la sédentarité et à l’usage du tabac en Colombie-Britannique

    Directory of Open Access Journals (Sweden)

    H. Krueger

    2016-01-01

    Full Text Available Introduction : Les taux de prévalence du surplus de poids, de l'usage du tabac et de la sédentarité varient sensiblement d'une région à l'autre en Colombie-Britannique (C.-B.. La présente étude vise à déterminer la portée d'une éventuelle réduction du fardeau économique en C.-B. si toutes les régions de la province atteignaient des taux de prévalence équivalents à ceux de la région dont les taux sont les plus bas pour ces trois facteurs de risque. Méthodes : Nous avons utilisé une approche élaborée précédemment fondée sur la fraction étiologique du risque pour estimer le fardeau économique associé aux divers facteurs de risque. Le risque relatif selon le sexe et les données de prévalence selon l'âge et le sexe ont été utilisés dans la modélisation. Résultats : Le fardeau économique annuel attribuable à ces trois facteurs de risque en C.-B. s'élevait à environ 5,6 milliards de dollars en 2013, la proportion la plus élevée de ce total étant attribuable au surplus de poids (2,6 milliards, suivie de celle de l'usage du tabac (2 milliards. Même si la C.-B. possède des taux de prévalence de ces facteurs de risque plus bas que toute autre province canadienne, il existe d'importants écarts en son sein. Si chaque région de la province devait atteindre les taux de prévalence les plus bas pour les trois facteurs de risque, un fardeau économique de 1,4 milliard (24 % du total de 5,6 milliards pourrait être supprimé annuellement. Conclusion : Il existe des disparités notables dans la prévalence de chacun des facteurs de risque au sein des régions sanitaires de la C.-B., qui se reflètent dans le fardeau économique attribuable à chaque région. Un éventail de facteurs sociaux, environnementaux et économiques expliquent probablement une partie de ces écarts géographiques, et ces facteurs sous-jacents devraient être pris en compte lors de la mise en place de programmes de prévention.

  4. Radon-technical design methods based on radon classification of the soil

    International Nuclear Information System (INIS)

    Kettunen, A.V.

    1993-01-01

    Radon-technical classification of the foundation soil divides the foundation soil into four classes: negligible, normal, high and very high. Separate radon-technical designing methods and radon-technical solutions have been developed for each class. On regions of negligible class, no specific radon-technical designing methods are needed. On regions of normal radon class, there is no need for actual radon-technical designing based on calculations, whereas existing radon-technical solutions can be used. On regions of high and very high radon class, a separate radon-technical designing should be performed in each case, where radon-technical solutions are designed so that expected value for indoor radon content is lower than the maximum allowable radon content. (orig.). (3 refs., 2 figs., 2 tabs.)

  5. Caractéristiques biologiques de la truite de mer (Salmo trutta L. au Nord de l'Espagne, dans deux rivières des Asturies

    Directory of Open Access Journals (Sweden)

    TOLEDO Ma Del Mar

    1993-07-01

    Full Text Available Une première caractérisation des truites de mer des rivières du Nord de l'Espagne (Asturies est réalisée à partir de l'analyse de la structure de taille et d'âge, ainsi que celle de l'alimentation et des paramètres reproducteurs des poissons adultes. Les truites proviennent des captures réalisées à la ligne (de juin à août sur les rivières Cares et Narcea et par pêche électrique sur les zones de frayères du Narcea durant la saison de reproduction (novembre à janvier. Les truites de mer échantillonnées durant la saison de pêche ont une structure d'âge semblable sur les deux cours d'eau. Environ 85% des individus sont restés deux ans en eau douce avant de descendre en mer, et plus de 95% d'entre eux appartiennent aux classes d'âge de mer 0 + et 1 + . L'importance relative des poissons de 0 + de mer (finnock est légèrement plus élevée dans le Cares (68% que dans le Narcea (51 %. Le rapport des sexes est en faveur des femelles, quelle que soit la classe d'âge de mer. La structure d'âge marin des truites capturées en période de reproduction ne diffère pas de celle observée durant la saison de pêche, bien que montrant une haute proportion de 0 + de mer (32% de l'ensemble des poissons matures. Le taux de maturation chez les truites de 0 + de mer est particulièrement élevé ( 81% parmi les femelles et 100% chez les mâles et tous les individus des autres classes d'âge de mer sont matures. Le nombre d'oeufs (de 571 à 2086 oeufs par femelle et l'index gonadosomatique sont positivement corrélés à la taille et à l'âge de mer des femelles. La truite de mer se nourrit activement en eau douce durant la remontée estivale, puisque 81 % des estomacs examinés étaient pleins. Elle consomme principalement des Epheméroptères, des Diptères et des Trichoptères, mais son alimentation inclut également des proies d'origine terrestre, essentiellement des Arthropodes.

  6. CONTRIBUTION OF RADON FLOWS AND RADON SOURCES TO THE RADON CONCENTRATION IN A DWELLING

    NARCIS (Netherlands)

    DEMEIJER, RJ; STOOP, P; PUT, LW

    1992-01-01

    In this paper a model is presented for analysis of the radon concentrations in a compartment in terms of contributions from transport by flows of air between compartments and from radon sources in the compartment. Measurements were made to study the effect of increased natural ventilation of the

  7. Contribution to the characterization of 222-radon concentrations variability in water to the understanding of an aquifer behaviour in fractured medium: example of the Ploemeur site, Morbihan; Apport de la caracterisation de la variabilite des concentrations en radon-222 dans l'eau a la comprehension du fonctionnement d'un aquifere en milieu fracture de socle: exemple du site de Ploemeur, Morbihan

    Energy Technology Data Exchange (ETDEWEB)

    Le Druillennec, Th

    2007-06-15

    Heterogeneous fractured aquifers which developed in crystalline rocks, such as schist or granite, supply 20% of tap water production of Brittany. These fractured media present a large range of permeability. In these aquifers, fluid flow and transport of elements dissolved in water are strongly related on the geometry of the fractured network. Increasing the knowledge of the hydrogeological behaviour of the aquifer is fundamental for the management and the protection of the groundwater resources. Radon-222 is a radioactive noble gas produced from radium-226 further to the radioactive decay of uranium-238; it occurs naturally in ground waters and derives primarily from U-rich rocks and minerals that have been in contact with water. Radon-222 concentrations in waters are liable to provide significant and relevant information on both the geometry of a fracture network and the flow distribution. Furthermore, radon may also be used as a tracer in the aquifer of water exchanges between zones of variable permeability. Three main results were obtained in this study: 1. An accurate characterisation of the radon concentrations in water was carried out in the Ploemeur aquifer (Brittany, France). These results highlight the variability in the spatial and vertical distributions of {sup 222}Rn activity in groundwater together with a wide range of concentrations extending from 0 to 1 500 Bq.L{sup -1}. 2. The influence of fracture aperture on radon content in groundwater has been demonstrated with the modelling of radon concentration. Indeed, the satisfactory results obtained with a simple crack model highlight that the geometry of the fracture network controls the radon activity in groundwater. 3. Thus, the results of pumping tests performed in the boreholes improved our understanding of the system. After the pumping test, an increase of the radon content in groundwater occurred and evidenced a contribution of a radon-rich water to supply the flow rate that seems to come from the

  8. Analyse antiraciste du rapport au territoire, à l’autre et à l’écriture dans Aimititau ! Parlons-nous !

    Directory of Open Access Journals (Sweden)

    Elise Couture-Grondin

    2016-12-01

    Full Text Available Aimititau ! Parlons-nous ! (2008 propose un projet de correspondances littéraires entre écrivains/es autochtones et non autochtones créant ainsi « une nouvelle langue appartenant au territoire de l’amitié et de la création ». Cet article considère l’échange épistolaire en lien avec le territoire physique et le contexte social. L’auteure explore certaines des tensions entre les discours qui promeuvent un partage d’humanité, au-delà des différences, et les conditions matérielles des injustices qui se perpétuent. Elle propose l’analyse de deux correspondances, celles entre Denise Brassard et Rita Mestokosho, et entre Nahka Bertrand et Jean Désy, qui mettent de l’avant un lieu commun d’où établir le dialogue, soit le lien avec la nature et le métissage. Couture-Grondin suggère alors que les discours interculturels doivent tenir compte de la matérialité du racisme, qui continue d’affecter nos relations, et de la matérialité de l’écriture, qui permet de reconnaître la positionalité des discours et la particularité des traditions intellectuelles et de création autochtones. Aimititau ! Parlons-nous ! (2008 proposes a project of correspondences between Aboriginal and non-Aboriginal writers from Quebec that creates “a new language which belongs to the territory of friendship and creativity”. This paper considers the relationship between the epistolary genre, the physical territory, and the social context. The author explores some of the tensions between discourses that promote the idea of sharing humanity, beyond differences, and the material conditions of ongoing injustices. She analyzes two correspondences, between Denise Brassard and Rita Mestokosho, and between Nahka Bertrand and Jean Désy, which uses a common ground to establish their dialogue, either the relation to nature or the definition of a common identity. Couture-Grondin argues that intercultural discourses must take into account the

  9. Radon remediation in irish schools

    International Nuclear Information System (INIS)

    Synnott, H.

    2006-01-01

    Full text: Commencing in 1998, the Radiological Protection Institute of Ireland carried out radon measurements in 3826 schools in the Republic of I reland on behalf of the Irish Department of Education and Science (D.E.S.). This represents approximately 97% of all schools in the country. Approximately 25% (984) schools had radon concentrations above the Irish national schools Reference Level for radon of 200 Bq/m 3 and required remedial work. The number of individual rooms with radon concentrations above 200 Bq/m 3 was 3020. Remedial work in schools commenced in early 2000. In general schools with maximum radon concentrations in the range 200 -400 Bq/m 3 in one or more rooms were remediated through the installation of passive systems such as an increase in permanent background ventilation mainly wall vents and trickle vents in windows. Schools with maximum radon concentrations greater than 400 Bq/m 3 were usually remediated through the provision of active systems mainly fan assisted sub -slab de pressurization or where this was not possible fan assisted under floor ventilation. The cost of the remedial programme was funded by central Government. Active systems were installed by specialized remedial contractors working to the specifications of a radon remedial expert appointed by the D.E.S. to design remedial systems for affected schools. Schools requiring increased ventilation were granted aided 190 pounds per affected room and had to organize the work themselves. In most schools radon remediation was successful in reducing existing radon concentrations to below the Reference Level. Average radon concentration reduction factors for sub-slab de pressurization systems and fan assisted fan assisted under floor ventilation ranged from 5 to 40 with greater reduction rates found at higher original radon concentrations. Increasing ventilation in locations with moderately elevated radon concentrations (200 - 400 Bq/m 3 ) while not as effective as active systems produced on

  10. Domestic radon in Tunisia

    International Nuclear Information System (INIS)

    El May, Michele V.; Omrane, Latifa; Mtimet, Sadok; Hammou, Azza

    2008-01-01

    In order to determine level of natural radioactivity and to eventually identify areas where radon concentrations are elevated, measurements of indoor air radon concentrations were carried out in Tunisian houses since 1999. Passive alpha-track open Kodalpha dosimeters have been placed in one or two rooms by dwellings at 1 m to 1.50 m from soil. The first campaign controlled the capital, Tunis, and lasted 14 months by two months periods. The annual median was 30 Bq m -3 . In the 120 surveyed houses, a seasonal variation has been found with the highest concentrations unregistered in winter. The second campaign was conducted in 1,151 houses situated in all the inhabited areas of Tunisia during two winter months. The median was 36 Bq m -3 with a maximum of 512 Bq m -3 . The majority of results were lower than 100 Bq m -3 . Only 5.5% of results were comprised between 100 and 200 Bq m -3 and 0.7% between 200 and 400 Bq m -3 . The third campaign was performed in an area where inhabitants used to live in underground homes. Sixty modern and sixty underground houses were controlled during one year by three months periods. The results were significantly different with a median at 46.5 Bq m -3 in the modern houses and 305 Bq m -3 in the underground caves with a maximum at 1,563 Bq m -3 . 54% of results were under 100 Bq m -3 , 32% between 100 and 400, 13% between 400 and 1,000 Bq m -3 . Only 1% (two underground houses) were higher than 1,000 Bq m -3 . A careful enquiry showed that most of these underground houses are no more inhabited and are rarely opened. In these dwellings, the highest concentrations were found during summer. Most of the indoor radon concentration levels found in Tunisia were under international recommended levels. (author)

  11. Les emprises militaires dans l’urbanisme grenoblois du XXe siècle : des opportunités foncières au patrimoine paysager

    Directory of Open Access Journals (Sweden)

    Philippe Grandvoinnet

    2011-06-01

    Full Text Available Déclassée en tant que « place forte » en 1925, Grenoble voit son développement urbain conditionné en grande partie par la libération des emprises militaires. Considérées initialement comme de simples réserves foncières, ces structures militaires ont été progressivement investies d’une valeur patrimoniale qui marque fortement certaines opérations d’aménagement urbain et paysager. À travers l’exemple grenoblois, nous évaluerons l’impact des aménagements militaires du XVIIe au XIXe siècle sur l’urbanisme du XXe siècle et dresserons une cartographie urbaine de ce patrimoine militaire en constitution.Grenoble ceased to be qualified as 'place forte' [fortified town] in 1925, and the town's subsequent urban development was largely conditioned by the availability of former military properties. Considered at first as simple real estate opportunities, these military structures were gradually invested with historical and cultural values which feature strongly in certain operations of urban development and landscaping. Starting out from this example at Grenoble, we will try to assess the impact of military installations of the seventeenth to nineteenth centuries on the town-planning of the twentieth century and will map this now recognised heritage in its urban context.

  12. The effect and the amendment of thermoregulation to the stability of radon concentration in radon chamber

    International Nuclear Information System (INIS)

    Zhang Xiongjie; Wang Renbo; Qu Jinhui; Tang Bin; Zhu Zhifu; Man Zaigang

    2010-01-01

    When the temperature in the airtight radon chamber was adjusted, it would induce the frequent changes of the air pressure in chamber, then the radon concentration in the radon chamber would continuously reduce, which could seriously destroy the stability of the radon concentration in radon chamber. In this paper, on the study of the effect reasons to the stability of radon concentration in airtight radon chamber due to the thermoregulation, a new amendment scheme was put forward, and the solutions of the relevant parameters were discussed. The amendment scheme had been successfully applied to HD-6 radon chamber, and achieved good results. (authors)

  13. Envenimation scorpionique chez l'enfant au centre hospitalier ...

    African Journals Online (AJOL)

    Le scorpion jaune était plus incriminé dans 56,8% des cas, contre 13,6% pour le scorpion noir. A l'admission 0,5% des malades ont été classé au grade I ; 8,6% au grade II et 30,9% au grade III. On a observé 9,9% de décès. Au total, les envenimations scorpioniques sont très fréquentes dans la région d'Agadez, et sont ...

  14. Radon and energy efficient homes

    International Nuclear Information System (INIS)

    Burkart, W.

    1981-09-01

    Radon and its daughters in indoor air are presently responsible for dose equivalents of about 31 mSv/year (3 rem/year) to parts of the respiratory tract. Linear extrapolation from the dose response values of uranium miners heavily exposed to radon and its decay products would suggest that almost all lung cancers in the non-smoking population are caused by environmental 222 Rn. Using epidemiological data on the types of lung cancer found in non-smokers of the general public as compared to the miners, a smaller effect of low level radon exposure is assumed, which would result in a lung cancer mortality rate due to radon of about 10 deaths per year and million or 25% of the non-smoker rate. Higher indoor radon concentrations in energy efficient homes mostly caused by reduced air exchange rates will lead to a several fold increase of the lung cancer incidence from radon. Based on the above assumption, about 100 additional lung cancer deaths/year-million will result both from an increase in radionuclide concentrations in indoor air and a concomitant rise in effectiveness of radiation to cause cancer with higher exposure levels. Possibilities to reduce indoor radon levels in existing buildings and costs involved are discussed. (Auth.)

  15. Radon problem in uranium industry

    International Nuclear Information System (INIS)

    Khan, A.H.; Raghavayya, M.

    1991-01-01

    Radon emission is invariably associated with the mining and processing of uranium ores. Radon (sup(222)Rn) enters mine atmosphere through diffusion from exposed ore body, fractures and fissures in the rocks and is also brought in by ground water. Being the progenitor of a series of short lived radioisotopes it contributes over 70% of the radiation dose to mine workers and thus accounts for nearly 30% of the total radiation doses received by workers in the whole nuclear industry. This paper summarises the data on radon emanation from the ore body, backfilled sands and mine water. Radon and its progeny concentrations in different haulage levels and stopes of the Jaduguda uranium mine are presented to emphasise the need for a well planned ventilation system to control radiation exposure of miners. Results of radon monitoring from a few exploratory uranium mines are included to indicate the need for a good ventilation system from inception of the mining operations. Relative contribution of mine exhaust and tailings surfaces to the environmental radon are also given. Some instruments developed locally for monitoring of radon and its progeny in mines and in the environment are briefly described to indicate the progress made in this field. (author). 17 refs., 2 figs., 6 tabs

  16. Commerce et navigation dans l'Amérique Espagnole Coloniale: le port de Paita et le Pacifique au XVIIIème siècle

    Directory of Open Access Journals (Sweden)

    1993-01-01

    Full Text Available À partir de sources fiscales - les registres de l’Almojarifazgo - cet article tente de retracer l’évolution du commerce maritime du port de Paita sur la côte nord du Pérou au 18ème siècle. Si les navires qui relâchent à Paita étaient en provenance ou à destination de la plupart des ports du Pacifique Sud, d’Acapulco à Pisco, la quasi totalité du trafic exprimé en valeur s’effectuait avec les trois ports du Panamá, de Guayaquil et du Callao. L’importation d’esclaves et l’exportation de l’écorce de quinine sont au cours de cette période les poids lourds du commerce par voie de mer. En appréciant la diversité et les quantités de marchandises exportées par Paita, cette étude essaye aussi d’évaluer la production d’un espace régional - le Corregimiento de Piura - pour lequel il n’existe à cette époque aucune autre source quantitative. COMERCIO Y NAVEGACIÓN EN LA AMÉRICA LATINA COLONIAL: EL PUERTO DE PAITA, PIURA Y EL PACÍFICO EN EL SIGLO 18. Basándose en los manuales de Almojarifazgos, este trabajo intenta seguir la evolución del tráfico marítimo a partir del puerto de Paita (norte del Perú en el siglo 18. Aunque los navíos que hacían escala en Paita tenían como origen y destino muchos puertos del Pacífico español, desde Acapulco hasta Pisco, la casi totalidad de los movimientos en valor se realizaba en los puertos de Panamá, Guayaquil y Callao. Durante este período, el movimiento comercial consistirá principalmente en la importación de esclavos y la exportación de quinina (cascarilla. A través del examen de las listas de embarque y de un intento de medir el volumen de las mercancías exportadas por Paita, el artículo se propone además evaluar la producción de una región del Perú colonial, el corregimiento de Piura, en una época para la cual no se encontraron otras fuentes cuantitativas. TRADE AND SHIPPING IN SPANISH COLONIAL AMERICA: THE PORT OF PAITA AND THE PACIFIC IN THE EIGHTEENTH

  17. A study by internal friction of defects produced in iron and nickel irradiated at very low temperatures; Etude au moyen du frottement interne des defauts crees par irradiation a tres basse temperature dans le fer et le nickel

    Energy Technology Data Exchange (ETDEWEB)

    Keating-Hart, G. de [Commissariat a l' Energie Atomique, Grenoble (France). Centre d' Etudes Nucleaires

    1969-07-01

    This work represents a contribution to the study of point defects in metals. After a brief review of the theory of internal friction we will discuss some technical innovations aimed at increasing the flexibility of the apparatus at our disposal. These innovations have allowed us to extend our range of measurements down to 20 deg. K. We will then discuss our experimental results. Firstly, we describe preliminary experiments on electron irradiated iron and the evidence for a laminar structure. Secondly, we present and account of the first measurements on nickel after neutron irradiation at 27 deg. K. We will compare the results with those obtained by other methods in this laboratory. Essentially we have observed transitory peaks at low temperature due to close Frenkel pairs and we have noticed the absence of a peak which would correspond to the magnetic after effect band of stage I{sub E}. An attempt is made to explain the disappearance of the observed peaks upon the application of an internal saturating magnetic field. (author) [French] Ce memoire constitue une contribution a l'etude des defauts ponctuels dans les metaux. Apres un bref apercu theorique sur le frottement interne, nous presenterons quelques realisations techniques destinees a accroitre les possibilites des instruments qui nous ont ete confies. Ces dernieres nous ont permis d'etendre la gamme des mesures jusqu'a 20 deg. K. Nous parlerons ensuite de nos resultats experimentaux. En premier lieu, ceux obtenus au cours de premieres experiences, sur le fer irradie aux electrons mettent en evidence des structures de laminage. En second lieu, nous exposerons les premieres mesures realisees sur du nickel irradie aux neutrons; nous comparerons ces resultats avec ceux obtenus par d'autres moyens experimentaux dans le laboratoire. Nous avons observe essentiellement des pics fugitifs a basse temperature dus aux paires proches de Frenckel et nous avons constate l'absence d'un pic

  18. Le procédé de blanchiment dans les ateliers monétaires français au XV-XVIème siècle: approche archéométrique et expérimentale

    Directory of Open Access Journals (Sweden)

    Téreygeol, Florian

    2011-12-01

    Full Text Available In the late nineties, excavations in La Rochelle (France have discovered the remains of a royal mint of the sixteenth century. This discovery enabled the collection of artefacts directly related to the manufacture of coins. The exceptional corpus gathered is the subject of a study of the chaîne opératoire of coining in the medieval time. Special attention is paid to an operation which takes place before the strike: the blanching of blanks. Well documented in ancient times, the samples from La Rochelle offer the opportunity to study this process during the medieval period and in a royal mint. In addition, thanks to reconstitution experiments, it is possible to define a reaction mechanism that helps to understand our historical observations.[fr] À la fin des années quatre-vingtdix, des fouilles menées à La Rochelle (France ont permis de mettre au jour les vestiges d’un atelier monétaire royal du XVIe siècle. Cette découverte a permis la collecte de matériel directement liée à la fabrication monétaire. Le corpus exceptionnel rassemblé est l’objet d’une étude qui vise à mettre en évidence la chaîne opératoire de fabrication de monnaie à l’époque considérée. Un intérêt particulier est porté à une technique d’argenture qui intervient avant la frappe des monnaies, le blanchiment des flans. Bien documenté pour les périodes antiques, le matériel de La Rochelle offre la possibilité de mettre en évidence ce procédé pour une période plus récente et dans un cadre officiel. De plus, à partir d’expériences de reconstitution, il a été possible de proposer un mécanisme réactionnel. Les hypothèses proposées permettent alors de dégager des implications historiques dans le procédé de fabrication.

  19. Protection of workers from radon

    International Nuclear Information System (INIS)

    Jacques, P.

    1992-01-01

    The TUC regards exposure to radon as one of a range of health hazards in industry which need to be controlled. In the case of radon the costs of control measures are very much lower than the costs of averting similar doses in the nuclear industry. All employers in the areas affected should be able to demonstrate that they have taken appropriate steps to determine the risks from radon and have introduced remedial measures where appropriate. The TUC considers it essential that trade union safety representatives should be fully involved and consulted about the problem. (Author)

  20. Radon in dwellings the national radon survey Galway and Mayo

    International Nuclear Information System (INIS)

    McGarry, A.T.; Fennell, S.G.; Mackin, G.M.; Madden, J.S.; O'Colmain, M.

    1999-07-01

    This report presents the results of the final phase of the National Radon Survey carried out by the Radiological Protection Institute of Ireland. The counties included in this phase are Galway and Mayo. The average radon concentrations for the houses measured in these counties were 112 Bq/m 3 and 100 Bq/m 3 , respectively. The measurement data were grouped on the basis of the 10 km grid squares of the Irish National Grid System and used to predict the percentage of dwellings in each grid square which exceeds the Reference Level of 200 Bq/m 3 . Grid squares where this percentage is predicted to be 10% or higher are designated High Radon Areas. The health effects of exposure to high radon levels are discussed and recommendations are made regarding both new and existing dwellings. (author)

  1. Radon in dwellings the national radon survey Cork and Kerry

    International Nuclear Information System (INIS)

    McGarry, A.T.; Fennell, S.G.; Mackin, G.M.; Madden, J.S.

    1998-07-01

    This report presents the results of the third phase of the National Radon Survey carried out by the Radiological Protection Institute of Ireland. The counties included in this phase are Cork and Kerry. The average radon concentrations for the houses measured in these counties were 76 Bq/m 3 and 70 Bq/m 3 . The measurement data were grouped on the basis of the 10 km grid squares of the Irish National Grid System and used to predict the percentage of dwellings in each grid square which exceeds the Reference Level of 200 Bq/m 3 . Grid squares where this percentage is predicted to be 10% or higher are designated High Radon Areas. The health effects of exposure to high radon levels are discussed and recommendations are made regarding both new and existing dwellings. (author)

  2. Monitoring of radon concentration in dwellings

    International Nuclear Information System (INIS)

    Kurosawa, Ryuhei

    1991-01-01

    Radon problems in dwellings have recently received much attention. Radon concentration in dwellings, as well as in the general environment, varies with various factors such as meteorological conditions and soil components. Therefore, a long term monitoring of radon concentration is required to obtain an average concentration. This paper reviews a passive type radon monitor that is handy and allows a long term radon monitoring. It provides the structure and principle of the radon monitor, covering the type, filter function, sensitivity of diffusion collecting type (cup type), electrostatic collecting type, adsorption collecting type, and detector of radon monitor. Actual examples of the radon monitor are also given. Radon daughter nuclides will have become major foci of exposure countermeasures. In the future, the development of a passive type monitor for determining potential alpha energy concentration is required. (N.K.)

  3. Radon levels inside residences in Mexico City

    International Nuclear Information System (INIS)

    Espinosa, G.

    1990-01-01

    Levels of radon were measured during winter and spring seasons inside 55 colonial and modern houses and 30 multi-family apartment buildings representative of middle and upper income families. The modern houses and apartment buildings in the southern section of the city had average radon levels exceeding 150 Bq.m -3 with a maximum single measurement of 458 Bq.m -3 . The colonial houses in the central downtown section had radon levels nearly all averaging below 100 Bq.m -3 . Between the ground and third floor of the apartment buildings, radon levels diminished tenfold, indicating that entry of radon-bearing soil gas was largely responsible for the elevated concentrations of radon. The radon levels in winter exceeded by about 30% the radon levels during spring. The potentially adverse health effects of these radon levels may be exacerbated by the quality of air in Mexico City which is often highly polluted during winter. (author)

  4. Radon levels inside residences in Mexico City

    International Nuclear Information System (INIS)

    Espinoza, G.

    1989-01-01

    Levels of radon were measured during winter and spring seasons inside 55 colonial and modern houses and 30 multifamily apartment buildings representative of middle and upper income families. The modern houses and apartment buildings in the southern section of the city had average radon levels exceeding 150 Bq m -3 with a maximum single measurement of 458 Bq m -3 . The colonial houses in the central downtown section had radon levels nearly all averaging below 100 Bq m -3 . Between the ground and third floor of the apartment buildings, radon levels diminished by tenfold indicating that entry of radon-bearing soil gas was largely responsible for the elevated concentrations of radon. The radon levels in winter exceeded by about 30% the radon levels during spring. The potentially adverse health effects of these radon levels may be exacerbated by the quality of air in Mexico City which during winter is often highly polluted. 7 refs., 2 figs

  5. Indoor radon levels in Greek schools

    International Nuclear Information System (INIS)

    Clouvas, A.; Xanthos, S.; Takoudis, G.

    2011-01-01

    Radon and gamma dose rate measurements were performed in 512 schools in 8 of the 13 regions of Greece. The distribution of radon concentration was well described by a lognormal distribution. Most (86%) of the radon concentrations were between 60 and 250 Bq m -3 with a most probable value of 135 Bq m -3 . The arithmetic and geometric means of the radon concentration are 149 Bq m -3 and 126 Bq m -3 respectively. The maximum measured radon gas concentration was 958 Bq m -3 . As expected, no correlation between radon gas concentration and indoor gamma dose rate was observed. However, if only mean values for each region are considered, a linear correlation between radon gas concentration and gamma dose rate is apparent. Despite the fact that the results of radon concentration in schools cannot be applied directly for the estimation of radon concentration in homes, the results of the present survey indicate that it is desirable to perform an extended survey of indoor radon in homes for at least one region in Northern Greece. - Highlights: → Radon detectors installed in 512 schools in 8 of 13 regions of Greece. → Most (86%) of the radon concentrations are between 60 and 250 Bq m -3 . → The arithmetic and geometric mean radon concentration is 149 Bq m -3 and 126 Bq m -3 . → Linear correlation between mean radon gas concentration and mean gamma dose rate.

  6. Radon transport modelling: User's guide to RnMod3d

    Energy Technology Data Exchange (ETDEWEB)

    Andersen, C.E

    2000-08-01

    RnMod3d is a numerical computer model of soil-gas and radon transport in porous media. It can be used, for example, to study radon entry from soil into houses in response to indoor-outdoor pressure differences or changes in atmospheric pressure. It can also be used for flux calculations of radon from the soil surface or to model radon exhalation from building materials such as concrete. The finite-volume model is a technical research tool, and it cannot be used meaningfully without good understanding of the involved physical equations. Some understanding of numerical mathematics and the programming language Pascal is also required. Originally, the code was developed for internal use at Risoe only. With this guide, however, it should be possible for others to use the model. Three-dimensional steady-state or transient problems with Darcy flow of soil gas and combined generation, radioactive decay, diffusion and advection of radon can be solved. Moisture is included in the model, and partitioning of radon between air, water and soil grains (adsorption) is taken into account. Most parameters can change in time and space, and transport parameters (diffusivity and permeability) may be anisotropic. This guide includes benchmark tests based on simple problems with known solutions. RnMod3d has also been part of an international model intercomparison exercise based on more complicated problems without known solutions. All tests show that RnMod3d gives results of good quality. (au)

  7. Radon transport modelling: User's guide to RnMod3d

    International Nuclear Information System (INIS)

    Andersen, C.E.

    2000-08-01

    RnMod3d is a numerical computer model of soil-gas and radon transport in porous media. It can be used, for example, to study radon entry from soil into houses in response to indoor-outdoor pressure differences or changes in atmospheric pressure. It can also be used for flux calculations of radon from the soil surface or to model radon exhalation from building materials such as concrete. The finite-volume model is a technical research tool, and it cannot be used meaningfully without good understanding of the involved physical equations. Some understanding of numerical mathematics and the programming language Pascal is also required. Originally, the code was developed for internal use at Risoe only. With this guide, however, it should be possible for others to use the model. Three-dimensional steady-state or transient problems with Darcy flow of soil gas and combined generation, radioactive decay, diffusion and advection of radon can be solved. Moisture is included in the model, and partitioning of radon between air, water and soil grains (adsorption) is taken into account. Most parameters can change in time and space, and transport parameters (diffusivity and permeability) may be anisotropic. This guide includes benchmark tests based on simple problems with known solutions. RnMod3d has also been part of an international model intercomparison exercise based on more complicated problems without known solutions. All tests show that RnMod3d gives results of good quality. (au)

  8. Proceedings of radon and radon progeny measurements in Australia symposium

    Energy Technology Data Exchange (ETDEWEB)

    Akber, R.A. [Environmental Research Inst. of the Supervising Scientist, Jabiru, NT (Australia); Harris, F. [eds.] [Office of the Supervising Scientist for the Alligator Rivers Region, Canberra, ACT (Australia)

    1994-12-31

    This publication contain papers presented at a symposium on radon and radon progeny measurements in Australia, held in Canberra on 18 February 1994. The emphasis was on results of measurements in different exposure situations, however information on methodology and techniques was also included. The scope of the symposium expanded through participation by scientists from China, French Polynesia and New Zealand. A list of participants and their organizations is included at the end of the proceedings. refs., tabs., figs.

  9. Proceedings of radon and radon progeny measurements in Australia symposium

    International Nuclear Information System (INIS)

    Akber, R.A.; Harris, F.

    1994-01-01

    This publication contain papers presented at a symposium on radon and radon progeny measurements in Australia, held in Canberra on 18 February 1994. The emphasis was on results of measurements in different exposure situations, however information on methodology and techniques was also included. The scope of the symposium expanded through participation by scientists from China, French Polynesia and New Zealand. A list of participants and their organizations is included at the end of the proceedings. refs., tabs., figs

  10. Rôle de l’IRM prostatique dans le cancer de la prostate en 2016: mise au point et perspectives d’avenir

    Directory of Open Access Journals (Sweden)

    A. Barrier

    2017-12-01

    Full Text Available Le diagnostic du cancer de la prostate est le plus souvent porté à l’occasion d’un dosage élevé de PSA, fait dans le cadre du dépistage individuel, et repose sur la réalisation de «biopsies systématisées» par voie transrectale avec guidage échographique. Cette stratégie classique entraîne un risque de sur-diagnostic de cancers cliniquement non significatifs [microfoyers], ainsi qu’une non-détection de certains cancers cliniquement significatifs situés en dehors des zones prélevées. La réalisation d’une IRM prostatique avant les biopsies a tout changé. Elle augmente la détection des cancers de volume significatif grâce aux «biopsies ciblées» sur les anomalies vues à l’IRM. Elle améliore l’estimation de leur grade, de leur taille et permet de préciser leur localisation et contour. Elle permettrait aussi de diminuer la détection des cancers non significatifs, si les biopsies systématisées n’étaient plus faites en cas d’IRM sans cible suspecte. Les applications thérapeutiques de l’IRM sont déterminantes pour l’essor des options récentes de prise en charge comme la sélection des patients pour la surveillance active ainsi que pour l’indication de traitement focal. Les modalités de réalisation et d’interprétation de l’IRM ont été publiées en 2016 sous forme d’une mise à jour du score PI-RADS [Prostate Imaging Reporting and Data System version 2]. Cette standardisation aide les radiologues à proposer aux cliniciens urologues et radiothérapeutes les éléments nécessaires pour le diagnostic et le traitement des cancers de la prostate.

  11. 30 CFR 57.5046 - Protection against radon gas.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Protection against radon gas. 57.5046 Section... Protection against radon gas. Where radon daughter concentrations exceed 10 WL, respirator protection against radon gas shall be provided in addition to protection against radon daughters. Protection against radon...

  12. Radon risk in the house; Il rischio radon nelle abitazioni

    Energy Technology Data Exchange (ETDEWEB)

    Bressa, G. [Padua Univ., Padua (Italy). Dipt. di Farmacologia e Anestesiologia, Lab. di Tossicologia

    2001-04-01

    Radon was discovered in 1900, but its potential dangerousness for man was fully understood only in 1950. Being a radioactive natural gas - and therefore particularly dangerous - radon results from the long decay chain of radionuclides, such as thorium and radium. Some igneous rocks (granite, tufa and lava) as well as coal are considered to be the main sources of this radionuclide. A number of epidemiologic studies have shown the carcinogenicity of this element, particularly among miners and workers subjected to high level exposure in confined spaces such as basements, garages, cellars, etc. There are, however, some techniques to remove radon in order to reduce exposure to minimum values. [Italian] Il radon fu scoperto nel 1900, ma solo nel 1950 si comprese la sua potenziale pericolosita' per l'uomo. Il radon e' particolarmente pericoloso essendo un gas naturale radioattivo. Esso proviene dalla lunga catena di decadimento di radionuclidi come il torio e di radio. Sorgenti di tale radionuclide sono da considerarsi principalmente alcune rocce ignee (graniti, tufi e lave) e il carbone. Diversi studi epidemiologici hanno evidenziato la cancerogenicita' di tale elemento, specie tra i minatori e soggetti esposti ad alti livelli in ambienti confinati quali scantinati, garage sotterranei, ecc.. Esistono comunque tecniche di intervento per la rimozione del gas radon in modo tale da ridurre l'esposizione a valori minimi.

  13. Evolution of radon dose evaluation

    Directory of Open Access Journals (Sweden)

    Fujimoto Kenzo

    2004-01-01

    Full Text Available The historical change of radon dose evaluation is reviewed based on the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR reports. Since 1955, radon has been recognized as one of the important sources of exposure of the general public. However, it was not really understood that radon is the largest dose contributor until 1977 when a new concept of effective dose equivalent was introduced by International Commission on Radiological Protection. In 1982, the dose concept was also adapted by UNSCEAR and evaluated per caput dose from natural radiation. Many researches have been carried out since then. However, lots of questions have remained open in radon problems, such as the radiation weighting factor of 20 for alpha rays and the large discrepancy of risk estimation among dosimetric and epidemiological approaches.

  14. Communicating the risk from radon

    International Nuclear Information System (INIS)

    Fisher, A.; McClelland, G.H.; Schulze, W.D.; Doyle, J.K.

    1991-01-01

    A prominent television station developed a special series of newscasts and public service announcements about radon. This was combined with their advertising of the availability of reduced-price radon test kits in a local supermarket chain. The large number of test kits sold was a success from a marketing perspective, but not from a public health perspective - especially because of the very small share of high readings that were mitigated. In contrast, a study of housing sales showed a much higher testing rate and corresponding mitigation when risk communication accompanied the housing transaction, rather than being directed toward the general public. This paper examined the relative effectiveness of these alternative approaches to radon risk communication, emphasizing the implications for developing and implementing radon programs

  15. Radon in soils: intercomparative studies

    International Nuclear Information System (INIS)

    Segovia, N.; Galle, C.; Seidel, J.-L.; Monnin, M.

    1988-01-01

    Two kinds of experiments were designed to evaluate some of the variations that can be expected from radon in soil concentrations as monitored by closely spaced solid state nuclear track detectors (SSNTDs). Measurements were performed by the Insituto Nacional de Investigations Nucleares in Mexico and the Laboratoire de Physique Corpusculaire in France. The first experimental design consisted of a series of 15 day exposures of twenty monitoring devices placed inside a single bore hole. Fluctuations obtained in the radon levels at the twenty closely spaced monitoring sites ranged from 9% to 33%. The second experiment was performed with 4 pairs of radon monitoring devices located at 4 different sites at the summit of the Nevado de Toluca volcano. Results show that the SSNTD technique is well suited for radon measurements intended for geophysical studies. (author)

  16. Radon in soils: intercomparative studies

    Energy Technology Data Exchange (ETDEWEB)

    Segovia, N.; Galle, C. (Instituto Nacional de Investigaciones Nucleares, Mexico City (Mexico)); Seidel, J.-L.; Monnin, M. (Clermont-Ferrand-2 Univ., 63 - Aubiere (France). Lab. de Physique Corpusculaire)

    1988-01-01

    Two kinds of experiments were designed to evaluate some of the variations that can be expected from radon in soil concentrations as monitored by closely spaced solid state nuclear track detectors (SSNTDs). Measurements were performed by the Insituto Nacional de Investigations Nucleares in Mexico and the Laboratoire de Physique Corpusculaire in France. The first experimental design consisted of a series of 15 day exposures of twenty monitoring devices placed inside a single bore hole. Fluctuations obtained in the radon levels at the twenty closely spaced monitoring sites ranged from 9% to 33%. The second experiment was performed with 4 pairs of radon monitoring devices located at 4 different sites at the summit of the Nevado de Toluca volcano. Results show that the SSNTD technique is well suited for radon measurements intended for geophysical studies. (author).

  17. Residential radon survey in Finland

    International Nuclear Information System (INIS)

    Arvela, H.; Maekelaeinen, I.; Castren, O.

    1993-02-01

    The study measured the indoor radon concentration in the dwellings of 3074 persons, selected randomly from the central population register of Finland. Alpha track detectors and two consecutive half year measuring periods were used. The national mean of indoor radon concentration for persons living in low-rise residential buildings as well as blocks of flats was 145 and 82 Bq/m 3 , respectively. The mean for the total population was 123 Bq/m 3 . Based on the decision of the Ministry of Social Affairs and Health in 1992, the indoor radon concentration should not exceed 400 Bq/m 3 in already existing houses, the target for new construction being less than 200 Bq/m 3 . According to the study, the percentage of the Finnish population living in houses with an indoor radon concentration exceeding 200, 400 and 800 Bq/m 3 was 12.3 %, 3.6 % and 1.0 %

  18. Constraining radon backgrounds in LZ

    Science.gov (United States)

    Miller, E. H.; Busenitz, J.; Edberg, T. K.; Ghag, C.; Hall, C.; Leonard, R.; Lesko, K.; Liu, X.; Meng, Y.; Piepke, A.; Schnee, R. W.

    2018-01-01

    The LZ dark matter detector, like many other rare-event searches, will suffer from backgrounds due to the radioactive decay of radon daughters. In order to achieve its science goals, the concentration of radon within the xenon should not exceed 2 µBq/kg, or 20 mBq total within its 10 tonnes. The LZ collaboration is in the midst of a program to screen all significant components in contact with the xenon. The four institutions involved in this effort have begun sharing two cross-calibration sources to ensure consistent measurement results across multiple distinct devices. We present here five preliminary screening results, some mitigation strategies that will reduce the amount of radon produced by the most problematic components, and a summary of the current estimate of radon emanation throughout the detector. This best estimate totals < 17.3 mBq, sufficiently low to meet the detector's science goals.

  19. BPA radon field monitoring study

    International Nuclear Information System (INIS)

    Thor, P.W.

    1984-01-01

    To learn more about radon in homes, and in particular, to determine the concentrations and ranges of concentrations in typical Pacific Northwest residences, the Bonneville Power Administration (BPA) conducted a Radon Field Monitoring Study during the 1982-83 winter heating season. Approximately 290 Northwest homeowners received up to three small passive radon detectors with instructions for deployment within their homes. After two to three months of exposure the detectors were returned for processing and analysis. Radon concentrations and basic house information were obtained for 270 houses located in just over 100 different locations in the region. Results of the monitoring and statistical analyses completed on the data are presented. Histograms are shown indicating the ranges of concentrations in various spaces within a residence. Correlations between these concentrations and house characteristics and construction styles are also presented

  20. BPA radon field monitoring study

    International Nuclear Information System (INIS)

    Thor, P.W.

    1984-01-01

    To learn more about radon in homes, and in particular, to determine the concentrations and ranges of concentrations in typical Pacific Northwest residences, the Bonneville Power Administration (BPA) conducted a Radon Field Monitoring Study during the 1982-83 winter heating season. Approximately 290 Northwest homeowners received up to three small passive radon detectors with instructions for deployment within their homes. After two to three months of exposure the detectors were returned for processing and analysis. Radon concentrations and basic house information were obtained for 270 houses located in just over 100 different locations in the region. Results of the monitoring and statistical analyses completed on the data will be presented. Histograms will be shown indicating the ranges of concentrations in various spaces within a residence. Correlations between these concentrations and house characteristics and construction styles will also be presented. 11 figures

  1. Accidents Vasculaires Cerebraux (AVC) au Centre Hospitalier ...

    African Journals Online (AJOL)

    But: décrire les aspects épidémiologiques et évolutifs des AVC au CHU Kara. Méthodologie: Il s'est agi d'une étude prospective transversale monocentrique de cas d'AVC colligés du 1er juillet 2014 au 31 décembre 2015 dans le service de neurologie du CHU- KARA. Résultats: Cent soixante-quatre (164) patients ont ...

  2. Les bienfaits pour la santé et la prédominance du sucre dans les céréales pour déjeuner destinées aux enfants au Canada

    Directory of Open Access Journals (Sweden)

    Monique Potvin Kent

    2017-01-01

    Full Text Available Introduction : Cette étude vise à comparer le contenu nutritionnel et les bienfaits pour la santé des céréales pour déjeuner destinées aux enfants et celles non destinées aux enfants et à évaluer la prédominance du sucre ajouté dans ces produits. Méthodologie : Nous avons recueilli des données sur le contenu nutritionnel de 262 céréales pour déjeuner vendues dans les cinq principales chaînes d’alimentation à Ottawa (Ontario et à Gatineau (Québec. Pour chaque céréale, nous avons pris en note les cinq premiers ingrédients et la quantité de sucres ajoutés indiqués sur la liste des ingrédients. Les diverses marques de céréales ont été ensuite classées en deux catégories, soit « plus saines » ou « moins saines », à l’aide du modèle de profil nutritionnel du Royaume-Uni. Nous avons évalué chaque céréale en fonction de divers critères afin de déterminer si elle était destinée ou non aux enfants. Des comparaisons statistiques ont été établies entre les céréales destinées aux enfants et les autres. Résultats : Sur l'ensemble des céréales pour déjeuner, 19,8 % étaient destinées aux enfants et contenaient beaucoup moins de gras et de gras saturés. Ces céréales avaient une teneur en sodium et en sucre significativement plus élevée et une teneur en fibres et en protéines plus faible, et elles étaient trois fois plus susceptibles d’être classées comme « moins saines » par rapport aux céréales non destinées aux enfants. Aucune des céréales destinées aux enfants n’était sans sucre et, pour 75 % d’entre elles, le sucre occupait le deuxième rang dans la liste des ingrédients. Six entreprises de céréales pour déjeuner possédaient une gamme de produits destinés aux enfants composée entièrement de céréales « moins saines ». Conclusion : Il est nécessaire d’adopter un règlement qui limite le marketing alimentaire ciblant les enfants et les jeunes de moins de 17

  3. Radon measurement studies in Kazakhstan

    International Nuclear Information System (INIS)

    Sevost'yanov, V.N.

    2003-01-01

    Today, one has to admit that despite the important role and certain achievements in providing the radiation control in Kazakhstan, radon measurements still present some problems related to clear definition of physical quantities applied, correct use of methods, and application of adequate measuring devices to meet requirements of regulatory documents currently in effect, such as NRB-99. The paper provides some data on radon measurements, describes the problem status in Kazakhstan and proposes ways to solve it. (author)

  4. Radon in Brazilian underground mines.

    Science.gov (United States)

    Ayres da Silva, Anna Luiza Marques; Eston, Sérgio Médici; Iramina, Wilson Siguemasa; Francisca, Diego Diegues

    2018-02-14

    Radon is a chemically inert noble radioactive gas found in several radioactive decay chains. In underground mines, especially those that contain or have contained ores associated with uranium-bearing minerals, workers might be exposed to high levels of radon and its decay products (RDP). This work aimed to investigate whether the exposure of workers to radon gas and its progeny has been evaluated in Brazilian non-uranium and non-thorium underground mines. If so, the results and control measures undertaken or recommended to maintain the concentrations under Brazilian occupational exposure limits (OELs) were documented. The adopted methodology consisted of three main phases. The first was an extensive bibliographical survey of the concentration levels of radon and RDP, and the radiation dose estimates, considering measurements made heretofore by various Brazilian researchers and exhibiting original measurement work undertaken by the one of the authors (mine O). In the second phase, the values obtained were compared with OELs. In the third phase, it was verified whether any control measures were undertaken in the mines with high exposure of workers to radon and its progeny, and if so, the adopted controls were determined. Data of radon concentration obtained from 52 campaigns in 40 underground mines were analyzed. The results showed that the assessment of the exposure of workers to radon and its progeny was undertaken in many mines at least once, and that in 62.5% of the mines, when visited for the first time, the radon levels throughout them were below the Brazilian OELs. As expected, the main control measure adopted or recommended was the improvement of the ventilation system. © 2018 IOP Publishing Ltd.

  5. Comparison of effectiveness of sub-slab ventilation systems for indoor radon mitigation: A numerical study; Comparaison a l`aide d`un outil numerique de l`efficacite des systemes de ventilation active du sol limitant la penetration du radon dans l`habitat

    Energy Technology Data Exchange (ETDEWEB)

    Bonnefous, Y.C. [Ecole Nationale des Travaux Publics de l`Etat, 69 - Vaulx en Velin (France). Lab. Sciences de l`Habitat]|[Lawrence Berkeley Lab., CA (United States); Gadgil, A.J. [Lawrence Berkeley Lab., CA (United States); Allard, F. [Institut National des Sciences Appliquees (INSA), 69 - Villeurbanne (France)

    1992-04-01

    The functioning of an active sub-slab ventilation system (SVS) has been studied successfully with the help of a previously evaluated numerical model. The parameters explored are the permeability of the sub-slab and the gravel placed beneath it, the amplitude of applied pressure at the installation point of the system and the functioning method: depressurization or pressurization. The mechanisms contributing to the success of the two systems are identified. This numerical study shows that the presence of a layer of gravel beneath the sub-slab considerably improves the performance of the SVS. Considered separately from the extremely permeable sub-slabs, the depressurization systems perform better than the pressurization systems. 17 refs. [Francais] Le fonctionnement des Systemes de Ventilation active du Sol (SVS) a ete etudie a l`aide d`un outil numerique precedemment evalue avec succes. Les parametres explores sont les permeabilites du sol et du gravier place sous plancher bas, l`amplitude de la pression appliquee au point d`installation du systeme, et le mode de fonctionnement: Depressurisation ou Pressurisation. Les mecanismes contribuant au succes des deux systemes sont identifies. Cette etude numerique montre que la presence d`une couche de gravier sous plancher bas ameliore de facon considerable les performances des SVS. Mis a part le cas des sols extremement permeables, les systemes de Depressurisation ont de meilleures performances que les systemes de Pressurisation. 17 refs.

  6. Contribution du warrantage à l'accès des petits producteurs au ...

    African Journals Online (AJOL)

    Contribution du warrantage à l'accès des petits producteurs au marché des intrants et des produits agricoles dans les communes rurales de Kléla, Fama et Zebala dans la région de Sikasso au Mali. D Sogodogo, O Dembele, S Konate, S Koumare ...

  7. Radon gas detector

    International Nuclear Information System (INIS)

    Madnick, P.A.; Sherwood, R.W.

    1990-01-01

    This patent describes a radon gas detector. It comprises: a housing having an interior chamber, the interior chamber being completely closed to ambient light, the interior chamber being divided into an environment connecting chamber and a radiation ascertaining chamber; radiation sensitive means mounted between the environment connecting chamber and the radiation ascertaining chamber; air movement means mounted in connection with the environment connecting chamber. The air movement means for moving ambient air through the environment connecting chamber; electronic means for detecting radiation within the air which is passing through the environment connecting chamber. The electronic means also including radiation counting means. The electronic means producing an output based on the type and quantity of radiation in the environment connecting chamber; and display electronics for receiving the output and displaying accordingly a display representative of the amount and type of radiation located within the environment connecting chamber and hence within the ambient air

  8. Indoor radon and radon daughters survey at Campinas-Brazil using CR-39: First results

    CERN Document Server

    Guedes, S; Iunes, P J; Navia, L M S; Neman, R S; Paulo, S R; Rodrigues, V C; Souza, W F; Tello, C A S; Zúñiga, A G

    1999-01-01

    The first results of a radon and radon daughters (RD) survey performed at Campinas-SP, Brazil, are presented. We employed a technique that, potentially, makes possible to measure the radon and RD activity in the air and to separate from this result the activity of radon, alone. In this preliminary paper only the former activity is studied.

  9. Radon legislation and national guidelines

    International Nuclear Information System (INIS)

    Aakerblom, G.

    1999-07-01

    The International Commission on Radiological Protection (ICRP) and The Council of the European Union have recommended the Member States to take action against radon in homes and at workplaces. Within the EU project European Research into Radon in Construction Concerted Action, ERRICCA, the Topic Group on Legal and Building Code Impact was designated to study the current radon legislation and give advice regarding future enactment of laws and recommendations. On behalf of the Group, a questionnaire on radon legislation was sent out to nearly all European states and a selection of non-European states. Questions were asked regarding reference levels for dwellings, workplaces and drinking water, and about regulations or recommendations for building materials and city planning. All 15 EU Member States, 17 non-EU European countries and 10 non-European countries responded to the questionnaire. Their answers are considered current as of the end of 1998. Most European States and many non-European countries have recommended reference levels for dwellings and workplaces, and some have guidelines for measures against radon incorporated in their building codes and guidelines for construction techniques. However, only a few countries have enforced reference levels or regulations for planning and construction. The reference levels for indoor radon concentration in existing and new dwellings or workplaces are within the range 150-1000 Bq/m 3 . Sweden is the only country (Out of 15 EU member states) which has enforced limits for existing dwellings. Sweden and the UK have both enforced levels for new dwellings. 7 non-European countries (Out of 17 responding countries) have enforced levels for existing dwellings and 9 have them for new dwellings. At the end of 1998, only Finland, Sweden, the Czech Republic, Romania, Russia and the Slovak Republic had limits for radon in water, although 8 countries were planning to introduce such limits. The present limits are within the range for 50

  10. Radon integral measurement system

    International Nuclear Information System (INIS)

    Garcia H, J.M.

    1994-01-01

    The Radon Integral Measurement System (SMIR) is a device designed specially to detect, to count and to store the data of the acquisition of alpha particles emitted by Radon-222 coming from the underground. The system includes a detection chamber, a radiation detector, a digital system with bateries backup and an auxiliary photovoltaic cell. A personal computer fixes the mode in which the system works, transmitting the commands to the system by the serial port. The heart of the system is a microprocesor working with interrupts by hardware. Every external device to the microprocessor sends his own interrupt request and the microprocessor handles the interrupts with a defined priority. The system uses a real time clock, compatible with the microprocessor, to take care of the real timing and date of the acquisition. A non volatile RAM is used to store data of two bytes every 15 minutes along 41 days as a maximum. After the setting up to the system by the computer, it can operate in stand alone way for up 41 days in the working place without the lose of any data. If the memory is full the next data will be written in the first locations of the memory. The memory is divided in pages corresponding every one of this to a different day of the acquisition. The counting time for every acquisition can be programmed by the user from 15 minutes to 65535 minutes but it is recommended to use a small time not to reach the limit of 65535 counts in every acquisition period. We can take information of the system without affecting the acquisition process in the field by using a lap top computer, then the information can be stored in a file. There is a program in the computer that can show the information in a table of values or in a bar graph. (Author)

  11. Mesure de la section efficace de production des quarks beaux et charmés à partir de leur désintegration semileptonique en électrons avec l'experience ATLAS dans les collisions protons-protons a sqrt(s) = 7 TeV au LHC.

    CERN Document Server

    Bordoni, Stefania

    Le thème central de la thèse est la mesure de la section efficace de production des électrons venant de la désintégration des quarks lourds (b et c) avec l'expérience ATLAS dans les collisions proton-proton à sqrt(s)=7 TeV au LHC. La calibration du calorimètre électromagnétique et la reconstruction des électrons jouent un rôle cardinal dans l'analyse développée dans cette thèse. Ces thématiques sont traitées dans la première partie du manuscrit. L'étude des systématiques liées à la variation des constantes de calibration paramètrant la chaîne de lecture du calorimètre et qui affectent la reconstruction de l'énergie des cellules est presentée. La description des procédures de reconstruction des événements dans le détecteur ATLAS est ensuite traitée. Les cas de mauvaise reconstruction sont abordés et une étude de l'estimation du taux des faux leptons dans des événements multi-jets est présentée. La deuxième partie de la thèse est dédiée à la mesure de la section ef...

  12. The use of volunteer radon measurements for radon mapping purposes: an examination of sampling bias issues.

    Science.gov (United States)

    Burke, Orlaith; Murphy, Patrick

    2011-09-01

    National and regional radon surveys are used in many nations to produce maps detailing the spatial variation of indoor radon concentrations. National surveys which are designed to be representative use either a geographically-weighted or a population-weighted sampling scheme. Additionally, many countries collect a large number of data on indoor radon concentrations from volunteers who have chosen to have the indoor radon concentration measured in their own dwellings. This work examines the representativeness of volunteer-based samples in radon measurement and explores the effect of potential volunteer bias on radon mapping results. We also investigate the influence that media attention has on volunteer sampling of indoor radon concentrations. The result of our work indicates that volunteer measurements are biased due to over-sampling of high radon areas. Consequently such volunteer radon measurements should not be used for radon mapping purposes.

  13. La construction de l’urgence au travail et ses effets suivant les statuts hiérarchiques : le cas des mécaniciens et des agents de maîtrise dans le secteur aérien

    OpenAIRE

    Monneuse, Denis

    2012-01-01

    Travailler dans l’urgence est devenu un impératif catégorique pour nombre de salariés. Cet impératif se double d’une injonction paradoxale : il faut que le travail soit « vite fait, bien fait ». Comment la légitimation de l’urgence est-elle construite ? Dans quelle mesure les salariés intériorisent-ils cette logique managériale ? Quelles différences note-t-on suivant leur statut hiérarchique ? Cet article vise à rendre compte d’une enquête menée au sein d’un centre de maintenance d’une compag...

  14. Mapping of groundwater radon potential

    International Nuclear Information System (INIS)

    Aekerblom, G.; Lindgren, J.

    1997-01-01

    The domestic use of water with elevated radon concentration may represent a public health hazard, partly due to the release of radon to the indoor air. While only a limited number of countries have implemented regulations with respect to radon in water, many more are considering doing so. The compulsory limits proposed by Swedish authorities are 100 Bq/1 for public water, while water from private wells is not to exceed 1000 Bq/1. Furthermore, it is recommended that water with a radon content above 500 Bq/1 should not be given to children under five years of age. In Sweden, the estimated number of wells with radon levels above 1000 Bq/1 exceeds 10,000, with a considerable amount in excess of 10,000 Bq/1. The highest radon concentration in a well supplying drinking water encountered so far is 57,000 Bq/1. Radon levels exceeding 500 Bq/1 are almost exclusively found in wells drilled into bedrock and in springs with intramontaneous water. Elevated ground water radon levels require that the water has passed through bedrock with elevated concentration of uranium, or through fractures with coatings of minerals containing enhanced concentrations of radium-226. Intramontaneous water from areas with uranium-bearing rock types (e.g. uranium-rich granites, pegmatites and vulcanites) often manifests elevated radon levels. Routines for the establishment of risk maps focusing on water are currently under development. The backbone of the process is the access to high spatial resolution radiometric information together with bedrock and soil information on a detailed scale (1:50,000). This information is available from the Geological Survey of Sweden, which is routinely carrying out airborne measurements at an altitude of 30 m and a line spacing of 200 m. While some 60% of Sweden is covered up to now, 75 % is expected to be covered within the next ten years. Other available databases utilized in the risk mapping process include radon measurements in wells, geochemical data from

  15. Le commerce des reptiles au Benin | Toudonou | Journal de la ...

    African Journals Online (AJOL)

    Four categories of actor animate these two trade-circuits: pick-ups, collectors, conditioners and consumers. Les reptiles sont diversement exploités dans le monde. Au Bénin et dans de nombreux pays africains, des spécimens entiers ou des organes d'agames, de crocodiles, de geckos, de scinques, de serpents, de tortues ...

  16. Measured radon inside housings the Republic Argentina

    International Nuclear Information System (INIS)

    Canoba, A.; Arnaud, M.; Lopez, F.; Oliveira, A.A.

    1998-01-01

    They have been measured the radon concentration in houses in different city's in Argentina Republic. For they were used it as method mensuration detectors appearances nuclear detecting electrets and detectors based on the adsorption radon in activated carbon

  17. Metakaolin as a radon retardant from concrete

    Energy Technology Data Exchange (ETDEWEB)

    Lau, B.M.F.; Balendran, R.V.; Yu, K.N

    2003-07-01

    Granite aggregates are known to be the radon source in concrete. Recently, metakaolin has been introduced as a partial substitution of Portland cement to produce high strength concrete. It can effectively reduce the porosity of both the matrix and the aggregate/paste transition zone, which suggests its ability to retard radon emission from concrete aggregates. In the present work, radon exhalation rates from concrete cubes substituted with metakaolin were measured using charcoal canisters and gamma spectroscopy, and were considerably lower than those from normal concrete, by about 30%. The indoor radon concentration reduction is estimated as {gamma}9 Bq m{sup -3} calculated using a room model, causing a 30% reduction in the indoor radon concentration and the corresponding radon dose. Therefore, metakaolin is a simple material to reduce the indoor radon concentration and the radon dose. (author)

  18. An overview of Ireland's National Radon Policy

    International Nuclear Information System (INIS)

    Long, S.; Fenton, D.

    2011-01-01

    In Ireland radon is a significant public health issue and is linked to 150-200 lung cancer deaths each year. Irish National Radon Policy aims to reduce individual risk by identifying and remediating buildings with high radon concentrations and also to reduce collective dose through radon prevention as required by revised building regulations. Achievements to date are significant and include the completion of the National Radon Survey, the testing of every school in Ireland, the on-going testing of social housing, collaboration between the public health and radiation protection authorities and the inclusion of radon in inspections of workplaces. However, this work now needs to be drawn together centrally to comprehensively address the radon problem. The RPII and the relevant central governing department, the Dept. of Environment, Heritage and Local Government are currently working to constitute a group of key experts from relevant public authorities to drive the development of a National Radon Control Strategy. (authors)

  19. Comparative survey of outdoor, residential and workplace radon concentrations

    International Nuclear Information System (INIS)

    Barros, Nirmalla; Field, R. William; Field, Dan W.; Steck, Daniel J.

    2015-01-01

    This study investigated radon concentrations in above-ground (i.e. first floor) workplace in Missouri and compared them with above-ground radon concentrations in nearby homes and outdoor locations. This study also examined the potential utility of using home and outdoor radon concentrations to predict the radon concentration at a nearby workplace (e.g. county agencies and schools). Even though workplace radon concentrations were not statistically different from home radon concentrations, the radon concentration at a particular home, or outdoor location, was a poor predictor of the radon concentration at a nearby workplace. Overall, 9.6 and 9.9 % of homes and workplace, respectively, exhibited radon concentrations of ≥148 Bq m -3 . Because of the percentage of workplace with elevated radon concentrations, the results suggest that additional surveys of workplace radon concentrations are needed, especially in areas of high radon potential, to assess the contribution of workplace radon exposure to an individual's overall radon exposure. (authors)

  20. Radon concentration in a house of Calvados

    International Nuclear Information System (INIS)

    Leleyter, L.; Riffault, B.; Mazenc, B.

    2010-01-01

    Recent studies indicate a link between the risk of lung cancer and residential radon exposure. However, in France, awareness of this problem was made relatively late. Accordingly this study examines the radon concentration in a private home in Calvados (Normandy region). Findings show that the presence of a fireplace in a house can accelerate radon convective transfer, and that simple adjustments to interior and exterior accommodation can significantly reduce radon concentrations in the home. (authors)

  1. Radon turnover in water supply facilities

    International Nuclear Information System (INIS)

    Hingmann, H.; Korte, T.; Peeck, D.A.; Weber, U.

    1998-01-01

    In three Hessian waterworks facilities concentrations of Radon and Radon decay products were measured. Both, the concentrations in indoor air resulting in radiation exposure of workers, and the concentration in ground water at different stages of processing were determined. Furthermore, parameters on exposure other than Radon concentration are considered. Due to the minor yields of Radon there is no need for radiation protection recommendations with respect to occupational safety. (orig.) [de

  2. Local Radon Descriptors for Image Search

    OpenAIRE

    Babaie, Morteza; Tizhoosh, H. R.; Khatami, Amin; Shiri, M. E.

    2017-01-01

    Radon transform and its inverse operation are important techniques in medical imaging tasks. Recently, there has been renewed interest in Radon transform for applications such as content-based medical image retrieval. However, all studies so far have used Radon transform as a global or quasi-global image descriptor by extracting projections of the whole image or large sub-images. This paper attempts to show that the dense sampling to generate the histogram of local Radon projections has a muc...

  3. Developmental toxicology of radon exposures

    International Nuclear Information System (INIS)

    Sikov, M.R.; Cross, F.T.; Mast, T.J.; Palmer, H.E.; James, A.C.; Thrall, K.D.

    1992-01-01

    Concerns about hazards associated with radon exposure in dwellings may be especially relevant to pregnant women, many of whom spend substantial amounts of time in their homes. There are few data concerning the placental transfer and fetoplacental distribution of inhaled radon and decay products or their effects on the conceptus. We performed a study in rats to determine if prenatal effects could be produced by prolonged inhalation exposures to high concentrations of radon throughout gestation. A group of 43 pregnant rats was exposed 18 h d -1 , at a rate of 124 working level months (WLM) per day, from 6 to 19 days of gestation (dg), of radon and daughters adsorbed onto ore dust. A group of 26 pregnant rats from the same shipment was exposed to a filtered-air atmosphere as controls. At 20 dg, the rats were removed from the chambers, killed, and necropsied. The fetuses were evaluated for the presence of toxic effects, which included detailed teratology protocols. These exposures did not produce detectable reproductive toxicity nor teratogenic change. Two other rats were removed from the radon chambers during the last day of exposure, and their tissues were analyzed to determine the distribution of radioactivity and for dosimetry. Samples from these rats suggested that the dose rates to the placenta were roughly threefold those to the fetus but were similar to those to the liver and femur of the pregnant rats. These data indicate that the dose to the conceptus from the decay of placentally transferred radon and its progeny is more important than the contribution of translocated decay products. Translocated radon decay products are an important source of radiation doses to placental structures, however, and may have most of the radioactivity content at birth

  4. Gouvernance et gestion des ressources communes au Vietnam ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Gouvernance et gestion des ressources communes au Vietnam. La subvention permettra au Collège d'agriculture et de foresterie de l'Université de Huê de se pencher sur des questions reliées à la gestion des ressources communes et à la pauvreté dans ... New funding opportunity for gender equality and climate change.

  5. The radon: evaluation and risk management

    International Nuclear Information System (INIS)

    Lacoste, A.C.; Masse, R.; Aurengo, A.; Erich Wichmann, H.; Timarche, M.; Laurier, D.; Robe, M.Ch.; Baubron, J.C.; Bonijoly, D.; Collignan, B.; Berrier, H.; Jaouen, J.; Caamano, D.; Guiot, F.; Grall, B.; Frutos Vasquez, B.; Olaya Adan, M.; Garcia Cadierno, J.P.; Martin Matarranz, J.L.; Serrano Renedo, J.; Suarez Mahou, E.; Fernandez, J.A.; Mjones, L.; Pirard, P.; Godet, J.L.; Rougy, Ch.

    2003-01-01

    The radon exposure constitutes for the French population the first cause of natural irradiation among the different natural sources of irradiation. It is possible to have a significant action on it, either by making draught proof in order to avoid to radon to get inside houses, either by ventilating in order to dispel the radon and improve air quality. (N.C.)

  6. The risks from radon in homes

    International Nuclear Information System (INIS)

    Duggan, M.J.

    1990-01-01

    A report has been proposed by a Working group of the Institute of Radiation Protection on the risks from radon in homes. The report includes a historical perspective, properties and behavior of radon and its daughters, measurement of radon exposure in UK homes, remedial action, quantification of the risk and lifetime risks from other causes. (UK)

  7. Radon in dwellings: Investigations and measurements

    International Nuclear Information System (INIS)

    Steger, F.; Stadtmann, H.; Kindl, P.; Breitenhuber, L.

    1989-01-01

    The inhalation of radon is an important contributor to the radiation burden for occupants of buildings. The aim of this report is to give an overview on different measuring devices for radon. Results of a pilot study and an assessment of the mean annual effective whole body dose due to inhalation of radon are given. 8 refs., 3 figs. (Author)

  8. Modelling of radon transport in porous media

    NARCIS (Netherlands)

    van der Graaf, E.R.; de Meijer, R.J.; Katase, A; Shimo, M

    1998-01-01

    This paper aims to describe the state of the art of modelling radon transport in soil on basis of multiphase radon transport equations. Emphasis is given to methods to obtain a consistent set of input parameters needed For such models. Model-measurement comparisons with the KVI radon transport

  9. Reducing Radon in Schools: A Team Approach.

    Science.gov (United States)

    Ligman, Bryan K.; Fisher, Eugene J.

    This document presents the process of radon diagnostics and mitigation in schools to help educators determine the best way to reduce elevated radon levels found in a school. The guidebook is designed to guide school leaders through the process of measuring radon levels, selecting the best mitigation strategy, and directing the efforts of a…

  10. Control of radon in Finnish workplaces

    International Nuclear Information System (INIS)

    Markkanen, M.

    2002-01-01

    Natural radiation in Finland is regulated in the Finnish Radiation Act from 1992. Occupational exposure to natural radiation is regulated by an amendment of the Radiation Decree in 1998. The most important issues in Finland are radon in workplaces, radioactivity in drinking water and in building materials, and mining and industrial processes. Radon levels in mines have been measured regularly since 1972. Finland has an action level for radon in workplaces of 400 Bq/m 3 . Radon prone areas have been identified primarily from measurements of radon in dwellings. Radon measurements are compulsory in workplaces in radon prone areas unless it can be shown by other means that radon levels are low. A programme focusing on radon in workplaces was initiated in 1992. To date, radon measurements have been carried out in 10,000 workplaces and remedial actions have been taken in 200 of these. The average reduction in radon concentration in remediated buildings is about 1,500 Bq/m 3 . Identification of NORM industries is based on the radionuclide content of the materials used (>1.4 Bq/g U and >0.4 Bq/g Th). The occupational exposure should not exceed 1 mSv/y (excluding radon)

  11. Taking Account of Gender Differences When Designing Interventions in Occupational Health? Lessons from a Study of the "Healthy Enterprise" Standard in Québec: Les différences de genre sont-elles prises en compte lors de la conception des interventions de prévention en santé au travail? Résultats d une étude sur la norme "Entreprises en Santé" dans les entreprises au Québec.

    Science.gov (United States)

    Sultan-Taïeb, Hélène; St-Hilaire, France; Lefebvre, Rébecca; Biron, Caroline; Vézina, Michel; Brisson, Chantal

    2017-11-01

    The literature shows substantial differences in occupational exposures between men and women, both between and within occupations, but remains very sparse on whether interventions are tailored to gender differences in the workplace. Our objective was to determine whether gender differences are taken into account when designing prevention interventions. This study is part of a project on the evaluation of interventions implemented in the framework of the "Healthy Enterprise" standard in Quebec organizations. Three sets of quantitative and qualitative data were collected in seven organizations and triangulated. Our results show that in the process of elaborating and implementing activities, the main objectives were to reach a maximum number of workers and meet the needs identified in a health and risk diagnosis. Activities were not tailored to the needs of specific subgroups of employees, such as gender or age. Not distinguishing men's and women's situations in this diagnosis may play a role in intervention design. Résumé La littérature montre des différences d'exposition au travail importantes entre les hommes et les femmes, y compris à catégories d'emploi identiques. Les études sur l'adaptation des interventions de prévention aux différences de genre dans les milieux de travail sont quasiment inexistantes dans la littérature. Notre objectif était de déterminer dans quelle mesure les différences de genre sont prises en compte lors de la conception des interventions de prévention. Cette étude fait partie d'un projet d'évaluation des interventions mises en œuvre dans le cadre de la norme «Entreprises en santéé au Québec. Trois séries de données quantitatives et qualitatives ont été collectées auprès de sept organisations et analysées par triangulation. Nos résultats montrent que lors du processus d'élaboration des activités, les principaux objectifs étaient d'atteindre un nombre maximal de travailleurs et de remplir les besoins identifi

  12. Le Cercle de vie : l'agriculture biologique au Mexique | CRDI ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    13 juil. 2011 ... À Guadalajara, dans l'État du Jalisco, au Mexique, cinq ou six agriculteurs vendent toutes les deux semaines leurs produits biologiques d'alimentation et de nettoyage domestique dans un minuscule marché, dans la cour d'un participant accueillant.Pour Danielle Schami, productrice et réalisatrice du ...

  13. Comparison of radon doses based on different radon monitoring approaches.

    Science.gov (United States)

    Vaupotič, Janja; Smrekar, Nataša; Žunić, Zora S

    2017-04-01

    In 43 places (23 schools, 3 kindergartens, 16 offices and one dwelling), indoor radon has been monitored as an intercomparison experiment, using α-scintillation cells (SC - Jožef Stefan Institute, Slovenia), various kinds of solid state nuclear track detectors (KfK - Karlsruhe Institute of Technology, Germany; UFO - National Institute of Radiological Sciences, Chiba, Japan; RET - University College Dublin, Ireland) and active electronic devices (EQF, Sarad, Germany). At the same place, the radon levels and, consequently, the effective doses obtained with different radon devices differed substantially (by a factor of 2 or more), and no regularity was observed as regards which detector would show a higher or lower dose. Copyright © 2016 Elsevier Ltd. All rights reserved.

  14. HYPERTENSION AU COURS DE LA GROSSESSE: Aspects ...

    African Journals Online (AJOL)

    hypertension soit une prévalence de 8,2%. Cette pathologie survient dans notre .... consultations prénatales ou le post-partum. Sur le plan clinique, la ... des patientes étaient au terme de leur grossesse alors que 22.11%, avaient un âge ...

  15. Les Modalites Evolutives Du Zona Au Cours De L\\'infection A Vih Au ...

    African Journals Online (AJOL)

    Introduction et But Peu d\\'informations sont disponibles sur les complications du zona et la prise en charge globale de cette maladie chez les patients VIH-positifs dans les pays d\\'Afrique sub Saharienne à l\\'instar du Cameroun. Le taux de séroprévalence du VIH dans la population adulte générale au Cameroun à été ...

  16. Les feux de Pentecôte au royaume du Siècle. L’économie des charismes dans le pentecôtisme suédois

    Directory of Open Access Journals (Sweden)

    Emir Mahieddin

    2012-09-01

    Full Text Available Le pentecôtisme participe des mouvements de renouveau religieux qui ont amené, du fait de leur succès, à parler d’un « retour du refoulé » – selon les mots de Gilles Kepel –, une expression venue aujourd’hui remplacer le paradigme de la sécularisation, dominant en sociologie des religions depuis le début du XXe siècle. Cet article repose sur une étude ethnographique menée dans la ville de Jönköping, bastion du protestantisme born again dans un pays, la Suède, pourtant réputé le plus sécularisé du monde. L’auteur entend interroger les adaptations éventuelles que le pentecôtisme a pu mettre en place pour faire accepter sa présence au sein d’un environnement archi-sécularisé. Il apparaît ainsi que le « retour du religieux » ne s’appuie pas que sur une rhétorique du conflit ou de l’offensive avec l’idéologie de la sécularité mais tente une coexistence négociée avec son environnement d’accueil, aussi neutralisé d’influence religieuse soit-il.Pentecostalism is part of the revivalist movements that led, because of its success to speak of a « return of the repressed » – in the words of Gilles Kepel – an expression coming today to replace the paradigm of secularization, dominant in the sociology of religion since the beginning of the Twentieth century. This article is based on an ethnographic study conducted in the city of Jönköping, a bastion of born again Protestantism in one country, Sweden, reputedly the most secularized in the world. The author intends to examine the possible adaptations that Pentecostalism has set up to make his presence accepted in a very secular environment. It thus appears that the « return of religion » does not only rely on the rhetoric of conflict against the ideology of secularism but attempts to settle a negotiated coexistence with its hosting environment however free of religious influence that it might be.El pentecostalismo es parte de los

  17. De l’effritement à l’androgyne : l’image du couple dans le roman québécois contemporain au féminin De l’effritement à l’androgyne : l’image du couple dans le roman québécois contemporain au féminin

    Directory of Open Access Journals (Sweden)

    Denisa-Adriana Oprea

    2010-05-01

    Full Text Available À travers l’analyse d’un corpus de romans québécois contemporains, nous tentons ici de baliser les éléments d’un parcours qui va de l’effritement à l’androgyne. Cette évolution est symptomatique tant de la remise en question du couple qu’engendre le féminisme radical que du passage du féminisme de la deuxième vague au féminisme de la troisième vague. Les romans que nous avons retenus sont Le sexe des étoiles (1987, de Monique Proulx, Copies conformes (1989, de Monique LaRue et la trilogie Soifs de Marie-Claire Blais.À travers l’analyse d’un corpus de romans québécois contemporains, nous tentons ici de baliser les éléments d’un parcours qui va de l’effritement à l’androgyne. Cette évolution est symptomatique tant de la remise en question du couple qu’engendre le féminisme radical que du passage du féminisme de la deuxième vague au féminisme de la troisième vague. Les romans que nous avons retenus sont Le sexe des étoiles1 (1987, de Monique Proulx, Copies conformes2 (1989, de Monique LaRue et la trilogie Soifs3 de Marie-Claire Blais.

  18. Radon chamber for soil gas detectors

    International Nuclear Information System (INIS)

    Andersson, P.

    1987-01-01

    Swedish Geological Co (SGAB) has designed and constructed a chamber for the calibration of detectors and instruments intended for the measurement of radon-222 in soil gas. In the chamber radon detectors may be exposed in a model environment which simulates ground conditions with respect to radon concentration, temperature and humidity. Also included in the research project is the development of methods for calibration procedures, together with test measurements. In general, these measurements indicate that the radon detectors tested are sufficiently accurate and reliable for radon measurements in Swedish soils if they are calibrated in an environment which simulates ground conditions. (orig./HP)

  19. Consequences of using home-made radon sources for measuring the radon diffusion coefficient

    International Nuclear Information System (INIS)

    Dobrovolny, T.; Jiranek, M.

    2017-01-01

    The applicability of home-made radon sources for determining the radon diffusion coefficient of waterproofing materials was studied for three representatives of materials with a high radium content: uraninite, slag concrete and filter sand. The results of our investigation confirmed that the radon production rate of home-made radon sources is significantly lower than the radon production rate of artificial sources. Consequently, home-made sources are usually unable to generate concentrations higher than 100 kBq/m 3 in the source container. Therefore, they cannot be used for determining radon diffusion coefficients lower than 1 x 10 -12 m 2 /s. In addition, when home-made radon sources are used, only time-dependent mathematical solutions of the non-stationary radon diffusion can be used for determining the radon diffusion coefficient from the measured data. (authors)

  20. L’apprentissage au cern

    CERN Multimedia

    2007-01-01

    pour les professions d’électronicien(ne) et de laborantin(e) en physique L’apprentissage au CERN est régi par les lois, règlements et contrats en vigueur dans le canton de Genève. En cas de réussite à l’examen de fin d’apprentissage, les apprentis obtiennent le Certificat fédéral de capacité suisse (CFC). 6 places au total sont ouvertes au recrutement pour les deux professions. L’apprentissage dure 4 ans. Minima requis pour faire acte de candidature : avoir au moins 15 ans et moins de 21 ans à la date de début de l’apprentissage ; avoir terminé la scolarité obligatoire, au minimum 9e du Cycle d’orientation genevois (3e en France) ; être ressortissant d’un pays membre du CERN (Allemagne, Autriche, Belgique, Bulgarie, Danemark, Espagne, Finlande, France, Grèce, Hongrie, Italie, Norvège, Pays-Bas, Pologne, Portugal, Royaume-Uni, République tchèque, République slovaque , Suède, Suisse) ; pour les résidents en Suisse : être ressortissant su...

  1. Des institutions au service de villes sûres et inclusives au Venezuela

    International Development Research Centre (IDRC) Digital Library (Canada)

    Caracas, au Venezuela, est l'une des villes les plus violentes au monde; il s'y commet 122 homicides par tranche de 100 000 habitants. Selon les experts en violence urbaine, les inégalités sociales et la disparité des revenus sont étroitement liées à l'ampleur de la violence, mais cette théorie ne tient pas dans le cas ...

  2. Face au risque

    CERN Document Server

    Grosse, Christian; November, Valérie

    2007-01-01

    Ce volume collectif sur le risque inaugure la collection L'ÉQUINOXE. Ancré dans l'histoire pour mesurer les continuités et les ruptures, il illustre la manière dont les sciences humaines évaluent et mesurent les enjeux collectifs du risque sur les plans politiques, scientifiques, énergétiques, juridiques et éthiques. Puisse-t-il nourrir la réflexion sur la culture et la prévention du risque. Ses formes épidémiques, écologiques, sociales, terroristes et militaires nourrissent les peurs actuelles, structurent les projets sécuritaires et constituent - sans doute - les défis majeurs à notre modernité. Dans la foulée de la richesse scientifique d'Equinoxe, L'ÉQUINOXE hérite de son esprit en prenant à son tour le pari de contribuer - non sans risque - à enrichir en Suisse romande et ailleurs le champ éditorial des sciences humaines dont notre société a besoin pour forger ses repères. Après Face au risque suivra cet automne Du sens des Lumières. (MICHEL PORRET Professeur Ordinaire à la F...

  3. Radon monitoring technique with electret collecting

    International Nuclear Information System (INIS)

    Tian Zhiheng; Zuo Fuqi; Xiao Detao; Zhao Xkiuliang

    1991-12-01

    The integrating radon monitoring technique with electret collecting is a method which collects the 218 Po + positive ions by electrostatic field produced by electret. It has greatly improved the sensitivity of radon measurement. The response factor of this method reaches to 4.7 cm -2 Bq -1 m 3 h -1 , 1000 times larger than that of common passive sampling method. The monitoring device and its principle are introduced. The measuring results of radon concentration and radon flux rate and quality assurance system by using this method in the Qinshan Nuclear Power Plant, Human Environmental Monitoring Central Station and some uranium mines are also presented. The analytical results show that the radon concentration in the Qinshan Nuclear Power Plant is affected by wind direction. When wind directs toward sea, the radon concentration is high. If the wind is to the contrary, it is low. The radon concentration ratio of both is about 2

  4. Characterizing the source of radon indoors

    International Nuclear Information System (INIS)

    Nero, A.V.; Nazaroff, W.W.

    1983-09-01

    Average indoor radon concentrations range over more than two orders of magnitude, largely because of variability in the rate at which radon enters from building materials, soil, and water supplies. Determining the indoor source magnitude requires knowledge of the generation of radon in source materials, its movement within materials by diffusion and convection, and the means of its entry into buildings. This paper reviews the state of understanding of indoor radon sources and transport. Our understanding of generation rates in and movement through building materials is relatively complete and indicates that, except for materials with unusually high radionuclide contents, these sources can account for observed indoor radon concentrations only at the low end of the range observed. Our understanding of how radon enters buildings from surrounding soil is poorer, however recent experimental and theoretical studies suggest that soil may be the predominant source in many cases where the indoor radon concentration is high. 73 references, 3 figures, 1 table

  5. Interaction of radon progeny with atmospheric aerosols

    International Nuclear Information System (INIS)

    Morawska, Lidia

    1994-01-01

    The radiological health hazard due to the airborne radon progeny depends on three factors (i) radon concentration in the air, (ii) radon progeny concentration, and (iii) active particle size distribution. Conclusions as to the health hazard cannot be drawn without full understanding of the interaction mechanisms between radon progeny and atmospheric aerosols. The aim of this work was to study the interaction mechanisms between radon progeny, natural environmental aerosols and environmental tobacco smoke (ETS). The experiments were performed under controlled laboratory conditions of radon concentration (1.85 and 3.70 Bq m -3 ), relative humidity (35, 50, 75 and 95%) and ETS generation. The size distribution of radioactivity carrying aerosols was measured using a wire screen diffusion battery system and size distribution of all airborne aerosols using a differential mobility particle sizer. The paper presents and discusses the results of activity size distribution and radon progeny concentration measurements for different environmental conditions. 7 refs., 2 tabs

  6. Interaction of radon progeny with atmospheric aerosols

    Energy Technology Data Exchange (ETDEWEB)

    Morawska, Lidia [Queensland Univ. of Technology, Brisbane, QLD (Australia). Centre for Medical and Health Physics

    1994-12-31

    The radiological health hazard due to the airborne radon progeny depends on three factors (i) radon concentration in the air, (ii) radon progeny concentration, and (iii) active particle size distribution. Conclusions as to the health hazard cannot be drawn without full understanding of the interaction mechanisms between radon progeny and atmospheric aerosols. The aim of this work was to study the interaction mechanisms between radon progeny, natural environmental aerosols and environmental tobacco smoke (ETS). The experiments were performed under controlled laboratory conditions of radon concentration (1.85 and 3.70 Bq m{sup -3}), relative humidity (35, 50, 75 and 95%) and ETS generation. The size distribution of radioactivity carrying aerosols was measured using a wire screen diffusion battery system and size distribution of all airborne aerosols using a differential mobility particle sizer. The paper presents and discusses the results of activity size distribution and radon progeny concentration measurements for different environmental conditions. 7 refs., 2 tabs.

  7. Modeling radon transport in multistory residential buildings

    International Nuclear Information System (INIS)

    Persily, A.K.

    1993-01-01

    Radon concentrations have been studied extensively in single-family residential buildings, but relatively little work has been done in large buildings, including multistory residential buildings. The phenomena of radon transport in multistory residential buildings is made more complicated by the multizone nature of the airflow system and the numerous interzone airflow paths that must be characterized in such a system. This paper presents the results of a computer simulation of airflow and radon transport in a twelve-story residential building. Interzone airflow rates and radon concentrations were predicted using the multizone airflow and contaminant dispersal program (CON-TAM88). Limited simulations were conducted to study the influence of two different radon source terms, indoor-outdoor temperature difference and exterior wall leakage values on radon transport and radon concentration distributions

  8. Radon survey in Metropolitan Toronto schools

    International Nuclear Information System (INIS)

    Becker, E.; Moridi, R.

    1992-01-01

    The radon testing survey in Metropolitan Toronto public schools was the most intensive project of its kind ever undertaken in Canadian schools. It also included an extensive public education program on radiation and radon-in-schools. The radon levels at 632 schools were measured using the CAIRS Radon Monitors. Ninety percent of the locations measured were found to have a radon level equal to or less than 2 mWL. Two locations in two different schools were found to have a radon level at or above the Action Level (20 mWL). The remaining results were between the two extremes. Follow-up testing in those schools where more than 10 mWL of radon was found is in progress. (author)

  9. Investigation of radon level in Chongqing

    International Nuclear Information System (INIS)

    Pan Chunzhen; Liu Jialie; Du Hengyan; Wang Ling; Li Yiwei

    2009-01-01

    Contents of radon in air in the urban district, building fields,diggings and hotel in Chongqing were investigated. Result shows that the mean concentration of radon is 10.8 Bq/m 3 in air in the urban district, and the mean concentration of radon is 1193 Bq/m 3 in soils on building fields. Radon level is obviously different in each of diggings, with the highest being in fluorite mine and the second in plumbum and zinc mine. The statistical mean value of radon concentration of 10 typles of diggings investigated is 65.2 Bq/m 3 , while the mean concentration of radon in fluorite mine is 369 Bq/m 3 , which is 35 times higher than in the urban area. The mean concentration of radon is 32.9 Bq/m 3 in eight hotels. (authors)

  10. Health Bridge - Les TIC au profit de la cueillette et de la gestion des ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    auparavant PATH Canada) s'emploie depuis 1982 à améliorer la santé des populations vulnérables. HealthBridge a du personnel au Canada, au Bangladesh, en Inde, en Tanzanie et au Vietnam et des projets de recherche en cours dans chacun ...

  11. Radon potential, geologic formations, and lung cancer risk

    Directory of Open Access Journals (Sweden)

    Ellen J. Hahn

    2015-01-01

    Conclusion: Radon potential maps that account for geologic factors and observed radon values may be superior to using observed radon values only. Knowing radon-prone areas could help target population-based lung cancer prevention interventions given the inequities that exist related to radon.

  12. Radon and buildings: Pt. 1

    International Nuclear Information System (INIS)

    1994-02-01

    An effective way of reducing the level of radon in dwellings is to extract air from beneath the ground floor. This is usually achieved by mechanical ventilation or by use of a radon sump. However, in some circumstances, these remedial measures may lower the air pressure inside the dwelling. In a small number of cases, this causes combustion gases from open-flued combustion appliances, such as open fires, to spill into the living spaces. Spillage of this type is potentially hazardous. This leaflet recommends ways to reduce the likelihood of spillage, and suggests solutions if spillage does occur. (author)

  13. New school radon abatement systems

    International Nuclear Information System (INIS)

    Simon, R.F.; Maniscalco, P.J.

    1990-01-01

    This paper describes the methods used to develop a state-of-the-art Radon Abatement system: all aspects of design and implementation from proper sizing radon ventilation ductwork (RVD) in relationship to the amount of free air available in sub-slab aggregate, review of electrical systems with their monitoring devices from the very basic to the more sophisticated type of installation, review abatement designs for their durability and application as well as methods and techniques. Building codes will also be reviewed for commercial construction applications, spot-lighting the usage of specific materials and techniques and their impact on the industry

  14. Study of the production of J/{psi} in Au-Au collisions at 200 GeV per nucleon pair in the PHENIX experiment; Etude de la production du J/{psi} dans les collisions or-or a 200 GeV par paire de nucleons dans l'experience PHENIX

    Energy Technology Data Exchange (ETDEWEB)

    Tram, V.N

    2006-01-15

    One of the most promising signature of Quark Gluon Plasma formation is the heavy quarkonium suppression due to color screening effect. First experiments at the SPS (CERN) have measured an 'anomalous suppression' of the J/{psi} yields (cc-bar state) in central Pb+Pb collisions. However, measurements at different collision energies and with different ions are mandatory to conclude about the discovery of a new state of nuclear matter. This thesis describes the J/{psi} production measured in the dimuon decay channel by the PHENIX experiment (RHIC) studying Au+Au collisions at 200 GeV in the center of mass. The J/{psi} yield measured in the most central collisions is suppressed by a factor of 3 as compared to the yield expected assuming binary scaling. Within the error bars, the suppression does not affect the J/{psi}'s rapidity distribution. However, a broadening of the transverse momentum distribution is observed as compared to the distribution measured in p+p collisions. In order to understand this suppression, 'cold nuclear effects', namely nuclear absorption and shadowing, are to be taken into account. These effects can describe neither the suppression amplitude nor the suppression pattern, suggesting that other mechanisms are involved. Predictions from different models which reproduce the suppression observed by NA50, can hardly describe the PHENIX measurements and over-estimate the suppression at RHIC. Comparisons with predictions from models including recombination of charm quarks give a reasonable description of the suppression amplitude as a function of centrality. However, these predictions are not in good agreement with the observed rapidity and transverse momentum distributions. Finally, one possible scenario is that the temperature at RHIC is not high enough to reach direct J/{psi} melting and that the measured suppression is due to the sequential disappearance from higher mass resonances ({chi}{sub c} and {psi}'). In this

  15. Radon in homes: The Alaskan experience

    International Nuclear Information System (INIS)

    Seifert, R.D.

    1990-01-01

    For the past four years, since radon was first found to be a concern in Alaska in 1986, the interest and awareness of radon as a special housing and health concern has continued to grow. This paper will discuss the features of a house in Alaska which would characterize it as at risk for radon, and also those efforts at mitigation which have been most effective in reducing radon under Alaskan conditions. Clearly radon must be able to enter a home in order to be a problem. Riefenstuhl and Kline (personal communication, 1988) have analyzed the conditions for radon transport from soils to home interiors very lucidly through the following scheme: four factors must exist in a house locale for it to be a radon at risk house. Two of the factors are geological in nature: (1) there must be adequate uranium and therefore ample radon to provide a source for transport; (2) there must be enough permeability in the soil to allow rapid soil gas movement to carry radon from its origin to the interior of the home within two half-lives of time (six days) or so. The other two factors are determined by the structure of the house itself and the way in which it is operated: (3) the house must have soil contact and imperfections, holes, cracks, intentional perforations which allow movement of soil gas with radon through the envelope of the basement or crawlspace; (4) there must be a lower pressure inside the house than in the soil so that soil gas flows into the house. All four of these characteristics are required to have radon be a problem. The absence of any single characteristic will eliminate radon (in general). This presents a series of options for mitigation of radon then, since elimination of any of the four characteristics will mitigate radon

  16. The use of soil gas as radon source in radon chambers

    Energy Technology Data Exchange (ETDEWEB)

    Al-Azmi, Darwish [Department of Applied Sciences, College of Technological Studies, Public Authority for Applied Education and Training, Shuwaikh, P. O. Box 42325, Code 70654 (Kuwait)], E-mail: ds.alazmi@paaet.edu.kw

    2009-03-15

    A procedure is described in which soil gas is utilized as an alternative to the {sup 226}Ra source for the supply of the radon gas required to fill a radon chamber where radon-measuring devices are calibrated. The procedure offers opportunities to vary the radon concentration within the chamber around an average value of about 500 Bq/m{sup 3}, which is considered to be sufficient for calibrating indoor radon detectors. The procedure is simple and the radon source does not require radiation protection certification (for import and/or use), unlike the commercially produced standard radioactive ({sup 226}Ra) sources.

  17. Geographical associations between radon and cancer: is domestic radon level a marker of socioeconomic status?

    International Nuclear Information System (INIS)

    Wolff, S.P.; Stern, G.

    1991-01-01

    Previous studies showing a geographical association between radon and various cancers, particularly the leukaemias and lymphomas, appear to be confounded by the role of radon levels as a surrogate for socioeconomic status. Higher socioeconomic status (at least at the UK county level) is correlated with higher levels of domestic radon. Controlling for the relationship between socioeconomic status and radon removes the correlation between radon exposure and lymphoproliferative disease. Reported associations between radon and lymphoproliferative disease (and possibly other cancers) may be secondary to socioeconomic variables. (author)

  18. A Radon Chamber without Radium Source for Detector Calibration and Radon Measurements

    International Nuclear Information System (INIS)

    Al-Azmi, D.; Karunakara, N.

    2008-01-01

    A radon chamber of volume 216 liters was designed and constructed for calibration of radon detectors and radon test measurements. The main feature of this chamber is that the active 226 Ra source, to generate the 222 Rn inside the chamber volume, is not required. Instead, 222 Rn from soil gas is utilized for this purpose. The supply of radon comes from the soil gas. Soil gas is drawn from the soil to fill the chamber with high radon concentration levels (∼ 80 kBq/m3). Desired radon concentration levels can be obtained by drawing the soil gas for different time durations and/or flow rate (author)

  19. The use of soil gas as radon source in radon chambers

    International Nuclear Information System (INIS)

    Al-Azmi, Darwish

    2009-01-01

    A procedure is described in which soil gas is utilized as an alternative to the 226 Ra source for the supply of the radon gas required to fill a radon chamber where radon-measuring devices are calibrated. The procedure offers opportunities to vary the radon concentration within the chamber around an average value of about 500 Bq/m 3 , which is considered to be sufficient for calibrating indoor radon detectors. The procedure is simple and the radon source does not require radiation protection certification (for import and/or use), unlike the commercially produced standard radioactive ( 226 Ra) sources.

  20. La notion de temporalité au cœur de l’analyse des discours représentés à l’oral : essai de typologie, procédés rhétoriques et portées argumentatives des DR dans le débat présidentiel français de 2007

    Directory of Open Access Journals (Sweden)

    Caillat Domitille

    2012-07-01

    Full Text Available Dans le cadre d’un débat, la représentation de propos peut être considérée comme une véritable « arme » rhétorique, tant le recours à ce procédé permet au locuteur de jouer de différentes retombées argumentatives. Aussi, à partir de la transcription de la rencontre entre Nicolas Sarkozy (NS et Ségolène Royal (SR lors du débat présidentiel de l’entre-deux tours de 2007, nous proposons-nous d’étudier les différentes formes de DR utilisées afin d’en dresser une typologie à visée argumentative. Pour ce faire, nous nous placerons dans une optique quelque peu divergente des classifications traditionnelles, puisque nous utiliserons la notion de « temporalité » — en tant que positionnement de l’énonciation de référence par rapport à l’intervention en cours — comme principal critère distinctif des occurrences et des effets dont celles-ci sont directement responsables. En plaçant de la sorte la temporalité au centre de l’étude des discours représentés (dorénavant DR, nous serons tout d’abord amenée à reconsidérer les critères traditionnellement pris en compte dans les classifications temporelles, avant de revenir sur l’importance de la nature des sources énonciatives de référence ; nous reviendrons en outre sur le critère de « virtualité » fréquemment utilisé comme un élément distinctif. Nous procéderons alors, dans le but d’expliquer au mieux la portée de chaque occurrence de DR, à un inventaire des diverses formes recensées, en conduisant pour chaque type de source énonciative une étude des différentes temporalités observables.

  1. 76 FR 72006 - Draft Interim Staff Guidance: Evaluations of Uranium Recovery Facility Surveys of Radon and Radon...

    Science.gov (United States)

    2011-11-21

    ... COMMISSION Draft Interim Staff Guidance: Evaluations of Uranium Recovery Facility Surveys of Radon and Radon... Recovery Facility Surveys of Radon and Radon Progeny in Air and Demonstrations of Compliance with 10 CFR 20... that existing guidance does not sufficiently detail how the NRC staff reviews surveys of radon and...

  2. Tensions, Réformes et Recherche du consensus: Vatican II dans l’itinéraire de l’Église catholique au XXe siècle - DOI: 10.5752/P.2175-5841.2011v9n24p963

    Directory of Open Access Journals (Sweden)

    Gilles Routhier

    2012-02-01

    Full Text Available Tensions, Réformes et Recherche du consensus: Vatican II dans l’itinéraire de l’Église catholique au XXe siècle(Tensions, reforms and consensus : Vatican II in the itinerary of the Catholic Church in the twentieth centuryRésumé Contrairement à ce que l’on affirme parfois, les tensions que l’on retrouve dans l’Église catholique au moment de la réception du concile ne sont pas nées avec le concile, mais s’enracinent au cours du siècle qui précéda Vatican II. Elles portent principalement sur le rapport de l’Église catholique au monde moderne. À Vatican II, si les Pères conciliaires ont été d’accord pour généraliser et accélérer l’effort de mise à jour de l’Église entamée depuis quelques décennies, quelques-uns ont refusé le discernement opéré par l’Église catholique sur l’enseignement des papes, depuis Pie IX, sur le rapport de l’Église avec le monde moderne. Les évêques appartenant à la majorité ont estimé qu’il fallait re-recevoir ces enseignements portés dans des circonstances historiques différentes, et les apprécier à la lumière des situations nouvelles dans lesquelles évoluait désormais l’Église catholique. L’opposition actuelle au concile refuse ce discernement et voudrait, par-delà le concile, revenir aux positions tenues au XIXe siècle. Mots-clés: Vatican II; L’Église Catholique. XXe siècle. Tensions. Réformes. Consensus Abstract To the contrary of what is commonly said, the tensions in the Catholic Church at the time of reception of the Council did not originate within the council, but are rooted in the course of the century prior to Vatican II. These tensions relate mainly to the relationship of the Catholic Church with the modern world. If the Fathers of the Second Vatican agreed to upgrade the Church, after a few decades some priests refused to follow the teachings of the Popes about the relationship of the Church with the modern world. Most bishops

  3. La grossesse extra-utérine dans une région semi-rurale en Afrique: Aspects épidémiologiques, cliniques et thérapeutiques à propos d'une série de 74 cas traités à l'Hôpital de District de Sangmelima au Sud-Cameroun

    Science.gov (United States)

    Kenfack, Bruno; Noubom, Michel; Bongoe, Adamo; Tsatedem, Faustin Atemkeng; Ngono, Modeste; Tsague, Georges Nguefack; Mboudou, Emile

    2012-01-01

    La grossesse extra-utérine (GEU) constitue une cause fréquente de morbidité et parfois de mortalité chez les femmes en âge de procréation. Son étiologie n'est pas clairement précisée. Son tableau clinique est polymorphe et ses méthodes thérapeutiques très diversifiées. C'est dans le but d’étudier les aspects épidémiologiques cliniques et thérapeutiques dans une zone rurale à ressources limitées d'Afrique que ce travail a été réalisé. Il s'agit d'une étude descriptive transversale sur une durée de trois ans, portant sur 74 cas de GEU traités à l'Hôpital de District de Sangmelima. Le matériel utilisé était constitué d'une fiche anonyme de collecte des données, des dossiers du malade, et du registre opératoire. Au cours de la période d’étude, 2142 naissances vivantes ont été enregistrées, soit un taux de GEU de 3,45%. Les femmes non mariées et celles ayant les antécédents d'IST étaient les plus atteintes. Le délai moyen entre le début des symptômes et l'admission était de132h. L’âge gestationnel moyen au moment du diagnostic était de 8,14 semaines. Le diagnostic était clinique dans 61% des cas. L'annexe controlatérale était cliniquement normale dans 53% des cas. Le traitement était chirurgical d'emblée chez 97% des cas. Aucun décès n'a été observé. La GEU est fréquente dans cette zone rurale, les malades consultent à un stade tardif, le diagnostic est surtout clinique, et le traitement chirurgical par laparotomie. PMID:23396682

  4. Local probability of indoor radon concentration to exceed the threshold estimated from geogenic radon potential

    Directory of Open Access Journals (Sweden)

    Bossew Peter

    2017-01-01

    Full Text Available Indoor radon has been recognized as an important air pollutant. Based on epidemiological evidence, it is estimated that indoor radon is the second cause of lung cancer after smoking. As a consequence, one tries to limit exposure through regulations concerning the remediation of the existing and prevention of future exposure. In this context, an essential task is the delineation of areas in which it can be expected with certain confidence that time-averaged indoor radon concentrations in dwellings and workplaces exceed the reference level. These are called radon priority areas to denote that these are areas in which remedial and preventive action has to be implemented with priority. There are different definitions of radon priority areas and different methods to estimate them from data. In Germany, the current approach uses the geogenic radon potential as the predictor. However, legal reference levels pertain to indoor radon concentration, not to the geogenic radon potential. One therefore has to identify derived reference levels for geogenic radon potential through statistical association of both quantities. This paper presents a method to derive the local probability that indoor radon concentration exceeds a threshold, given the local geogenic radon potential. The relationship can be used to derive geogenic radon potential reference levels which in turn serve to define radon priority areas.

  5. Residential radon in Galicia: a cross-sectional study in a radon-prone area.

    Science.gov (United States)

    Lorenzo-González, María; Ruano-Ravina, Alberto; Peón, Joaquín; Piñeiro, María; Barros-Dios, Juan Miguel

    2017-09-01

    Residential radon exposure is a major public health problem. It is the second greatest cause of lung cancer, after smoking, and the greatest in never-smokers. This study shows the indoor radon exposure distribution in Galicia and estimates the percentage of dwellings exceeding reference levels. It is based on 3245 residential radon measurements obtained from the Galician Radon Map project and from controls of two previous case-control studies on residential radon and lung cancer. Results show a high median residential radon concentration in Galicia (99 Bq m -3 ), with 49.3% of dwellings having a radon concentration above 100 Bq m -3 and 11.1% having a concentration above 300 Bq m -3 . Ourense and Pontevedra, located in South Galicia, are the provinces with the highest median indoor radon concentrations (137 Bq m -3 and 123.5 Bq m -3 , respectively). Results also show lower radon levels in progressively higher building storeys. These high residential radon concentrations confirm Galicia as a radon-prone area. A policy on radon should be developed and implemented in Galicia to minimize the residential radon exposure of the population.

  6. « Le roi “au cœur éveillé”. Images du désir et de la mort dans la littérature persane classique », in : François de Polignac éd. Alexandre le Grand, figure de l’incomplétude. Actes de la Table Ronde de la Fondation Hugot du Collège de

    OpenAIRE

    Fouchécour, Charles-Henri de

    2010-01-01

    L’article est une fine analyse du texte que Ferdowsī a consacré dans son Livre des Rois à Alexandre le Grand. L’auteur met à la disposition du thème proposé par l’ouvrage sa maîtrise dans la compréhension de la pensée de Ferdowsī. Le thème proposé était bien au cœur de celle-ci. L’inachèvement qui caractérise son personnage d’Alexandre est à la mesure de l’entreprise démesurée du héros. Inachèvement de l’identité, inachèvement psychologi­que, inachèvement, dans la mort, d’un projet d’immortal...

  7. Radon in the Helsinki metro

    International Nuclear Information System (INIS)

    Annanmaeki, M.; Oksanen, E.

    1992-01-01

    The metro line in Helsinki consists of a 4 km rock tunnel section as well as five underground stations in the city centre and a 12 km surface line with several bridges and seven surface stations outside the city centre. The excavation and the construction were started in 1971, and regular traffic began in 1982. The first measurements made during excavation in 1972 showed that radon concentration of 2000 Bq.m -3 might be reached, if the ventilation was not working properly. During the whole construction phase the highest radon concentration measured was about 7000 Bq.m -3 , but normally the concentrations were lower than 500 Bq.m -3 . After the traffic commenced, regular radon measurements were started at five underground stations, the train turning point and in the driver's cabin. In 1987 a continuous measurement procedure was adopted and measurements are now made four times a year, 2-7 days per place. The average radon concentration at the four underground stations was about 100 Bq.m -3 (the fifth station not in use). It has been estimated that the maximum effective dose for a worker is lower than 2 mSv.a -1 and the mean effective dose for a typical passenger is about 0.1 mSv.a -1 . (author)

  8. Inverting the Circular Radon Transform

    National Research Council Canada - National Science Library

    Redding, Nicholas

    2001-01-01

    ...) can be viewed as the inversion of the circular Radon transform. The advantage of viewing image formation in this way is that it could be used in situations where more standard methods could fail such as high squint and ultra-wideband SAR...

  9. Indoor radon in Tunisian spas

    International Nuclear Information System (INIS)

    Labidi, S.; Al-Azmi, Darwish; Ben Salah, R.

    2012-01-01

    Indoor radon concentrations were measured in four well-known spas of Tunisia using nuclear track detectors. The radon concentrations in these spas were found to be in the range of 19 - 870 Bq.m -3 . The equilibrium factor F between radon and its progeny was found to vary in the range of 0.2 - 0.5, depending upon the ventilation rates within the buildings of the spas. Using the exposure-dose conversion factor, the effective doses to patients and workers were estimated and the dose was found to vary in the range 3.7 x 10 -3 - 12.5 x 10 -3 mSv.y -1 and 0.45 - 1.5 mSv.y -1 for patients and workers, respectively. These values are well inside the limit recommended for the annual dose limit of 20 mSv.y -1 for an occupational worker. The radium content in the groundwater of all four spas was measured and the results showed no correlation between the 226 Ra concentration in water and radon concentration in indoor air of the investigated spas. (authors)

  10. Why measure radon decay products?

    International Nuclear Information System (INIS)

    Rolle, R.; Lettner, H.

    1997-01-01

    Combined development in spectrometry, instrumentation and ventilation modelling with its dependence on short- and long-term weather fluctuations renders possible a new, economical metrology for radon decay products. Short-term measurements can, with few restrictions, be converted to annual exposures of an accuracy superior to that from conventional medium-term Rn gas measurements. (orig.) [de

  11. Radon-222 measurements at Chester

    International Nuclear Information System (INIS)

    Fisenne, I.M.

    1982-01-01

    The Environmental Measurements Laboratory has compiled a five year record of continuous hourly radon-222 measurements at Chester, New Jersey. The data for the 1977-1978, 1978-1979, 1979-1980, and 1980-1981 have been reported previously

  12. Analyse experimentale des performances d'une batterie au lithium pour l'aeronautique

    Science.gov (United States)

    Bonnin, Romain

    Ce memoire a pour objectif d'identifier et d'etudier les performances necessaires pour qu'une batterie au lithium puisse etre utilisee dans le secteur de l'aeronautique. C'est pourquoi dans le cadre de notre recherche, nous allons proposer une procedure de tests permettant d'analyser et de determiner si la batterie au lithium peut etre implantee dans un avion. En vue de repondre a l'analyse des performances, une etude des fonctionnalites demandees par l'avion ainsi que des normes preexistantes vont etre effectuees. Suite a cette etape, nous allons elaborer un banc d'essais. Une fois le banc d'essais acheve, nous allons tester une batterie au lithium qui est supposee disposer de toutes les caracteristiques techniques requises pour etre implantee dans un avion. Ces tests nous permettront donc d'emettre un avis sur l'utilisation des batteries au lithium dans le domaine de l'aeronautique.

  13. Radon concentrations in Western Australian homes

    Energy Technology Data Exchange (ETDEWEB)

    Toussaint, L.F. [Health Dept. of Western Australia, Perth, WA (Australia). Radiation Health Branch

    1994-12-31

    Although there have been previous surveys of radon levels in some Western Australian homes, given the size of Western Australia (WA), it is desirable to carry out more measurements to better assess the likely radiation dose to the WA population. By monitoring a sufficient number of homes it will also be possible to identify any areas w here pockets of high radon concentrations exist in WA. An initial phase 1, radon survey, was carried out over the whole of the State. From the data gathered from phase 1 areas where higher radon levels might occur were identified. These areas of higher radon levels were investigated in phase 2 of the radon survey. Phase 2 involved dividing WA into 4 regions (based on electoral districts) and investigating radon levels in each region. For each region, approximately 500 homes were selected at random for radon monitoring. So far phase 1 has been completed and for phase 2 Regions 1 and 2 have been monitored. Data from phase 1 and Region 1 are presented. Initial data indicate a mean radon level of 15.7 Bqm{sup -3}, with 3 homes recording radon levels in excess of 100 Bqm{sup -3}. 11 refs., 1 tab., 2 figs.

  14. Radon and hydrotherapy: application to French spas

    International Nuclear Information System (INIS)

    Ameon, R.

    2004-01-01

    Owing to the use of thermal water for treatments, the dissolved radon ends up, through degassing, in the atmosphere of the various spa premises. According to the type of treatments, the radon activity concentration in the air is very variable; it depends on two factors, the supply of thermal water, and therefore of radon, and the ventilation of the various premises. In unfavourable, even non-existent, ventilation conditions, it is not uncommon to measure radon concentration reaching several thousands of becquerels per air cubic meter. These high values of radon activity concentration, with or without its short-lived daughters, may lead to a staff exposure of approximately ten or several tens of mSv per year. A French spa was subject to a radon 'expertise' during which the radon source terms, 'ground in contact with the buildings' and 'thermal water' were characterized. The radon mapping in the internal atmosphere of the various spa premises and the workstations' analysis resulted in an assessment of the exposure due to radon inhalation. This study showed that on workstations, notably linked to hydrotherapy, the staff exposure to radon is in the same range as the dose assessments from foreign studies. The implementation of an appropriate ventilation of the treatment rooms and a better management of the thermal water in the spa resulted in a significant reduction of staff exposure

  15. Outdoor radon variation in Romania

    International Nuclear Information System (INIS)

    Simion, Elena; Simion, Florin

    2008-01-01

    Full text: The results of a long-term survey (1992 - 2006) of the variations of outdoor radon concentrations in semi-natural location from Romania are reported in the present paper. Measurements, covering between two and four sessions of the day (morning, afternoon, evening and night), were performed on a daily bases by 37 Environmental Radioactivity Monitoring Stations from National Environmental Radioactivity Survey Network. The method used was based on indirect determination of outdoor radon from aerosol samples collected on glass micro-fibre filters by drawing the air through the filters. The sampling was performed in a fixed place at a height of 2 m above the ground surface. Total beta counting of aerosol samples collected was performed immediately and after 20 hours. Values recorded during the years of continuous measurement indicated the presence of several patterns in the long-term variation of outdoor radon concentration: diurnal, seasonal and annual variation. For diurnal variation, outdoor radon concentration shows a maximum values in the night (early hours) and minimum values by day (in the afternoon). On average, this maximum is a factor of 2 higher than the minimum. Late autumn - beginning of winter maximum and an early spring minimum are characteristic for seasonal patterns. In the long term a seasonal pattern was observed for diurnal variation, with an average diurnal maximum to minimum ratio of 1.33 in winter compared with 3.0 in the summer months. The variations of outdoor radon levels showed little correlation with the uranium concentration of the ground and were attributed to changes in soil moisture content. In dry seasons, because of the low precipitation, the soil was drying out in the summer allowing fractures to develop and radon to migrate easily through the ground. Depending on micro-climatic and geological conditions, outdoor radon average concentrations in different regions of Romania are from 1200 mBq/mc to 13065 mBq/mc. The smallest

  16. Les modalités épistémique et déontique dans les énoncés au futur (simple et composé)

    DEFF Research Database (Denmark)

    Stage, Lilian

    2002-01-01

    saisir le sens du futur, il est important de connaître les règles pragmatiques qui lui permettent de véhiculer les valeurs épistémique et déontique. Dans cet article, les contextes modalisants sont examinés à la loupe et les énoncés modaux sont également étudiés dans une optique contrastive (français...

  17. 9th Saxonian radon day. 11th meeting on radon safe structural engineering; 9. Saechsischer Radontag. 11. Tagung radonsicheres Bauen

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2015-07-01

    The proceedings of the meeting in radon-safe structural engineering covers contributions on the following issues: implementation of the EU standards, radon protection in underground cavities, radon protection at working places, reports on experiences.

  18. Second workshop on radon and radon daughters in urban communities associated with uranium mining and processing

    International Nuclear Information System (INIS)

    1979-01-01

    A second meeting of Atomic Energy Control Board staff, federal and provincial government representatives, and consultants was held to discuss progress in reducing the concentrations of radon and its daughter products in houses in communities like Bancroft, Elliot Lake, Port Hope, and Uranium City. Participants discussed successful and unsuccessful remedial techniques, possible sources of radon, and methods of measuring radon and radon daughters in buildings

  19. Application of sensitive and supersensitive radon detectors for radon flux density and radon concentration in environmental monitoring

    International Nuclear Information System (INIS)

    Zahorowski, W.; Whittlestone, S.

    1997-01-01

    The paper presents a review of principles and operational parameters of the latest instrumental development in sensitive and high sensitive radon detectors at Australian Nuclear Science and Technology Organisation (ANSTO). The focus is on advances in measurement technology of radon concentration in air and radon flux density. Two areas in which ANSTO is actively involved are discussed. The first area concerns radon in air monitoring at Cape Grim Baseline Air Pollution Station. Results recorded at the Station with a supersensitive radon detector characterised by lower limit of detection down to few mBq m -3 with time resolution better than 90 minutes are presented to illustrate importance of the technique in global monitoring of airborne pollution. The second area concerns estimates of radon and thoron fluxes from large geographical areas. This is illustrated by results obtained during an Australia-wide survey of radon fluxes and from thoron flux measurements around the Mauna Loa Observatory in Hawaii. The radon flux estimates from Australia come from a coarse net of spot measurements combined with data from aerial gamma surveys. It is argued that as radon global flux and air concentration estimates improve, the data will provide progressively more stringent tests of global air transport models. (author)

  20. Search for radon sources in buildings--kindergartens.

    Science.gov (United States)

    Vaupotic, J

    2002-01-01

    In ten high radon level kindergartens, radon sources were sought by applying a combination of several radon measuring techniques: etched track detectors to obtain average indoor air radon concentration, continuous devices to record radon concentration and see its diurnal variation, and alpha scintillation cells to determine radon concentration in the air entering a room from cracks, holes and sinks in the floor and from under-floor channels. In three cases, a strong local radon source was identified while, in the others, the bad quality of the basic concrete slab was responsible for the high indoor radon concentration.

  1. Radon and its daughters in vivo

    International Nuclear Information System (INIS)

    Rundo, J.

    1983-01-01

    Some aspects of the behavior of radon and its short-lived daughters in vivo are described and a relationship between the radon exhalation rate and time after a meal is demonstrated. A major but short-lived postprandial increase in the exhalation rate of radon produced from skeletally-deposited radium was observed and a similar effect in exhalation rate of environmental radon by persons containing no radium was noted. Persons living in houses with elevated concentrations of radon may contain sufficient activity for its detection by external gamma-ray counting. Some of the activity observed is due to inhaled daughter-products in the chest, and some to daughter-products associated with and produced by the decay of radon throughout the body. 3 references, 8 figures. (MF)

  2. Radon in water aeration system operational performance

    International Nuclear Information System (INIS)

    Lamarre, B.L.

    1990-01-01

    North East Environmental Products, Inc. is a manufacturer of residential scale aeration systems for removal of radon and volatile organic chemicals from private water supplies. This paper is a review of the operational history of residential scale point of entry (POE) radon aeration systems. Emphasis is placed on the difficulties and solutions encountered in actual installations caused by both mechanical difficulties and water quality parameters. A summary of radon reduction efficiency is presented for wells with radon concentrations from 21,000 to 2,600,000 pCi/L. A discussion of customer concerns and attitudes is presented along with other areas for further technical improvement. Training techniques for dealers and installers are also discussed. An update of the current status of the radon in water industry includes current sales volumes as compared to the potential market and an update on the radon in water MCL standard setting process from an industry perspective

  3. The radon: evaluation and risk management; Le radon: evaluation et gestion du risque

    Energy Technology Data Exchange (ETDEWEB)

    Lacoste, A.C. [Direction Generale de la Surete Nucleaire et de la Radioprotection, 75 - Paris (France); Masse, R. [Academie des Technologies, 75 - Paris (France); Aurengo, A. [Hopital Pitie-Salpetriere, Service de Medecine Nucleaire, 75 - Paris (France); Erich Wichmann, H. [Neuberberg Munich Univ. (Germany); Timarche, M.; Laurier, D.; Robe, M.Ch. [Institut de Radioprotection et de Surete Nucleaire (IRSN), 92 - Clamart (France); Baubron, J.C.; Bonijoly, D. [BRGM, 75 - Paris (France); Collignan, B. [Centre Scientifique et Technique du Batiment, (CSTB), 75 - Paris (France); Berrier, H. [Direction Gle de l' Urbanisme de l' Habitat et de la Construction, 75 - Paris (France); Jaouen, J. [Direction Departementale des Affaires Sanitaires et Sociales de la Haute-Vienne (France); Caamano, D. [Direction Departementale des Affaires Sanitaires et Sociales de l' Essonne, 91 (France); Guiot, F. [Direction Departementale des Affaires Sanitaires et Sociales de la Haute-Marne (France); Grall, B. [Direction Departementale des Affaires Sanitaires et Sociales de Bretagne (France); Frutos Vasquez, B.; Olaya Adan, M. [Istituto de Ciencias de la Construction (Italy); Garcia Cadierno, J.P.; Martin Matarranz, J.L.; Serrano Renedo, J.; Suarez Mahou, E. [Consejo de Seguridad Nuclear, Madrid (Spain); Fernandez, J.A. [ENUSA Industrias Avanzadas (Spain); Mjones, L.; Pirard, P. [Institut de veille sanitaire, 94415 - Saint-Maurice (France); Godet, J.L.; Rougy, Ch. [Direction Gle de la Surete Nucleaire et de la Radioprotection, 75 - Paris (France)

    2003-06-15

    The radon exposure constitutes for the French population the first cause of natural irradiation among the different natural sources of irradiation. It is possible to have a significant action on it, either by making draught proof in order to avoid to radon to get inside houses, either by ventilating in order to dispel the radon and improve air quality. (N.C.)

  4. Workshop on radon and radon daughters in urban communities associated with uranium mining and processing

    International Nuclear Information System (INIS)

    1978-01-01

    This meeting of Atomic Energy Control Board staff, representatives of other government departments, and consultants was called to exchange information on steps taken to lower radiation levels in houses in communities such as Elliot Lake, Uranium City, and Port Hope. Discussions covered the sources of radon and radon daughters in these houses, radon measurement techniques, and remedial methods that worked or were not successful

  5. Radon reduction and radon-resistant construction demonstrations in New York state. Final report

    International Nuclear Information System (INIS)

    1991-02-01

    A survey of radon levels in New York State homes indicates that approximately 4.4 percent of the homes have long-term living area radon concentrations above the U.S. EPA guideline of four pCi/l. The project addressed the effectiveness of techniques to reduce the radon level in existing homes and to prevent the occurrence of high radon concentrations in new homes. The goal of the project was to demonstrate the effectiveness of radon reduction techniques in homes containing indoor radon concentrations of more than the current EPA guidelines of four pCi/l. At the same time, radon-resistant construction techniques were demonstrated in homes under construction to provide guidelines for houses being built in areas with a danger of high radon levels. The project demonstrated new radon mitigation techniques in homes containing indoor radon concentrations exceeding four pCi/l; assessed the value of previously installed radon reduction procedures, and demonstrated new radon-resistant construction methods

  6. Comparison of two numerical modelling approaches to a field experiment of unsaturated radon transport in a covered uranium mill tailings soil (Lavaugrasse, France).

    Science.gov (United States)

    Saâdi, Zakaria; Guillevic, Jérôme

    2016-01-01

    Uncertainties on the mathematical modelling of radon ((222)Rn) transport in an unsaturated covered uranium mill tailings (UMT) soil at field scale can have a great impact on the estimation of the average measured radon exhalation rate to the atmosphere at the landfill cover. These uncertainties are usually attributed to the numerical errors from numerical schemes dealing with soil layering, and to inadequate modelling of physical processes at the soil/plant/atmosphere interface and of the soil hydraulic and transport properties, as well as their parameterization. In this work, we demonstrate how to quantify these uncertainties by comparing simulation results from two different numerical models to experimental data of radon exhalation rate and activity concentration in the soil-gas measured in a covered UMT-soil near the landfill site Lavaugrasse (France). The first approach is based on the finite volume compositional (i.e., water, radon, air) transport model TOUGH2/EOS7Rn (Transport Of Unsaturated Groundwater and Heat version 2/Equation Of State 7 for Radon; Saâdi et al., 2014), while the second one is based on the finite difference one-component (i.e., radon) transport model TRACI (Transport de RAdon dans la Couche Insaturée; Ferry et al., 2001). Transient simulations during six months of variable rainfall and atmospheric air pressure showed that the model TRACI usually overestimates both measured radon exhalation rate and concentration. However, setting effective unsaturated pore diffusivities of water, radon and air components in soil-liquid and gas to their physical values in the model EOS7Rn, allowed us to enhance significantly the modelling of these experimental data. Since soil evaporation has been neglected, none of these two models was able to simulate the high radon peaks observed during the dry periods of summer. However, on average, the radon exhalation rate calculated by EOS7Rn was 34% less than that was calculated by TRACI, and much closer to the

  7. Time variations of the ultra thin Po 218 and Pb 214 size distribution, of the free fraction and of the equilibrium factor of the short-lived derivatives from the radon 222, in a house; Etude des variations temporelles de la distribution en taille du Po-218 et du Pb-214 ultrafins, de la fraction libre et du facteur d'equilibre des derives a vie courte du Radon-222 dans une habitation

    Energy Technology Data Exchange (ETDEWEB)

    Huet, C.; Tymen, G. [Lab. de Recherches Appliquees Atmosphere, Hydrosphere, Faculte des Sciences et Techniques, 29 - Brest (France); Boulaud, D. [Paris-12 Univ., Lab. de Physique des Aerosols et de Transfert des Contaminations, 94 - Creteil (France)

    2000-07-01

    The radon 222 is a radioactive natural gas coming from the uranium 238 channel. It is present in soils and building materials. After exhalation it produces derivatives such as Po 218, Pb 214, Bi 214 and Po 214. These solid particles may stick to the aerosols of the ambient air and be inhaled by the human. To determine the possible effects on health, aerosols monitoring, and more specifically, size distribution of Po 218 and Pb 214, has been realized in a house of Brittany during one year. The experiment equipment and the results are presented. (A.L.B.)

  8. A perspective on risks from radon

    Energy Technology Data Exchange (ETDEWEB)

    Higson, D. J., E-mail: higsond@bigpond.net.a [Australasian Radiation Protection Society, PO Box 7108, Upper Ferntree Gully, Victoria 3156 (Australia)

    2010-10-15

    In its Statement on Radon (November 2009), the International Commission on Radiological Protection (ICRP) has reduced the upper reference level for radon gas in dwellings to 300 Bq m{sup -3}. The recommended level for workplaces is 1000 Bq m{sup -3}. A risk coefficient of 8 x 10{sup -10} per Bq h m{sup -3} is recommended without reference to smoking habits. On the basis of these figures: 1) The estimated risk of fatal cancer from exposure to radon at home and at work could be greater than the observed risk of accidental death from travelling by car, which would be surprising if true. 2) The estimated risk of lung cancer from radon could be greater than the observed risk of lung cancer from all causes, which is actually known to be dominated by smoking. The author is not aware of any direct evidence of risks from inhaling radon in Australian dwellings, 99% of which have radon levels below 50 Bq m{sup -3}. Evidence available from other countries shows that: 1) The effects of radon in the incidences of lung cancer are uncertain at levels less then about 50-100 Bq m{sup -3}. 2) The estimation of risks at levels below 200 Bq m{sup -3} depends on extrapolation from risks observed at higher levels. 3) Risks to non-smokers from radon are 25 times less than risks to smokers. Its concluded that the ICRP Statement on Radon and radon policies in the US and UK have the potential to cause unwarranted concern. Some people may be made to feel they need to spend money modifying their homes and workplaces to protect occupants from exposure to radon when there is no compelling reason to show that this is necessary. The vast majority of non-smokers do not need to be protected from radon. (Author)

  9. Operating instructions for LBL radon measurement facilities

    International Nuclear Information System (INIS)

    Ingersoll, J.G.

    1980-06-01

    This manual is intended for users of the radon-measuring facilities of the Radon Project of the Building Ventilation and Indoor Air Quality Program at Lawrence Berkeley Laboratory. The manual comprises three parts. Part 1 sets out the steps involved in collecting, transferring, and counting radon. Part 2 describes the calibration of the transfer system and of the Lucas cells in the counting system. Part 3 outlines the maintenance procedures for the facility

  10. The radon influence of SAGE results

    CERN Document Server

    Gavrin, V N; Mirmov, I N

    2002-01-01

    The method for evaluating systematic errors, connected with radon, is described in the experiment on determining the SAGE solar neutrino flux. The systematic error by the measured neutrino capture rate in the gallium 75 SNU target does not exceed 0.3 SNU. The obtained value (0.3 SNU) is the upper limit of the radon systematic error. Its low value means, that radon does not contribute significantly to the SAGE result

  11. A Fuzzy Radon Transform for Track Recognition

    CERN Document Server

    De Laat, C T A M; CERN. Geneva; Lourens, W; Kamermans, R

    1993-01-01

    In this contribution a fuzzy Radon transform is shown for application in ALICE and ATLAS (typical track density of 8000 in one unit of rapidity). Resolution is introduced by the "broadening" of the matching tracks in the Radon transform, which is obtained by making a convolution of the matching tracks with Gaussian kernel. In a good approximation, an analytical expression for the fuzzy Radon transform is given. An example of two track separation with noisy input is added.

  12. Radon in the Hotels in Montenegro

    International Nuclear Information System (INIS)

    Vukotic, P.; Antovic, N.; Dapcevic, S.; Uvarov, V.V.; Mrdak, R.

    1997-01-01

    Indoor radon concentrations in the 16 hotels in Montenegro, well known by tourists, were measured in winter period by an integral method, with etch-track detectors. Radon concentrations obtained at the 30 measuring sites are in a range (22 - 90) Bq/m 3 , with an arithmetic mean of 43 Bq/m 3 . This means that the radon levels in the all surveyed hotels in Montenegro are much bellow the most stringent reference level internationally recommended. (author)

  13. Contribution of radon in tap water to indoor radon concentrations

    International Nuclear Information System (INIS)

    Gesell, T.F.; Prichard, H.M.

    1980-01-01

    The contribution of radon ( 222 Rn) in domestic water supplies to the concentration of 222 Rn in indoor atmospheres has been investigated and found to be significant for concentrations over a few thousand picocuries per liter in the water supply. A model predicting average indoor increments due to this source is presented and supported by a series of measurements made in the laboratory and in private homes in the vicinity of Houston, Texas. The efficiency with which radon is transferred from water to air was experimentally determined, and these efficiencies were combined with estimates of average indoor water use to produce a source term proportional to the concentration of 222 Rn in the tap water. The importance of the dwelling volume and the air change rate is discussed

  14. Technique and equipment for measuring volume activity of radon in the air of radon laboratories and clinics

    International Nuclear Information System (INIS)

    Vorob'ev, I.B.; Krivokhatskij, A.S.; Nekrasov, E.V.; Nikolaev, V.A.; Potapov, V.G.; Terent'ev, M.V.

    1990-01-01

    Usability of a new equipment-technique combination for measuring radon activity in the air of radon laboratories and balneological clinics is studied. The complex includes nitrate-cellulose detector, radon chamber, Aist, Istra type spark counters and technique of spark counting. The method sensitivity is 50 Bqxm 3 , the error is 30%. Usability and advisability of track method in radon laboratories and balneological clinics for simultaneous measurement in several points of integral volumetric radon activities are confirmred. The method permits to carry out rapid and accurate bulk investigations. The results of determining mean volumetric radon activity in the air in different points of radon laboratory and radon clinics are presented

  15. Radon epidemiology: A guide to the literature

    International Nuclear Information System (INIS)

    Marks, S.

    1988-12-01

    This document was written as a comprehensive overview of the voluminous literature on both uranium miner and residential radon epidemiology studies. This document provides the reader with a fairly complete list of radon epidemiology publications and key features of each, so that readers may further pursue only those publications of interest in the vast body of radon literature. A companion document, exploring all on-going residential radon epidemiology studies will be published by the Office of Health and Environmental Research (OHER), the Department of Energy (DOE) in the spring of 1989

  16. Czech studies of lung cancer and radon

    International Nuclear Information System (INIS)

    Tomasek, L.

    2002-01-01

    According to the International Agency for Research on Cancer, there is a significant evidence to classify radon as a carcinogen. Using extrapolations from occupational studies, it can be shown that for some countries environmental exposure to radon is the second most important cause of lung cancer in the general population after cigarette smoking. Czech studies among uranium miners, established in 1970 by Josef Sevc, and in the general population aim to contribute to knowledge on the risk from radon, particularly by evaluating temporal factors and interaction of radon exposure and smoking

  17. Behaviors of radon in indoor environment

    International Nuclear Information System (INIS)

    Mochizuki, Sadamu; Shimo, Michikuni.

    1987-01-01

    The source of radon ( 222 Rn) in the atmosphere is radioactive nuclide, uranium ( 238 U), which exists fairly common throughout the earth's crust. Radium ( 226 Ra) descended from uranium produce radon ( 222 Rn) of noble gas by decay. After formation in the ground, radon diffuses into the atmosphere. Without exception radon decay products are heavy metals which soon become attached to natural aerosols. Therefore, radon and its daughters (decay products) appear also in indoor environment, and generally, their concentration levels become higher than that of outdoor air due to build-up effects in the closed indoor environments. With the progress of the study on the influence of radon and its daughers on human health, it has become clear that they act effectively as an exciting cause of lung cancer. So, the study on the risk evaluation of them in room air has become to be very important. Concequently, the behaviors of radon and its daughters in indoor environment, first of all, should be studied in detail for the accurate estimation of the risk caused by them. In this special edition, fundamental characteristics of radon and its daughters, some measuring methods, theoretical considerations and some observational evidences obtained from various circumstances of indoor environment are described inorder to grasp and understand the behaviors of radon and its daughters in the indoor environment. (author)

  18. Low-Cost Radon Reduction Pilot Study

    Energy Technology Data Exchange (ETDEWEB)

    Rose, William B. [Partnership for Advanced Residential Retrofit, Champaign, IL (United States); Francisco, Paul W. [Partnership for Advanced Residential Retrofit, Champaign, IL (United States); Merrin, Zachary [Partnership for Advanced Residential Retrofit, Champaign, IL (United States)

    2015-09-01

    The aim of the research was to conduct a primary scoping study on the impact of air sealing between the foundation and the living space on radon transport reduction across the foundation-living space floor assembly. Fifteen homes in the Champaign, Illinois area participated in the study. These homes were instrumented for hourly continuous radon measurements and simultaneous temperature and humidity the foundation was improved. However, this improved isolation did not lead to significant reductions in radon concentration in the living space. Other factors such as outdoor temperature were shown to have an impact on radon concentration.

  19. Radon in the Environment: Friend or Foe?

    International Nuclear Information System (INIS)

    Hussein, A.S.

    2009-01-01

    Radon 222 is a naturally occurring radioactive gas that is part of the Uranium decay series. Its Presence in the environment is associated mainly with trace amounts of uranium and its immediate parent, radium 226 , in rocks, soil and groundwater. About one-half of the effective doses from natural sources is estimated to be delivered by inhalation of the short lived radon progeny. Owing to this fact, radon is the most popular subject of studies on environmental radioactivity. The presence of high level of radon in indoor environment constitutes a major health hazard for man. The radon progeny is well established as causative agents of lung cancer and other types of caners. Radon unique properties as a naturally radioactive gas have led to its use as a geophysical tracer for locating buried faults and geological structures, in exploring for uranium, and for predicting earthquakes. Radon has been used as a tracer in the study of atmospheric transport process. There have been several other applications of radon in meteorology, water research and medicine. This paper summarizes the health effects and the potential benefits of radon and its progeny.

  20. Radon investigations - Soil and commercial projects

    International Nuclear Information System (INIS)

    Goodwin, R.W.

    1987-01-01

    The liability issues of radon exposure have prompted potential purchasers of vacant land for commercial/industrial development, and commercial landlords, renting large commercial buildings, to determine the radon gas levels at such sites. This paper deals with both pre-construction sites subject to freezing conditions and to large commercial structures. A correlation of radon gas levels within a commercial building and a sister pre-construction site confirms the validity of using activated charcoal canisters as a cost effective means to combating radon in large structures

  1. Radon and radon daughters in mine atmospheres and influencing factors

    International Nuclear Information System (INIS)

    Berteig, L.; Stranden, E.

    1981-01-01

    The measurement of the total activity of radon daughters in the air of mines has become a routine procedure in order to control the radiation exposure in miners due to the inhalation of these radionuclides. Normally the measured concentration is given in terms of total potential α-energy of the short lived radon daughters. In addition, the degree of equilibrium between the daughter products in air and the fraction of daughter products not attached to aerosol particles (the unattached fraction) must be known. The concentrations of radon and daughter products may vary considerably during the day. Seasonal variations are also frequently found. It is therefore important to have knowledge of the magnitude of these variations and of the factors having the strongest influence upon the concentrations. In this paper the main results of a study on the radiological characteristics of non-uranium mines are summarized. The correlations between the unattached fraction of the potential α-energy and the unattached fraction of the individual daughters, and between the equilibrium factor F, and the individual daughter ratios are discussed

  2. Modeling of indoor radon concentration from radon exhalation rates of building materials and validation through measurements

    International Nuclear Information System (INIS)

    Kumar, Amit; Chauhan, R.P.; Joshi, Manish; Sahoo, B.K.

    2014-01-01

    Building materials are the second major source of indoor radon after soil. The contribution of building materials towards indoor radon depends upon the radium content and exhalation rates and can be used as a primary index for radon levels in the dwellings. The radon flux data from the building materials was used for calculation of the indoor radon concentrations and doses by many researchers using one and two dimensional model suggested by various researchers. In addition to radium content, the radon wall flux from a surface strongly depends upon the radon diffusion length (L) and thickness of the wall (2d). In the present work the indoor radon concentrations from the measured radon exhalation rate of building materials calculated using different models available in literature and validation of models was made through measurement. The variation in the predicted radon flux from different models was compared with d/L value for wall and roofs of different dwellings. The results showed that the radon concentrations predicted by models agree with experimental value. The applicability of different model with d/L ratio was discussed. The work aims to select a more appropriate and general model among available models in literature for the prediction of indoor radon. -- Highlights: • The measurement of indoor radon concentration was carried out by pin hole based dosimeter. • The indoor radon concentration was calculated from different model available in the literature. • A comparison of wall flux from two different approaches was carried out for different d/L ratio. • A more appropriate model for prediction of indoor radon concentration was validated

  3. Radon in dwellings in Finland; Asuntojen radonpitoisuus Suomessa

    Energy Technology Data Exchange (ETDEWEB)

    Voutilainen, A.; Maekelaeinen, I.; Reisbacka, H.; Castren, O.

    1997-10-01

    For over ten years STUK (The Radiation and Nuclear Safety Authority) has performed systematic indoor radon mapping in Finland with health authorities in municipalities. The most efficient means of reducing indoor radon exposure is to locate and mitigate dwellings with radon concentration exceeding the action level of 400 Bq/m{sup 3} and to build new houses so that radon concentrations do not exceed 200 Bq/m{sup 3}. Therefore STUK has made radon measurement plans and radon risk maps to identify radon-prone areas. During 1986 - 1996 the municipalities have ordered 33 000 dosemeters for radon measurements. Private persons have ordered 24 000 dosemeters and STUK has used for its own investigations 34 000 dosemeters. Today the basic radon database of STUK consists information of about 52 000 Finnish dwellings. This report is a summary of the radon measurements made by STUK in low-rise dwellings. The radon situation by provinces is presented in tables.

  4. The measure and control system of mini-type radon room based on PC104

    International Nuclear Information System (INIS)

    Zhou Shumin; East China Inst. of Technology, Fuzhou; Tang Bin; Sun Yamin

    2005-01-01

    Radon room is one of the standard equipment which demarcates radon measure instrument. The paper discusses the dynamic method and mathematic model which keeps the radon consistence stability in radon room. The system is developed on PC104. The system can monitor the radon consistence and replenishment radon according the radon control parameter. (authors)

  5. Integral measurement system for radon

    International Nuclear Information System (INIS)

    Garcia H, J.M.; Pena E, R.

    1996-01-01

    The Integral measurement system for Radon is an equipment to detect, counting and storage data of alpha particles produced by Radon 222 which is emanated through the terrestrial peel surface. This equipment was designed in the Special Designs Department of the National Institute of Nuclear Research. It supplies information about the behavior at long time (41 days) on each type of alpha radiation that is present into the environment as well as into the terrestrial peel. The program is formed by an User program, where it is possible to determine the operation parameters of a portable probe that contains, a semiconductor detector, a microprocessor as a control central unit, a real time clock and calendar to determine the occurred events chronology, a non-volatile memory device for storage the acquired data and an interface to establish the serial communications with other personal computers. (Author)

  6. Radon in dwellings in Sweden

    International Nuclear Information System (INIS)

    Swedjemark, G.A.

    1980-01-01

    Studies on specific activities in building materials, gamma-radiation levels in dwellings, the concentrations of radon and daughters in the air indoors and the concentration of radon in tap water are in progress in Sweden. On the basis of these investigations and of the investigation of Hultqvist from the beginning of the 1950's, an attempt has been made to show how the radiation doses in dwellings have changed or may be changed by human activities and what these changes imply in terms of collective dose. The annual collective absorbed dose in the basal cells of the critical bronchial region have increased from 11 x 10 3 man-Gy for the occupants of dwellings existing in 1950 to 25 x 10 3 man-Gy for dwellings existing in 1975

  7. Radon: a problem of terminology

    International Nuclear Information System (INIS)

    Pellegrini, D.; Demongeot, S.

    1995-01-01

    Here are detailed the difficulties to speak about the same thing if we don't use the same language. The example is the radon and what we want to tell about it; it is necessary to explain what words we are using and what mean we want to give them. Then, emanation and exhalation are given with their definitions. Also the terms as factor, flux and rate are redefined. It is a way to make scientific population sensitive to terminology

  8. Radon risk in ore miners

    International Nuclear Information System (INIS)

    Beno, M.

    1997-01-01

    Underground workers are exposed to various clastogenic agents. One of these agents, radon, attracts attention of recent research as it causes lung cancer in the population occupationally exposed to its various concentrations especially in mine air of uranium mines or ore mines. This paper is a pilot study in which the numbers of chromosomal aberrations (CA) in lymphocytes of ore mines (Nizna Slana-iron ore, Hnusta-talc ore) located in east central Slovakia were followed and related to the lifetime underground radon exposure and to lifetime smoking. Seventy miners volunteering after an informed consent served as donors of venous blood. Twenty healthy pro-bands, age matched with the miners, which never worked underground (mostly clerks) served as donors of control blood samples. The exposure to radon and smoking has been estimated according to working-records and personal anamnesis. The findings unequivocally showed a small but statistically significant clastogenic effect of the exposure to underground environment of the mines concerned. This study has shown also a small but significant influence of smoking, which in the subgroup of miners working underground less than 1500 shifts may have acted synergically with the underground exposure. It was concluded tat: (1) Significantly higher counts of chromosomal aberrations in lymphocytes of 70 miners than in an age matched control group of 20 white-collar workers were found; (2) The higher counts of chromosomal aberrations could be ascribed to underground exposure of miners and to smoking; (3) The positive dependence of the number of chromosomal aberrations from the exposure to smoking was loose and it was expressed by significantly higher chromosomal aberrations counts in the group of miners working less than 1500 shifts underground; (4) A dependence of chromosomal aberrations counts from the exposure to radon could not be assessed. At relatively low numbers of pro-bands in subgroups it was not ruled out the confounding

  9. Evaluation of the uniformity of concentration of radon in a radon chamber

    International Nuclear Information System (INIS)

    Xiongjie, Zhang; Ye, Zhang; Yang, Liu; Bin, Tang

    2016-01-01

    In order to solve the problem that the evaluation results of the uniformity of concentration of radon in a radon chamber via various methods were difficult to compare, according to its statistical properties, a mathematical model was built to analyze the uniformity of concentration of radon; an evaluation method for the overall uniformity of concentration of radon was proposed on the basis of single-factor multi-group ANOVA, and a detection method for nonuniform points in a radon chamber was proposed on the basis of single-factor two-group t-test; an evaluation process of the uniformity of concentration of radon in a radon chamber was established. The proposed method was applied to evaluate the HD-6 small and medium-sized radon chambers and achieved good results. - Highlights: • The mathematical model was built to analyze the uniformity of concentration of radon. • An evaluation method was proposed to evaluate the uniformity of radon concentration. • The method was successfully used in evaluating the uniformity in a radon chamber.

  10. Radon and radon daughter measurements at and near the former Middlesex Sampling Plant, Middlesex, New Jersey

    International Nuclear Information System (INIS)

    Haywood, F.F.; Perdue, P.T.; Christian, D.J.; Leggett, R.W.; Dickson, H.W.; Myrick, T.E.

    1980-03-01

    The results of the radon and radon daughter measurements made to date (1978) at the Middlesex Sampling Plant in Middlesex, New Jersey, are presented in this report. These measurements were one portion of a more comprehensive radiological survey conducted at this site and the surrounding area from 1976 to 1978. The surveyed property served as a uranium ore sampling plant during the 1940's and early 1950's and as a result contains elevated levels of surface an subsurface contamination. On-site indoor radon daughter and radon concentrations exceeded both the US Surgeon General Guidelines and the Nuclear Regulatory Commission's maximum permissible concentration limits for radon (10 CFR Part 20) in all structures surveyed. Off-site structures showed concentrations of radon and radon daughters at or only slightly above background levels, except for one site where the radon levels were found to be above the 10 CFR Part 20 guidelines. Outdoor radon ad radon daughter concentrations, measured both on and off the site, were well below the guidelines, and the data give no indication of significant radon transport from the site

  11. Géochimie des Terres Rares et des éléments traces associés dans les nappes et l'eau des sols hydromorphes. Application au traçage hydrologique.

    OpenAIRE

    Riou , Christine

    1999-01-01

    Mémoires de Géosciences Rennes, n°91, 293 p. ISBN: 2-905532-90-4; Les objectifs de ce travail sont de : (1) mieux comprendre l'hydrochimie des REE dans les eaux douces continentales (2) déterminer le mode de transport des REE dans ces systèmes (dissous/colloïdal) (3) tester les REE comme traceurs des circJlations d'eau dans les bassins versants d'ordre 1 ,en climat océanique tempéré. Le bassin versant de Kervidy (Bretagne) est situé sur un substratum schisteux imperméable. Deux domaines sont ...

  12. L’enseignement du français dans le secondaire et le supérieur au Vietnam de 1918 à 1945 : un état des lieux

    OpenAIRE

    Van Thao, Trinh

    2014-01-01

    Le français dans l’organigramme éducatif du Règlement général de l’instruction publique (1918-1945) L’Indochine, une colonisation ambiguë, 1858-1945, (Paris, F. Maspéro, 1995) de Pierre Brocheux et Daniel Héméry donne bien en annexe un tableau (tableau VIII) qui résume bien l’état des lieux du français dans le système éducatif mis en place par Albert Sarraut en 1918 et qui perdure jusqu’à la fin de la colonisation. Faisons rapidement le point de la situation du français dans le système éducat...

  13. Radon exhalation from granitic rocks

    International Nuclear Information System (INIS)

    Del Claro, Flávia; Paschuk, Sergei A.; Corrêa, Janine N.; Mazer, Wellington; Narloch, Danielle Cristine; Martin, Aline Cristina; Denyak, Valeriy

    2017-01-01

    Naturally occurring radionuclides such as radon ( 222 Rn), its decay products and other elements from the radioactive series of uranium ( 238 U and 235 U) and thorium ( 232 Th) are an important source of human exposure to natural radioactivity. The worldwide evaluation of health radiobiological effects and risks from population exposure to natural radionuclides is a growing concern. About 50% of personal radiation annual dose is related to radionuclides such as radon ( 222 Rn), thoron ( 220 Rn), radium ( 226 Ra), thorium ( 232 Th) and potassium ( 40 K), which are present in modern materials commonly used in construction of dwellings and buildings. The radioactivity of marbles and granites is of big concern since under certain conditions the radioactivity levels of these materials can be hazardous to the population and require the implementation of mitigation procedures. Present survey of the 222 Rn and 220 Rn activity concentration liberated in the air was performed using commercialized Brazilian granite rocks at national market as well as exported to other countries. The 222 Rn and 220 Rn measurements were performed using the AlphaGUARD instant monitor and RAD7 detector, respectively. This study was performed at the Applied Nuclear Physics Laboratory of the Federal University of Technology – Paraná (UTFPR). Obtained results of radon concentration activity in air exhaled studied samples of granites varied from 3±1 Bq/m 3 to 2087±19 Bq/m 3 , which shows that some samples of granitic rocks represent rather elevated health risk the population. (author)

  14. Uranium prospecting using radon (1963)

    International Nuclear Information System (INIS)

    Pradel, J.; Billard, F.; Miribel, J.; Gangloff, A.; Puybaraud, Y.; Tayeb, G.

    1963-01-01

    The radon which diffuses in the ground and which migrates in the atmosphere is a natural radioactive tracer. The study of its production can give useful information on the uranium content and structure of the rocks from which it comes. Numerous authors have therefore suggested that uranium deposits be prospected by means of this radon. Three analytic methods have been used successively by the C.E.A.: the method of accumulation in a hole, the method of instantaneous sampling in the ground, and the method of sampling by scanning. Only the last has proved interesting and has been the object of systematic studies. It consists in purging the measurement recipient with air drawn from the probe and in measuring the variations in activity with time and with the volume drawn up, using a portable apparatus producing scintillations in a sulphurated flask. The first series of measurements made it possible to develop an apparatus (flow rate, hole depth, scintillating probe) and to distinguish between tbe activities of the thoron and of the radon by making two measurements at an interval of 54 seconds. A campaign of systematic sampling was then carried out. It made It possible to show the good reproducibility of the results obtained and tbe good agreement with conventional methods. This method is the best one for areas having large overlap. In the appendix the detector and its mode of use are briefly described, and the first results of an emanometric prospecting test in the Vendee mining division are given. (authors) [fr

  15. Radon as an Anthropogenic Indoor Air Pollutant

    Science.gov (United States)

    Gillmore, Gavin; Crockett, Robin

    2016-04-01

    Radon is generally regarded as a naturally occurring radiological hazard but we report here measurements of significant, hazardous radon concentrations that arise from man-made sources, including granite ornaments/artefacts, uranium glass and glazed objects as well radium dial watches. This presentation concerns an examination and assessment of health risks from radium and uranium found in historical artefacts, many of which were once viewed as everyday items, and the radon that emanates from them. Such objects were very popular in industrialised countries such as the USA, UK and European countries) particularly between and including the two World Wars but are still readily available. A watch collection examined gave rise to a hazardous radon concentration of 13.24 kBq•m-3 approximately 67 times the Domestic Action Level of 200 Bq•m-3.The results for an aircraft altimeter are comparable to those of the watches, indicating radon activity equivalent to several watches, and also indicate an equilibrium concentration in the 16.3 m3 room ca. 33 times the UK domestic Action Level. Results from a granite block indicate a radon emanation of 19.7 Bq•kg-1, but the indicated equilibrium concentration in the 16.3 m3 room is only ca. 1.7% of the UK domestic Action Level. Uranium-glazed crockery and green uranium glass were scoped for radon activity. The former yielded a radon concentration of ca. 44 Bq•m-3 in a small (7 L) sealed container. The latter yielded a lower radon concentration in a larger (125 L) sealed container of ca. 6 Bq•m-3. This is barely above the background radon concentration in the laboratory, which was typically ca. 1-2 Bq•m-3. Individual items then are capable of giving rise to radon concentrations in excess of the UK Domestic Action Level in rooms in houses, particularly if poorly ventilated. We highlight the gap in the remediation protocols, which are focused on preventing radon entering buildings from outside, with regard to internally

  16. Prevalence des ametropies en milieu scolaire au sud-Togo : cas de ...

    African Journals Online (AJOL)

    But : Le but de ce travail est de déterminer la prévalence des vices de réfraction en milieu scolaire au Sud Togo. Matériels et Méthodes : Il s'agit d'une étude transversale réalisée du 24 février au 28 avril 2010 dans la préfecture des Lacs au Sud Togo. Elle a concerné 830 élèves tirés au hasard dans 5 établissements dont 3 ...

  17. Radon in homes of the Portland, Oregon Area: Radon data from local radon testing companies collected by CRM (Continuous Radon Measurement) machines

    Science.gov (United States)

    Whitney, H.; Lindsey, K.; Linde, T.; Burns, S. F.

    2013-12-01

    Students from the Department of Geology at Portland State University paired up with the Oregon Health Authority to better understand radon gas values in homes of the Portland metropolitan area. This study focuses on radon values collected by continuous radon measurement (CRM) machines, taken by local radon testing companies. The local companies participating in this study include Alpha Environmental Services, Inc., Cascade Radon, Environmental Works, The House Detectives, LLC, and Soil Solutions Environmental Services, Inc. In total, 2491 radon readings spanning across 77 zip codes were collected from local companies in the Portland metropolitan area. The maximum value, average value, percentage of homes greater than 4 pCi/L and total rank sum was calculated and used to determine the overall radon potential for each zip code (Burns et al., 1998). A list and four maps were produced showing the results from each category. Out of the total records, 24 zip codes resulted in high radon potential and the average reading for the entire Portland Metropolitan area was 3.7 pCi/L. High potential zip codes are thought to be a result of sand and gravel (Missoula Flood deposits) and faults present in the subsurface. The CRM data was compared with both long-term and short-term data provided by the Oregon Health Authority to validate radon potentials in each zip code. If a home is located in a zip code with high or moderate radon potential across two types of data sets, it is recommended that those homes be tested for radon gas.

  18. Analyse paléoécologique des communautés de micromammifères de la Caune de l’Arago (Tautavel, France) dans le contexte des migrations de faunes en Europe méridionale au cours du Pléistocène moyen

    OpenAIRE

    Hanquet, Constance; Desclaux, Emmanuel

    2014-01-01

    L’étude des faunes de micromammifères a largement contribué à la connaissance des paléoenvironnements au cours du Quaternaire. L’évolution des associations de rongeurs observées dans les niveaux de la Caune de l’Arago datés entre 600 000et 400 000ans (MIS 14 à 12), montre l’apparition de communautés issues d’Europe de l’Est, de Sibérie et des zones montagneuses d’Asie centrale (Ochotona pusilla, Citellus sp., Microtus (Stenocranius) gregalis et Dicrostonyx torquatus), ainsi que d’Europe du No...

  19. Les journalistes français face au « mur » de Cisjordanie: Quelles représentations dans les journaux télévisés de 20h ? (TF1 et France 2, 2002-2007) 

    OpenAIRE

    KERVELLA, Amandine

    2013-01-01

    Ce texte s’intéresse aux représentations du « mur » de Cisjordanie dans journaux télévisés de 20h des deux premières chaînes de télévision françaises : TF1 et France 2. Postulant que le travail journalistique s’apparente à une mise en forme sociale du réel, il cherche à mettre au jour certains des cadres (Goffman, 1991) mobilisés pour représenter une construction particulièrement polémique. Quelle nature les discours médiatiques traitant du « mur » lui prêtent-ils ? S’agit-il d’un « mur » ? D...

  20. Evaluation, au laboratoire, du pouvoir dispersant d'une huile pour moteurs à essence et relation avec les résultats obtenus dans la séquence VE Laboratory Evaluation of the Dispersive Power of Gazoline Engines Oils and Relation with Sequence Ve Test Results

    OpenAIRE

    Hipeaux J. C.; Durand J. P.; Prigent M.; Binet D.; Rossi A.

    2006-01-01

    L'évaluation du pouvoir dispersant d'une huile pour moteurs à essence est incluse dans les spécifications internationales telles que les spécifications du Comité des Constructeurs du Marché Commun (CCMC) et les spécifications de l'American Petroleum Institute (API). Cette évaluation est effectuée à partir d'essais longs, sévères et coûteux sur moteurs au banc. Il s'agit des essais sur moteurs Mercedes M102E (niveaux CCMC G4 et G5) et Ford Pinto 2,3l (niveaux API SG et SH). Le coût de ces essa...

  1. Adaptation, mise à l'épreuve et évaluation d'interventions complexes en santé publique : leçons tirées du Nurse-Family Partnership dans le secteur de la santé publique au Canada

    Directory of Open Access Journals (Sweden)

    S. M. Jack

    2015-01-01

    Full Text Available Introduction : Le Nurse-Family Partnership (NFP est un programme de visites à domicile destiné aux nouvelles jeunes mères défavorisées sur le plan socioéconomique. Les données issues de trois essais contrôlés randomisés (ECR américains ont solidement démontré l'efficacité des interventions quant à l'amélioration de l'issue de la grossesse, de la santé et du développement des enfants ainsi que de l'autonomie économique des mères. Cependant, l'efficacité du NFP dans le contexte canadien des services de santé et des services sociaux, qui diffère de celui des États-Unis, reste à déterminer. Cet article vise à décrire le processus complexe suivi pour adapter la recherche sur le NFP et mettre ainsi en œuvre ce programme au Canada. Méthodologie : L'évaluation menée au Canada se divise en trois étapes : 1 adaptation de l'intervention, 2 mise à l'épreuve de l'intervention dans des études de faisabilité et d'acceptabilité à petite échelle et 3 réalisation d'un ECR et d'une évaluation du processus dans le cadre de l'étude intitulée British Columbia Healthy Connections Project (BCHCP. Cette évaluation à grande échelle permettra d'enrichir la base de données probantes du NFP par la tenue d'une étude supplémentaire sur les mécanismes biologiques susceptibles de témoigner de la relation entre l'intervention et les effets sur le comportement des enfants. Résultats : L'adaptation de la documentation du NFP pour les visites à domicile est un processus continu. Un projet pilote a montré la faisabilité du recrutement des femmes admissibles au NFP. Il a aussi révélé qu'il était préférable au Canada que le NFP soit mis en œuvre par les organismes de santé publique et que les infirmières et infirmiers en santé publique (ISP s'occupent des interventions. Enfin, il a montré que ce programme intensif de visites à domicile a bénéficié d'une réception positive de la part des clientes, des membres de

  2. Designing for Learning Engagement in Remote Communities: Narratives from North of Sixty / Concevoir pour favoriser la participation active à l’apprentissage dans les communautés éloignées : récits d’Au nord du soixantième parallèle

    Directory of Open Access Journals (Sweden)

    Aaron Doering

    2014-08-01

    Full Text Available There are multiple challenges to designing learning experiences for schools in remote communities, including technology and infrastructure limitations, high teacher and administrator turnover, and conflicting interests between local culture and school curricula. In this paper, we offer a brief history of educational initiatives in remote Arctic communities, focusing on: 1 the importance of traditional knowledge, 2 the role of Indigenous culture in school learning materials and activities, and 3 how and why technology might be used to enhance and preserve traditional knowledge, language, and culture. We share implementation examples of one design model, adventure learning, that has successfully engaged learners worldwide in remote and urban communities alike. We conclude by presenting design principles for engaging learners in remote communities through a focus on reflective presence, interaction, educator support, and simplicity of design. These principles are illustrated with a narrative centered on the design of a new online learning environment titled North of Sixty°. Concevoir des expériences d’apprentissage pour les écoles de communautés éloignées comporte de multiples défis, relatifs notamment aux limites liées à la technologie et aux infrastructures, au haut taux de roulement des enseignants et administrateurs et aux intérêts conflictuels entre la culture locale et le programme scolaire. Dans cet article, nous offrons un bref historique des initiatives éducatives dans les communautés arctiques éloignées, en mettant l’accent sur : 1 l’importance du savoir traditionnel, 2 le rôle de la culture autochtone dans le matériel et les activités d’apprentissage scolaire, et 3 les raisons et les façons d’utiliser la technologie pour renforcer et préserver les connaissances, la langue et la culture traditionnelles. Nous partageons des exemples de mise en œuvre d’un modèle de conception, l’apprentissage par l

  3. Écrire « au nom de l’Abeille, du Papillon et de la Brise » : figures animalières et paysagères dans les écrits d’Emily Dickinson.

    Directory of Open Access Journals (Sweden)

    Estève Marie

    2012-05-01

    Full Text Available L’article propose une lecture de textes d’Emily Dickinson à travers le prisme de l’anthropologie, de la philosophie et de la pensée du paysage contemporaines (Latour, Descola, Deleuze-Guattari, Jullien, Meillassoux, Haraway, Tsing, Berque, afin d’exposer comment l’écriture de Dickinson crée des figures animales qui participent d’une expérience commune de l’environnement. À partir de l’énonciation d’une poétique animalière et paysagère dans quelques poèmes de jeunesse et dans l’ouverture du premier fascicule, on étudiera les relations au contexte du XIXe siècle et au projet poétique de reprise du lyrisme. On s’intéressera particulièrement à la transformation des tropes animaliers classiques, grâce à la circulation des voix et à la passation de la parole poétique aux figures animales et paysagères, qui constituent le monde de nombreux poèmes dickinsoniens.The article aims at reading some of Emily Dickinson’s texts through the prism of contemporary anthropology, philosophy (Latour, Descola, Deleuze-Guattari, Jullien, Meillassoux, Haraway, Tsing and landscape theory (Berque to present how Dickinson creates animal figures to achieve and express a community of experience in the environment. The article studies how animal figures are introduced in a few early poems and in the beginning of the first fascicle to encompass their relating to XIXth context and to the poetic project to write from within the tradition of lyricism while transforming traditional animal tropes, thanks to the circulation of voices and the passing of the poetic wording (and worlding to relaying animal and other landscape figures.

  4. Kyste hydatique du foie rompu dans la paroi abdominale et dans le muscle psoas: a propos d�une rare observation

    Directory of Open Access Journals (Sweden)

    Issam En-Nafaa

    2011-09-01

    Full Text Available Le kyste hydatique du foie est une parasitose qui sevit a l'etat endemique au maroc. La rupture dans la paroi abdominale et dans le psoas est une complication exceptionnelle. Nous rapportons un cas de kyste hydatique du foie rompu dans la paroi et dans le muscle psoas. Le diagnostic a ete etabli sur les donnees de l'echographie et surtout de la tomodensitometrie. Le patient a ete opere avec des suites simples.

  5. A complete low cost radon detection system

    International Nuclear Information System (INIS)

    Bayrak, A.; Barlas, E.; Emirhan, E.; Kutlu, Ç.; Ozben, C.S.

    2013-01-01

    Monitoring the 222 Rn activity through the 1200 km long Northern Anatolian fault line, for the purpose of earthquake precursory, requires large number of cost effective radon detectors. We have designed, produced and successfully tested a low cost radon detection system (a radon monitor). In the detector circuit of this monitor, First Sensor PS100-7-CER-2 windowless PIN photodiode and a custom made transempedence/shaping amplifier were used. In order to collect the naturally ionized radon progeny to the surface of the PIN photodiode, a potential of 3500 V was applied between the conductive hemi-spherical shell and the PIN photodiode. In addition to the count rate of the radon progeny, absolute pressure, humidity and temperature were logged during the measurements. A GSM modem was integrated to the system for transferring the measurements from the remote locations to the data process center. - Author-Highlights: • Low cost radon detection. • Integrated GSM modem for early warning of radon anomalies. • Radon detection in environment

  6. Modeling of radon transport in unsaturated soil

    International Nuclear Information System (INIS)

    Chen, C.; Thomas, D.M.; Green, R.

    1995-01-01

    This study applies a recently developed model, LEACHV, to simulate transport of radon through unsaturated soil and compares calculated soil radon activities against field-measured values. For volatile and gas phase transport, LEACHV is modified from LEACHP, a pesticide version of LEACHM, as well-documented one-dimensional model for water and chemical movement through unsaturated soil. LEACHV adds consideration of air temperature changes and air flow driven by barometric pressure change to the other soil variables currently used in LEACHP. It applies diurnal barometric pressure and air temperature changes to reflect more accurately the typical field conditions, Sensitivity analysis and simulated results have clearly demonstrated the relative importance of barometric pressure change, rainfall events, changes in water content, gas advection, and radon source term in radon transport process. Comparisons among simulated results illustrated that the importance of barometric pressure change and its pumping phenomenon produces both fluctuation in soil gas radon activities and an elevation of the long-term average radon activity in shallow soils of an equal magnitude to the disturbed source parameter. Comparisons between measured and simulated soil radon activities showed that LEACHV can provide realistic estimates of radon activity concentration in the soil profile. 41 refs., 10 figs., 2 tabs

  7. Effects of radon in indoor air studied

    International Nuclear Information System (INIS)

    Auvinen, A.

    1994-01-01

    Radon is an odorless, tasteless and colourless radioactive noble gas that enters indoor air from the ground. Radon causes lung cancer. A committee set up to evaluate the health risks of chemical substances has been drafting a report on radon, which will compile the major research findings on the lung cancer risk posed by radon. Animal tests have shown that even small doses of radon can cause lung cancer. Smokers seem to contract radon-induced lung cancer more readily than non-smokers. Because research findings have been conflicting, however, it is not known exactly how high the risk of lung cancer caused by indoor radon exposure really is. Several major research projects are under way to obtain increasingly accurate risk assessments. An on-going European joint project brings together several studies - some already finished, some still being worked on. In this way it will be possible to get more accurate risk assessments than from individual studies. In order to prevent lung cancer, it is important to continue the work of determining and reducing radon connects and to combat smoking. (orig.)

  8. Radon exposures in caves in Hungary

    International Nuclear Information System (INIS)

    Csige, I.; Hunyadi, I.; Hakl, J.; Geczy, G.; Varhegyi, A.; Lenart, L.; Toerocsik, I.

    1996-01-01

    We have measured radon exposures and estimated effective doses from inhaled radon and its decay products (according to the proposals of the ICRP65) for different groups visiting Hungarian karstic caves. We have found highest doses are received by staff members of therapeutic treatments, tour guides in some caves and by the most active cavers. (author)

  9. Radon measurements in mines and dwellings

    International Nuclear Information System (INIS)

    Urban, M.

    1985-01-01

    Radon measurements using a time integrating passive radon dosemeter (MAKROFOL track etch detector) have been performed in Brazilian and German mines and dwellings. The present state of the measurement technique is summarized. The results are presented together with exposure calculations and dose estimations for occupational exposure in open pit and underground mines and for the general public in houses. (orig./HP) [de

  10. How much radon is too much?

    International Nuclear Information System (INIS)

    Atwood, C.H.

    1991-01-01

    In recent years the concerns over human exposure to radon have become more pressing. This paper will attempt to explain the phenomenon of radon gas in the home, how it can be detected and measured and what are the maximum permissible exposure levels. The talk is aimed primarily at teachers who wish to introduce this material into their classroom discussions

  11. Radon diagnostics and tracer gas measurements

    International Nuclear Information System (INIS)

    Jilek, K.; Brabec, M.

    2004-01-01

    An outline is presented of the tracer gas technique, which is used for continuous measurements of air ventilation rate (generally time-varying) and for simultaneous estimation of air ventilation rate and radon entry rate, and some of its limitations are discussed. The performance of this technique in the calculation of the air ventilation rate is demonstrated on real data from routine measurements. The potential for air ventilation rate estimation based on radon measurements only is discussed. A practical application is described of the tracer gas technique to a simultaneous estimation of the air ventilation rate and radon entry rate in a real house where the effectiveness of radon remedy was tested. The following main advantages of the CO tracer gas techniques are stressed: (i) The averaging method continuous determination of the ventilation rate with good accuracy (≤ 20 %). (ii) The newly presented and verified method based on simultaneous measurements of radon concentration and CO gas concentration enables separate continuous measurements of the radon entry rate and ventilation rate. The results of comparative measurements performed with the aim to estimate the inaccuracy in determination of radon entry rate showed acceptable and good agreement up to approximately 10 %. The results of comparative measurements performed with the aim to estimate the mutual commensuration of the method to the determination of the ventilation rate confirmed the expected unreliability the two parametric non-linear regression method, which is the most frequently used method in radon diagnostic in the Czech Republic

  12. Nuclear literacy in light of radon

    International Nuclear Information System (INIS)

    Lazar, I.; Cziegler, I.

    2000-01-01

    Since 1992 the RAD Lauder Laboratory has carried out a survey of indoor radon levels all over Hungary. The co-workers of RAD Lauder were pupils and teachers in local schools. More than 50,000 people have taken the survey and received detailed information on the radon levels in their homes. (authors)

  13. Development of a portable radon progeny monitor

    International Nuclear Information System (INIS)

    Iimoto, Takeshi; Kosako, Toshiso; Sugiura, Nobuyuki

    2000-01-01

    Important nuclides in the radon family contributing to the effective dose are the members of the radon short-life progeny, 218 Po and 214 Po and direct measurement of these progenies is suitable for dosimetry. Survey of the radon progeny concentrations in a number of dwellings and offices is very difficult because we have no convenient instrument for the measurement. At present, radon dosimetry is carried out based on the concentration of the parent radon itself. Therefore, for accurate estimation of public or personal effective dose, it is necessary to develop a facile and portable radon progeny monitor. In this study, a portable radon progeny monitor (PRPM) was designed and developed to automatically estimate the individual progeny concentration in the natural environment. The properties of PRPM were investigated. The dimensions of the entire instrument were 65 x 145 x 170 mm and the total weight was 780 g. The portability of PRPM was much superior to the conventional instrument. The PRPM can operate automatically to estimate individual progeny concentration. All component materials of the monitor were selected based on the data of specified performance, cost performance and availability bon the market. The concentration of individual radon progeny was estimated by the build-up decay. It was concluded that PRPM is much suitable for outdoor study and personal dose estimation, as well as indoor measurement. In the field survey, especially in mines and caverns, PRPM is found as a valuable and convenient instrument. (M.N.)

  14. Indoor radon measurements in Athens, Greece

    International Nuclear Information System (INIS)

    Proukakis, C.; Molfetas, M.; Ntalles, K.; Georgiou, E.; Serefoglou, A.

    1987-01-01

    A pilot study was carried out in order to measure air concentrations of radon 222 and 220 isotopes in Athenian houses, as a first step of a national survey in Greece. In this paper the authors deal with radon concentration in air and water and will rely on measurements conducted in Greece. (author)

  15. RADON DOSIMETRY FOR WORKERS: ICRP'S APPROACH.

    Science.gov (United States)

    Marsh, James W; Laurier, Dominique; Tirmarche, Margot

    2017-12-01

    The International Commission on Radiological Protection (ICRP) has recently published two reports on radon exposure; Publication 115 on lung cancer risks from radon and radon progeny and Publication 126 on radiological protection against radon exposure. A specific graded approach for the control of radon in workplaces is recommended where a dose assessment is required in certain situations. In its forthcoming publication on Occupational Intakes of Radionuclides (OIR) document, Part 3, effective dose coefficients for radon and thoron will be provided. These will be calculated using ICRP reference biokinetic and dosimetric models. Sufficient information and dosimetric data will be given so that site-specific dose coefficients can be calculated based on measured aerosol parameter values. However, ICRP will recommend a single dose coefficient of 12 mSv per working level month (WLM) for inhaled radon progeny to be used in most circumstances. This chosen reference value was based on both dosimetry and epidemiological data. In this paper, the application and use of dose coefficients for workplaces are discussed including the reasons for the choice of the reference value. Preliminary results of dose calculations for indoor workplaces and mines are presented. The paper also briefly describes the general approach for the management of radon exposure in workplaces based both on ICRP recommendations and the European directive (2013/59/EURATOM). © Crown copyright 2017.

  16. Radon variations in a Hungarian village

    Energy Technology Data Exchange (ETDEWEB)

    Toth, E. [Lauder Radon Lab., Budapest (Hungary); Deak, F. [Eoetvoes Univ., Budapest (Hungary). Dept. of Atomic Physics; Gyurkocza, C.S. [Technical Univ., Budapest (Hungary). Inst. of Nuclear Technology; Kasztovszky, Z.S. [Eoetvoes Univ., Budapest (Hungary). Dept. of Atomic Physics; Kuczi, R. [Lauder Radon Lab., Budapest (Hungary); Marx, G. [Eoetvoes Univ., Budapest (Hungary). Dept. of Atomic Physics; Nagy, B. [Hungarian Academy of Sciences, Budapest (Hungary). Section of Earth Sciences; Oberstedt, S. [SCK, CEN, Mol (Belgium); Sajo-Bohus, L. [Eoetvoes Univ., Budapest (Hungary). Dept. of Atomic Physics; Suekoesd, C.S. [Technical Univ., Budapest (Hungary). Inst. of Nuclear Technology; Toth, G. [National Geological Inst., Budapest (Hungary); Vajda, N. [Technical Univ., Budapest (Hungary). Inst. of Nuclear Technology

    1997-05-01

    A steady radon exhalation is assumed in most publications. In a village of North-East Hungary, however, high radon concentrations have been measured, differing strongly in neighbouring houses and varying in time, due to the interplay of geochemical phenomena. (orig.)

  17. Radon Reduction Methods: A Homeowner's Guide.

    Science.gov (United States)

    Environmental Protection Agency, Washington, DC.

    The U.S. Environmental Protection Agency (EPA) is studying the effectiveness of various ways to reduce high concentrations of radon in houses. This booklet was produced to share what has been learned with those whose radon problems demand immediate action. The booklet describes nine methods that have been tested successfully--by EPA and/or other…

  18. Radon Measurement in Schools. Revised Edition.

    Science.gov (United States)

    Environmental Protection Agency, Washington, DC.

    The Environmental Protection Agency (EPA) and other major national and international scientific organizations have concluded that radon is a human carcinogen and a serious environmental health problem. The EPA has conducted extensive research on the presence and measurement of radon in schools. This report provides school administrators and…

  19. Removal of Radon from Household Water.

    Science.gov (United States)

    Environmental Protection Agency, Washington, DC. Office of Research and Development.

    By far, the greatest risk to health from radon occurs when the gas enters the house from underlying soil and is inhaled. The U.S. Environmental Protection Agency (EPA) is studying ways to reduce radon in houses, including methods to remove the gas from water to prevent its release in houses when the water is used. While this research has not…

  20. Radon Measurements in Schools: An Interim Report.

    Science.gov (United States)

    Environmental Protection Agency, Washington, DC. Office of Radiation Programs.

    Radon-222 is a colorless, odorless, tasteless, radioactive gas that occurs naturally in soil, rocks, underground water, and air. The United States Environmental Protection Agency (EPA) and other scientific organizations have identified an increased risk of lung cancer associated with exposure to elevated levels of radon in homes. Schools in many…

  1. 40 CFR 61.203 - Radon monitoring and compliance procedures.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 8 2010-07-01 2010-07-01 false Radon monitoring and compliance... for Radon Emissions From Phosphogypsum Stacks § 61.203 Radon monitoring and compliance procedures. (a..., each owner or operator of an inactive phosphogypsum stack shall test the stack for radon-222 flux in...

  2. Find a Radon Test Kit or Measurement and Mitigation Professional

    Science.gov (United States)

    Find a qualified radon service professional to fix or mitigate your home. If you have questions about a radon, you should contact your state radon contact and/or contact one or both of the two privately-run National Radon Proficiency Programs

  3. Estimation of Indoor Radon from Concrete Blocks Used In ...

    African Journals Online (AJOL)

    Radon gas is the most important source of natural radiation. Indoor radon concentration is the main path of human exposure to high radon concentration. Radon contribution from concrete block walls of typical Nigerian dwellings has been estimated from gamma ray spectroscopy measurements of radium concentration ...

  4. Quelle place au travail des agriculteurs dans la fabrication d’une agriculture durable ? How does the work of the farmers fits in the making of a sustainable agriculture? Que lugar tiene el trabajo de los agricultores en la construcción de una agricultura sostenible ?

    Directory of Open Access Journals (Sweden)

    Pascal Béguin

    2011-05-01

    Full Text Available Après avoir rappelé le contexte de mutation que connaît actuellement le secteur agricole, nous nous interrogeons sur la place du travail dans la fabrication d’une agriculture durable. Dans cette perspective, nous soulignons trois types d’enjeux. Le premier est relatif à l’objectivation des liens travail-santé. En effet, les conditions de travail se dégradent dans le secteur et celui-ci génère de l’exclusion. Et il est loin d’être attractif. Le second renvoie au lien entre conception et travail. L’agriculture actuelle n’est pas soutenable. Et les pratiques productives des agriculteurs sont en pleine mutation. Mais encore faut-il que ces techniques soient actionnables dans le travail. Nous désignons donc trois voies à la prise en compte du travail dans la conception. Le troisième enjeu est relatif au vivre ensemble. Le développement durable pose en effet très profondément la question d’un futur à faire advenir collectivement. Nous considérons alors cette dimension politique comme un « projet », en posant la question de la prise en compte des projets des agriculteurs dans la définition des visées du développement durable.This paper is focused on work in the making of a sustainable agriculture. We emphasize three types of issue. The first one is related to the objectification of occupational health. Agriculture is a tough sector, which produces exclusion and which is far from attractive. The second is related to design. Farming today is not sustainable, and technical systems need to be designed. But the changes need to be actionable at work. So we present three ways needed in order to think out the workers’ activity during the design process. The third issue is related to Policy: sustainable development is also a future to bring together. We suggest that this collective dimension could be grasped as a « project », which takes into consideration the projects of farmers in order to define the aims of

  5. La cardiomyopathie dilatee au centre hospitalier Universitaire ...

    African Journals Online (AJOL)

    But : Afin d'améliorer la prise en charge, d'éviter l'évolution rapide vers une insuffisance cardiaque réfractaire au traitement, nous avons entrepris cette étude en milieu hospitalier. Méthode : il s'est agi d'une étude rétrospective et descriptive dans le service de cardiologie du Centre Hospitalier Universitaire Tokoin de Lomé.

  6. Radon risk map of the city Brno

    International Nuclear Information System (INIS)

    Jansky, J.

    2000-01-01

    Data of radon risk mapping of the city Brno area from 1992 to 1999 were collected from databases of six private companies measuring radon risk there. The data sets are completed now. The first results are presented in this paper. In the city Brno area only low (385 measured sites) and medium (300) radon risk categories were found. The largest number of measured areas were situated in places with loess and loess loam (total quantity 344 sites, with medium radon risk category 158 sites), recent fluvial sediments (64, 32) and anthropogenous deposits (61, 23). High values of radon volume activity in soil gas were found predominantly in Quaternary sediments and in granodiorite, type Veverska Bityska, low values in leucotonalite and metabasalt. (author)

  7. The radon transform in digital image processing

    International Nuclear Information System (INIS)

    Beyerer, J.; Leon, F.P.

    2002-01-01

    The Radon transform develops an image according to a ''system of functions'' consisting of δ-lines. Thus, the Radon transform of a signal b(x 1 , x 2 ) represents the set of all parallel projections of b(x 1 , x 2 ). The Radon transform maps linear signal components onto pronounced extrema which can be detected very robustly. The coordinates of these peaks are reliable estimates of the geometrical parameters of collinear structures. In the paper, the increase of the signal-to-noise ratio for such structures in the Radon domain is discussed quantitatively. Moreover, the application of the Radon transform for image enhancement is demonstrated. Further topics concern its efficient implementation based on the central slice theorem, the connection with the Hough transform as well as examples on more complex applications. (orig.) [de

  8. Novel Radon Sub-Slab Suctioning System

    DEFF Research Database (Denmark)

    Rasmussen, Torben Valdbjørn

    2013-01-01

    A new principle for radon protection is currently presented which makes use of a system of horizontal pressurised air ducts located within the lower part of the rigid insulation layer of the ground-floor slab. The function of this system is based on the principles of pressure reduction within...... a grid of horizontal air ducts with low pressure which are able to remove air and radon from the ground. Results showed the system to be effective in preventing radon infiltrating from the ground through the ground-floor slab, avoiding high concentrations of radon being accumulated inside houses....... For the system to be effective, the pressure within the ducts must be lower than the pressure inside the house. The new principle was shown to be effective in preventing radon from polluting the indoor air by introducing low pressure in the horizontal grid of air ducts. A lower pressure than the pressure inside...

  9. Radon therapy in the Soviet Union

    International Nuclear Information System (INIS)

    Sansoni, B.; Andrejew, S.V.

    1991-08-01

    In the Soviet Union approximately one million courses of radon treatment each lasting three weeks are prescribed every year. The curative application of radon used for cardiovascular diseases, including aftercare in cases of cardiac infarction, disorders of the locomotor system and joints and muscles, the male and female sexual system, diseases of the nervous system, endocrinology and metabolic diseases. Contraindication practice is similar to that in Central Europe. Radon is given to skin stimulation by wet and above all dry baths. The radiation exposure of patients from these three-week radon treatments is relatively low. The radon effect is interpreted as 'radiation flash' stimulating the nervous system. The skin plays a particular role in this process, acting as the stimulus acceptor. (orig./MG) [de

  10. Indoor radon levels in coastal Karnataka

    International Nuclear Information System (INIS)

    Narayana, Y.; Radhakrishna, A.P.; Somashekarappa, H.M.; Karunakara, N.; Balakrishna, K.M.; Siddappa, K.

    1995-01-01

    Indoor radon levels have been measured in selected dwellings of coastal Karnataka using LR-115 type II peelable films and it is found to vary from 28.4 to 45.6 Bq m -3 with a geometric mean value of 35.7 Bq m -3 . The annual effective dose equivalent to the population of the region due to inhalation of radon was estimated from the measured data on radon level and is found to be in the range 1.9 - 3.1 mSv y -1 with a mean value 2.4 mSv y -1 . The correlation between indoor radon level and radium content in the underlying soil were studied. No definite correlation was observed to exist between indoor radon level and radium content in soil. (author). 24 refs., 2 tabs

  11. Radon: implications for the health professional

    International Nuclear Information System (INIS)

    Romano, C.A.

    1990-01-01

    Radon is a colorless, odorless gas formed by radioactive decay of radium and uranium, which are naturally present in the earth's crust. When concentrated indoors, this invisible gas becomes a potential health hazard. The Environmental Protection Agency estimates that up to 20,000 lung cancer deaths annually can be attributed to prolonged radon exposure. Radon is an important health issue that should be understood by all health care professionals. This paper discusses some of the important issues regarding radon, such as the incidences of lung cancer believed to be attributable to radon, the high-risk areas in the United States, federal safety guidelines, and public apathy. These issues and their impact on the health care required by professionals, especially nurse practitioners, are discussed

  12. Metrology of radon and thoron concentrations

    International Nuclear Information System (INIS)

    Durcik, M; Vicanova, M.

    1998-01-01

    The alpha spectrometry measurements of radon (radon-222) and thoron (radon-220) concentrations by ionisation chamber, used only in laboratory conditions are described in this paper. For the measurements of radon and thoron in dwellings and work areas was proposed diffusion double chamber detector with track detector. The described dosimeter is very useful for routine measurement and would be applied in measuring of radon and thoron concentrations in caves and dwellings. Big disadvantage of the dosimeter is small holes in cover and it could not be used in dusty areas. From previous measurements of the equilibrium equivalent thoron concentrations by semiconductor detector the measured values ranged from 0.1 to 5.6 Bq m -3 in the Slovak kindergartens were obtained

  13. Radon risk perception and testing: Sociodemographic correlates

    International Nuclear Information System (INIS)

    Halpern, M.T.; Warner, K.E.

    1994-01-01

    While numerous health education campaigns have been carried out to alert the public to radon's potential dangers and to encourage testing and mitigation, there has been little follow-up to determine which segments of the public are now most aware of the possible hazards of radon. Using information from the 1990 National Health Interview Survey (NHIS), the authors have examined beliefs regarding radon and radon-testing activities among different sociodemographic groups. They used logistic regression to determine the relationship between these beliefs and actions and age, gender, education, income, minority status, and smoking status. The results suggest relatively superficial knowledge regarding radon, and very little testing, within the survey population. In particular, significantly less knowledge was observed among female and minority respondents, while less testing behavior was seen among older respondents. Lower educational levels and lower family income were associated with both decreased knowledge and testing. Recommendations for future education campaigns are discussed

  14. Development of a portable radon detection system

    International Nuclear Information System (INIS)

    Allen, J.W.

    1976-09-01

    The presence of radon-222 in soil gas and ground water can indicate the existence of nearby uranium deposits even when heavy overburdens completely absorb the associated gamma radiation. Techniques to detect and measure radon have evolved during the past several years to the point where radon prospecting is routinely employed in a number of countries. A program to develop and field test a prototype system for measuring radon from soil gas and water is described. A prototype system employing a flow through scintillation detector was designed and constructed, utilizing standard commercial components, to provide a fieldworthy unit for testing the system concepts. Laboratory and preliminary field tests of this unit indicate that it can detect anomalous radon levels of less than 10 picoCuries per liter (pCi/l) in soil gas and ground water

  15. United Kingdom radon programme: policy and progress

    International Nuclear Information System (INIS)

    Dron, E.M.

    1994-01-01

    The United Kingdom is pursuing a substantial and evolving programme towards minimising the problem of high radon levels in homes. Work focuses on those areas of the country which early surveys have shown to have a significant proportion of affected homes, and involves cooperation between central and local Government, research institutions and private companies. Elements of the programme include: radon measurements on demand from householders in areas of potentially high radon and systematic surveys to refine knowledge of these areas; research into geological, epidemiological, psychological and financial aspects of the problem; the development and dissemination of advice on remedial and preventive measures; and a comprehensive approach to communication with all parties involved in issues of domestic exposure to radon. An account of progress is given, and future options are outlined towards fulfilling the Government's intention that substantial progress towards dealing with the impact of radon should be made by the close of the century. (author)

  16. Uranium and radon surveys in western Himalaya

    International Nuclear Information System (INIS)

    Virk, H.S.

    1997-01-01

    The water samples from mountain springs, streams and river systems in the western Himalaya were collected and analysed in the laboratory for uranium and radon contents. It is observed that the Himalayan river system is conspicuous by its high dissolved uranium and radium concentration. The water samples contain from 0.89 ppb to 63.4 ppb of uranium and from 34 Bq/I to 364 Bq/I of radon. The radon emanation in soil is measured by the track-etch method, emanometry and alpha-logger technique. The daily and long-term variation of radon was monitored in some mineralized zones of Himachal Pradesh (HP) state with high uranium content in the soil. The maximum values of radon are recorded in Chhinjra, Rameda, Samurkala and Kasol areas of HP. (author)

  17. Radon in houses and soil of Croatia

    Energy Technology Data Exchange (ETDEWEB)

    Radolic, V.; Vukovic, B.; Stanic, D.; Miklavcic, I.; Planinic, J. [Osijek Univ., Dept. of Physics (Croatia)

    2006-07-01

    Long-term indoor radon measurements in thousand Croatian homes, randomly selected, were performed by the LR-115 track etch detectors during a year 2003/2004. The obtained values of arithmetic means of radon concentrations in 20 Croatian counties were in range from 33 to 198 Bq/m{sup 3}, while the arithmetic and geometric means for Croatia were 68 and 50 Bq/m{sup 3}, respectively. Indoor radon concentrations follow log-normal distribution and the percentage of dwellings with concentrations above 400 Bq/m{sup 3} was 1.8 %. Radon concentrations in soil gas, at depth of 0.8 m, were measured by 'Alphaguard' measuring system. Association between levels of indoor and soil radon was investigated. (authors)

  18. La pisciculture permet de lutter contre les carences alimentaires au ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    11 avr. 2014 ... Dans la province de Prey Veng, au Cambodge, les agriculteurs jouent un rôle fondamental dans l'essai d'un nouveau système d'exploitation agricole conçu pour contrer ... Il vise tout particulièrement les personnes vulnérables, à savoir les enfants de moins de cinq ans et les femmes en âge de procréer.

  19. Détermination de la solubilité du tétrahydrothiophène (THT) liquide dans les principaux constituants du gaz naturel (CH4, CO2 et N2) au moyen d'un dispositif dynamique avec analyse chromatographique en ligne de la phase vapeur

    Science.gov (United States)

    Ghanem, G.; Tagand, G.; Loiseleur, H.; Ingrain, D.; Jose, J.

    1998-05-01

    Some odorous products as tetrahydrothiophene (THT) whose odour is perceived at low concentration, are injected in natural gas in order to odorize it. This artificial odorization allows to detect immediately any gas leak in atmosphere. The authors have measured the equilibrium compositions of gaseous phases for binaires THT-CH4, THT-N2 and THT-CO2 in the transport and distribution conditions of natural gas [ {1 gaz naturel en vue de son odorisation. Cette odorisation artificielle rend toute fuite éventuelle de gaz dans l'atmosphère immédiatement détectable. Les auteurs ont mesuré les compositions à l'équilibre des phases gaseuses des binaires THT-CH4, THT-N02 et THT-CO2 dans les conditions de transport et de distribution du gaz [ {1 < P (bar) < 60} and {-30 < t(^circ C) < 50}] . Dans ce but, un dispositif expérimental original basé sur un principe de saturation dynamique avec analyse chromatographique en ligne de la phase vapeur a été réalisé et mis au point. Des grandeurs thermodynamiques supplémentaires sont nécessaires pour atteindre les compositions molaires de la phase vapeur. Les auteurs ont mesuré les pressions de vapeur du THT et estimé les seconds coefficients du viriel. Ces estimations font intervenir les grandeurs critiques et facteurs acentriques qui ont été calculés par diverses corrélations.

  20. Fluid-based radon mitigation technology development for industrial applications

    International Nuclear Information System (INIS)

    Liu, K.V.; Gabor, J.D.; Holtz, R.E.; Gross, K.C.

    1996-01-01

    The objective of the radon mitigation technology development effort is to develop an efficient and economical radon gas removal technology based on a fluid absorption process. The technology must be capable of cleaning up a wide range of radon gas stream concentrations to a level that meets EPA gas emission standards for residential and industrial applications. Argonne has recently identified a phenomenon that offers the possibility of radon recovery from the atmosphere with high efficiency at room temperature, and radon release at slightly elevated temperatures (50-60 degrees C.) such a device would offer numerous substantial advantages over conventional cryogenic charcoal systems for the removal of radon. Controlled sources of radon in Argonne's radon research facility are being used to quantitatively assess the performance of a selected class of absorbing fluids over a range of radon concentrations. This paper will discuss the design of laboratory- and engineering-scale radon absorption units and present some preliminary experimental test results