Sample records for barc

  1. BARC highlights '88

    Highlights of research and development activities of the Bhabha Atomic Research Centre (BARC), Bombay during 1988 are presented in chapters entitled: Physical Sciences, Chemical Sciences, Materials and Materials Sciences, Radioisotopes, Reactors, Fuel Cycle, Radiological Safety and Protection, Electronics and Instrumentation, Engineering Services, and Life Sciences. Main thrust of the R and D activities of BARC is on nuclear power reactor technology and all stages of nuclear fuel cycle. Some activities are also in the frontier areas such as high temperature superconductivity and inertial confinement fusion. (M.G.B.). figs., tabs., coloured ills

  2. Accelerator development in BARC

    Charged particle accelerators have played crucial role in the field of both basic and applied sciences. This has been possible because the accelerators have been extensively utilized from unraveling the secrets of nature to diverse applications such as implantation, material modification, medical diagnostics and therapy, nuclear energy and clean air and water. The development of accelerators in BARC can be categorized in two broad categories namely proton and heavy ion based accelerators and electron based accelerators. The heavy ion accelerators with sufficiently high energies are currently being used for conducting frontline nuclear and allied research whereas the electron accelerators are being routinely used for various industrial applications. Recently, there is a strong interest for developing the high energy and high intensity accelerators due to their possibility of effective utilization towards concept of energy amplification (Accelerator Driven System), incineration nuclear waste and transmutation. This talk will discuss details of the accelerator development program in BARC with particular emphasis on the recent development at Low Energy High Intensity Proton Accelerator (LEHIPA) Facility in Ion Accelerator Development Division, BARC. (author)

  3. BARC highlights 86

    The Bhabha Atomic Research Centre (BARC), Bombay, is the premier multidisciplinary research establishment of the Department of Atomic Energy (India). It provides Research and Development (R and D) support to the nuclear programmes of the country. Some of its important R and D activities and achievements during 1986 are described in brief in the chapters entitled: Physical Sciences, Chemical Sciences, Materials and Materials Sciences, Life Sciences, Reactors, Fuel Cycle, and Electronics and Instrumentation. The entire text is illustrated with a number of diagrams and photographs. (M.G.B.)

  4. BARC solution for burn injuries


    The Bhabha Atomic Research Centre (BARC), has developed Hydrogel which is expected to be mass marketed soon in India. Dr Anil Kakodkar, Chairman of Atomic Energy Commission, said the product not only heals the wound, but also eliminates scars (1/2 page).

  5. Engineering ceramics development in BARC

    The non-nuclear ceramics research and development activities in BARC encompass the oxides carbide and nitride of light elements. The major thrust areas have been towards development of engineering ceramics like alumina, zirconia, silicon carbide and silicon nitride. The present paper summarises the research activities regarding these ceramics especially on powder synthesis and shape fabrication by injection moulding, reaction-sintering and activated sintering. The stability of silicon carbide in oxygen containing atmosphere is highlighted. (orig.)

  6. Electron accelerators programme at BARC

    Electron beams have established themselves as potential tools in the field of basic sciences. They have been employed as probes for unfolding the secrets of nature in the field of physics, chemistry, biology, metallurgy, agriculture etc. The applied sciences also have been immensely influenced by their vast potential. Even the industry could not remain isolated from their impact. It is evident from the processing of the materials which has gone through a dramatic change. To quote a few example's, the curing of coatings and adhesives, coloring of diamonds, irradiation of food, cross linking of cables, sterilization of medical products, treatment of pathogenic germs etc. have gone through a radical transformation. Similarly, the electron generated photon beams are finding vast applications in the field of radiography, radiation therapy and the strategic areas like defense. Free electron lasers have found a good berth in medicines and material sciences. BARC had long back realized the enormous potential of these beams and chalked out an elaborate programme for developing these accelerators. A brief account of the programme is given

  7. New generation of bottom anti-reflective coatings (BARCs): photodefinable BARCs

    Guerrero, Douglas J.; Trudgeon, Tonya


    Three polymer systems, polycarbonates, polysulfonyl esters, and hybrid carbonate-sulfones, were evaluated as materials for a new generation of bottom anti-reflective coatings (BARCs). The polymers were tested for their solubility in accepted industry solvents, resistance to photoresist solvents after casting, thermal stability, and photosensitivity. From these, polysulfonyl esters show more promising properties as photodefinable BARCs than the other systems because of their good solvent solubility and resistance to photoresist solvents after casting. These polymers can be formulated in ethyl lactate (EL) or 1-methoxy-2-acetoxypropane (PGMEA) but are insoluble in the same solvents after curing above 170°C. The polysulfonyl esters were thermally stable up to ~300°C in air. The cured films were exposed with DUV light at 200 to 600 mJ/cm2. After exposure, the films can be easily removed in alkaline developer.

  8. Criticality calculations on BARC parallel processor- ANUPAM

    Parallel processing offers an increase in computational speed beyond the technological limitations of single processor systems. BARC has recently developed a parallel processing system (ANUPAM) based Multiple Instruction Multiple Data (MIMD) distributed memory architecture. In the work reported here, the sequential version of Monte Carlo code MONALI is modified to work on the ANUPAM for criticality calculations. The problem of random number generation in a parallel environment is handled using leapfrog technique. The code is modified to use variable number of slave processors. The parallel version of MONALI is used to calculate multiplication factor, fluxes and absorptions in one of the 8x8 fuel assemblies of IAEA BWR benchmark in 69 groups. To compare gain in execution time, the benchmark is also solved on LANDMARK and ND-570 systems (both serial) using the sequential version of the code. Speedup and efficiencies achieved on varying the number of slave processors are encouraging. (author). 5 refs., 1 tab

  9. Neutron beam research at BARC (India) and international collaboration

    Ramanadham, M.; Mukhopadhyay, R. [Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai (India)


    Neutron beam research started in India more than four decades ago. Presently, the National Facility for Neutron Beam Research, NFNBR is located in Dhruva, a 100 MW research reactor. The entire facility, including the development of neutron detectors, is the result of indigenous efforts of the participating scientists from Bhabha Atomic Research Centre, BARC. NFNBR is accessible to national and international collaborations, and about forty research groups from various institutions have already availed this facility. Active collaboration with ISIS started since 1984, when the day-1 spectrometer, built at BARC, became operational at ISIS. The collaboration continued with the fabrication, at BARC, of parts for OSIRIS spectrometer. Many neutron beam researchers from BARC have carried out collaborative experiments using the neutron sources at USA, France, Germany, Switzerland, and Japan. (author)

  10. Neutron beam research at BARC (India) and international collaboration

    Neutron beam research started in India more than four decades ago. Presently, the National Facility for Neutron Beam Research, NFNBR is located in Dhruva, a 100 MW research reactor. The entire facility, including the development of neutron detectors, is the result of indigenous efforts of the participating scientists from Bhabha Atomic Research Centre, BARC. NFNBR is accessible to national and international collaborations, and about forty research groups from various institutions have already availed this facility. Active collaboration with ISIS started since 1984, when the day-1 spectrometer, built at BARC, became operational at ISIS. The collaboration continued with the fabrication, at BARC, of parts for OSIRIS spectrometer. Many neutron beam researchers from BARC have carried out collaborative experiments using the neutron sources at USA, France, Germany, Switzerland, and Japan. (author)

  11. Advances in nuclear desalination in BARC

    As a part of our programme to improve the quality of life of our large population by systematic induction of nuclear energy, BARC has been engaged in R and D activities on desalination since 1970s. The desalination activities were part of a programme of setting up a number of demonstration plants for the energy intensive processes such as desalination of seawater, electrolytic production of hydrogen and electro thermal production of phosphorus. These activities are presently termed by IAEA as 'Non Electrical Application of Nuclear Energy'. Over a period of time, BARC has successfully developed desalination technologies based on multi-stage flash (MSF) evaporation, reverse osmosis (RO) and low temperature evaporation (LTE). In the field of thermal desalination, efforts are directed towards utilizing the low-grade heat and the waste heat as energy input for desalination. In membrane desalination, work is being carried out on newer pre-treatment methods such as use of ultra filtration, energy reduction and higher membrane life. Based on operational experience of MSF and RO plants at Trombay, BARC has undertaken establishment of the Nuclear Desalination Demonstration Project (NDDP), Kalpakkam. NDDP consists of a hybrid MSF-RO desalination plant of 6300 m3/d capacity (4500 m3/d MSF and 1800 m3/d Sea Water Reverse Osmosis (SWRO)) coupled to 2 x 170 MWe Pressurised Heavy Water Reactors (PHWRs) at MAPS, Kalpakkam. The requirements of seawater, steam and electrical power for the desalination plants are met from MAPS I and II which are around 1.5%, 1.0% and 0.5% of available at MAPS. The hybrid plant has provision for redundancy, utilization of streams from one to other and production of two qualities of products for their best utilization. The 1800 m3/d SWRO plant, which is already commissioned in August 2002, is designed to operate at relatively lower pressure (51.5 bar during 1st year and 54 bar during 3rd year) to save energy, employs lesser pre-treatment (because of

  12. Molecular laser isotope separation programme at BARC

    Little over thirty years ago, BARC ventured into a new frontier of scientific research: Molecular Laser Isotope Separation (MLIS) programme based on the interaction of lasers with molecules. The initial project was a scheme to produce enriched uranium. The idea was to use the intense, monochromatic light of lasers to break the chemical bonds of only those molecules containing the fissionable isotope uranium-235. At present the programme is evolving around separation of low and middle mass isotopes, namely sulphur 34/33/32, oxygen 17/18, carbon 13/12, hydrogen T/D/H to be followed by an advanced engineering programme designed to lead to a demonstration plant. The latest results have come very close to the design parameters specified for a full-scale separation of carbon isotopes. All these expertise provide an infra structure for future front line R and D activities in the general area of Laser Photochemical Technology which would include i) LIS of other useful elements ii) Material processing and iii) Fuel reprocessing/ waste management (author)

  13. Popularization of groundnut varieties through BARC-UASD collaboration

    To boost the productivity of groundnut, farmers need to have an access to improved seeds of the right variety, at the right time, at the right place, at an affordable price. The awareness and benefits of the improved varieties and quality seeds of groundnut was carried out by carefully planned co-ordinated educational systems such as field trials, demonstrations, field days, training farmers, interface meetings through the well established network of the University and mass media promotional tools. The BARC-UASD collaboration led to the popularization of BARC groundnut varieties like TAG-24, TG-26, TPG-41 and TDG-39 among the farming community of north Karnataka. (author)

  14. Investigation of UFO defect on DUV CAR and BARC process

    Yet, Siew Ing; Ko, Bong Sang; Lee, Soo Man; May, Mike


    Photo process defect reduction is one of the most important factors to improve the process stability and yield in sub-0.18um DUV process. In this paper, a new approach to minimize the Deep-UV (DUV) Chemically Amplified Resist (CAR) and Bottom Anti-Reflective Coating (BARC) induced defect known as UFO (UnidentiFied Object) defect will be introduced. These defects have mild surface topography difference on BARC; it only exists on the wide exposed area where there is no photoresist pattern. In this test, Nikon KrF Stepper & Scanner and TEL Clean track were used. Investigation was carried out on the defect formulation on both Acetal and ESCAP type of photoresist while elemental analysis was done by Atomic Force Microscope (AFM) & Auger Electron Spectroscopy (AES). Result indicated that both BARC and photoresist induce this UFO defect; total defect quantity is related with Post Exposure Bake (PEB) condition. Based on the elemental analysis and process-split test, we can conclude that this defect is caused by lack of acid amount and low diffusivity which is related to PAG (Photo Acid Generator) and TAG (Thermal Acid Generator) in KrF photoresist and BARC material. By optimizing photoresist bake condition, this UFO defect as well as other related defect such as Satellite defect could be eliminated.

  15. Conceptualization and development of a helium liquefier at BARC, Mumbai

    Indigenous development of helium liquefiers is regarded as a high priority area at BARC, Mumbai. A precooled Collin's cycle based helium liquefier conceived to work between pressure limits of 0.105 and 1.3 MPa (a) and with mass flow rate of 62 g/s is reported in the present paper. The system is designed to achieve a liquefaction rate of about 57 l/hr with the lowest temperature as 4.86 K. Effect of different heat exchanger effectiveness and turbine efficiency values on the liquefier performance has also been theoretically studied and reported here. Design and development methodology of the liquefier cold box has been dealt with. The present paper also describes the current state of installation and commissioning activities of the above described helium liquefier at BARC, Mumbai. First trial runs are expected soon after the completion of the transferline circuit from the liquefier cold box to the liquid helium receiver vessel. (author)

  16. Status report on the folded tandem ion accelerator at BARC

    P Singh; S K Gupta; M J Kansara; A Agarwal; S Santra; Rajesh Kumar; A Basu; P Sapna; S P Sarode; N B V Subrahmanyam; J P Bhatt; P J Raut; S S Pol; P V Bhagwat; S Kailas; B K Jain


    The folded tandem ion accelerator (FOTIA) facility set up at BARC has become operational. At present, it is used for elemental analysis studies using the Rutherford backscattering technique. The beams of 1H, 7Li, 12C, 16O and 19F have been accelerated up to terminal voltages of about 3 MV and are available for experiments. The terminal voltage is stable within ± 2 kV. In this paper, present status of the FOTIA and future plans are discussed.

  17. Bhabha Atomic Research Centre (BARC) annual report 1985-86

    The research and development (R and D) activities and accomplishments during the financial year 1985-86 of the Bhabha Atomic Research Centre, Bombay are reported. The BARC is a multidisciplinary laboratory engaged in R and D activities in the field of nuclear energy. The main thrust of the R and D activities of the Centre is aimed at: (1) achieving targets of India's nuclear power programme, (2) indigenisation of the various steps in the nuclear fuel cycle, (3) developing and propagating peaceful applications of nuclear science and technology in the country in fields such as agriculture, medicine and industry, (4) providing scientific support to regulatory functions associated with nuclear facilities and radiation protection activities in the country. The salient features of these R and D activities are described in the chapters entitled: (1) physical sciences, (2) chemical sciences, (3) materials and materials sciences, (4) life sciences, (5) radioisotopes, (6) reactors, (7) fuel cycle, (8) health and safety, (9) electronics and instrumentation, and (10) technical services. A list of publications by the staff-members during the report period is given at the end of each chapter. The R and D activities of the outstation units of BARC, namely, Nuclear Research Laboratory at Srinagar, High Altitude Research Laboratory at Gulmarg, Variable Energy Cyclotron Centre at Calcutta and Gauribidanur Seismic Array near Bangalore are also covered in the report. Other activities of the Centre include technology transfer and manpower training which are also described briefly. (M.G.B.)

  18. Solid-state RF power amplifiers development at BARC

    The paper presents the recent developments on solid- RF power amplifiers (SSRFPA) at Bhabha Atomic Research Centre (BARC). Recent developments on solid-state RF power amplifier modules using LDMOS devices higher power output (>800) per module, high power gain (∼20 dB), and moderate DC to RF conversion efficiency (>65%). RF power combiners at various outputs (1-10 kW) at arbitrary input ports have developed. Integral power amplifiers at 325 and 352 MHz have been designed for 1, 3, 5 and 7 kW output. It also includes the 270 W, 352 MHz driver of 1 MW klystron based high power RF system. This SSRFPA has power gain of 22 dB and drain efficiency of 63%. Another RF generator of 300 W, 100 MHz has been specifically developed for RF ion-source of 14 MeV generator. The RF generator has 71 % efficiency. The paper presents details and test results of all the SSRFPA developments. (author)

  19. Status of solid-state power amplifiers development in BARC

    Various solid-state power amplifiers have been developed to meet the requirements of accelerator needs for BARC and its collaboration projects. These are mainly 352 and 325 MHz RF power amplifiers. The 352 MHz, RF power amplifier have been developed to feed the buncher cavity of the Low Energy High Intensity Proton Accelerator (LEHIPA). Whereas 325 MHz 3 kW and 7 kW solid- state power amplifiers have been designed under the IIFC-Fermilab collaboration. The same technologies will also be used for 200 MeV superconducting accelerator of ADS program. The paper present the technology details of the power amplifier modules, power combiners, dividers and sensors etc. The developed SSPAs are of 3 kW, 325 MHz and 10 kW 352 MHz. Both the power amplifiers have been tested on a 50 ohm load. The 3 kW SSPA has the drain efficiency of 65.3%. The four modules have the power output of 850 W each. This SSPA has the figure of merit of SSPAs (number of modules per kW) is 1.2. The 10 kW SSPA is mainly required to feed the buncher cavity of the LEHIPA. It is combination of 16 power modules of 800 W each at 352 MHz. (author)

  20. Ceramic nuclear fuels development at BARC - recent activities

    The ceramic nuclear fuels activities at Bhabha Atomic Research Centre (BARC) in recent years have been in the following areas: - improvisation of process flowsheet for economic and efficient production of high density UO2 fuel pellets on industrial scale for pressurised heavy water reactors (PHWR), - fabrication, thermophysical property evaluation and irradiation-testing of (U, Pu)O2, (Th, Pu)O2 and (Th, U)O2 fuels for PHWRs, - fabrication and thermophysical property evaluation of (U, Pu)O2, (U, Pu)C and (U, Pu)N fueld pellets for liquid metal cooled fast breeder reactors (LMFBR). The conventional ''powder-pellet'' and the advanced ''sol-gel microsphere pelletisation'' (SGMP) processes have been optimised for fabrication of oxide, carbide and nitride fuel pellets of controlled density and microstructure. The SGMP route is dust-free and is ideally suitable for remote fabrication of highly radiotoxic Pu and Pu233 bearing ceramic fuels. For fabrication of UO2 and (U, Pu)O2 pellets, a process combining SGMP and low temperature oxidative sintering has been developed for minimising radioactive dust hazard and energy requirement during sintering. The thermal conductivity (laser flash method) and hot hardness (using Vickers diamond indentor) of oxide, carbide and nitride fuel pellets were evaluated upto 1800 K and 1500 K respectively. The out-of-pile experiments on chemical compatibility of mixed uranium plutonium monocarbide and mononitride fuel pellets with stainless steel (type SS 316) cladding have been carried out to find their suitability as fueld for fast breeder test reactor (FBTR) and prototype fast breeder reactors (PFBR) at Indira Gandhi Centre for Atomic Research (IGCAR) at Kalpakkam. (orig.)

  1. Control and monitoring of EXAFS beamline of Indus-2 at RRCAT remotely from BARC

    EXAFS Beam line of Indus-2 is being operated and managed by Spectroscopy Division, BARC. Experimental setup in Indus-2 experimental hall is required to be monitored and operated when beam is available at Indus-2. To facilitate remote monitoring and control of the experimental setup from BARC, necessary networking infrastructure has been commissioned. The setup is based on client-server architecture and is using LabView software as the application development tool. Vacuum is controlled and monitored remotely from BARC and data acquisition done at RRCAT for various parameters is transmitted to the other end. This is a unique application practically deployed on ANUNET. For providing dedicated, secured, reliable, high speed connectivity various options were explored. It was decided to use ANUNET network for this purpose. ANUNET is a DAE wide network connecting various units of DAE either by satellite based links or by leased links. Dedicated leased connectivity has been established between Spectroscopy Division, BARC and EXAFS Beam line, Indus-2. The connectivity does not intermix with the campus LANs of RRCAT and BARC, thus providing physical isolation, but at the same time addresses the user's requirement. IT security guidelines of the two units are also not compromised. (author)

  2. Observation of neutrons and tritium in the early BARC cold fusion experiments

    Soon after the Fleischmann-Pons announcement of 1989, a number of groups at the Bhabha Atomic Research Centre (BARC), Mumbai independently set up experiments to confirm if nuclear products such as neutrons and tritium are generated when samples of Pd and Ti metal are loaded with deuterium, using both electrolytic as well as gas/plasma-based loading techniques. Twelve independent research groups involving about 50 scientists were engaged in this massive effort during 1989-95, before institutional support for research on this topic was withdrawn, emulating global trends. This article briefly summarizes the results obtained during those early BARC studies. (author)

  3. Overview of slow positron beam based research in BARC

    Energy distributed positrons emitted from the beta decay of radioisotopes provide averaged information about the bulk of the sample. With the advent of slow positron beams, it has become possible to monoenergize positrons emitted from the radioisotope sources and probe surfaces, buried interfaces and multilayer structures. The positron emitted from the source are made to thermalize and transported to the sample as a monochromatic beam with the help of electric and magnetic field assemblies to carry out depth dependent studies. The slow positron beam at Radiochemistry Division, BARC is currently being utilized for depth profile studies in organic semiconductor (OSC) thin films and defect structure in metallic samples. In addition, pore architecture in membranes referring to pore interconnectivities have been addressed. The present talk entails studies on nanoscale organics and touches upon the utility of positron beam technique to address pore architecture. Single and multilayer nanoscale films of metal phthalocyanines (MPc) have been studied to probe buried interfaces and nanostructural variations as a function of different growth parameters. The sensitivity of positron to defects helped in identifying structural disorder resulting due to the heteroepitaxy between different materials. The ability to control the depth of penetration has helped to probe buried interfaces in these organic heterostructures. The positron diffusion length is derived from the Doppler broadening profiles (S-E) arid compared with charge carrier mobility in OSCs. Effect of post deposition annealing temperature on the nanostructure of MPc thin films has also been studied. The S-E profile together with S-W correlation helped in identifying nanostructural inhomogeneities in the film. In another study, the defect structure at the interface of OSC and the dielectric substrate has been examined for the films grown on SiO2/Si substrates, unmodified and modified, as the case may be, using self

  4. Research on refractory, reactive and rare metals in BARC

    -metallics for specific applications. The presentation will essentially attempt to give an account of the development of refractory, reactive and rare metals in BARC over the period of nearly fifty years. (author)

  5. Over-expression, Rapid Preparation and Some Properties of C-terminal BARc Region in PICK1

    Junhua Wang


    Full Text Available A DNA fragment encoding C-terminal BARc region (amino acids 128-416 of rat PICK1 (NP_445912 was inserted into a modified vector pMAL-s involving human rhinovirus 3C protease cleavage site to produce a recombinant plasmid, pMAL-s-barc. The construct can express the fusion protein, MBP-BARc in the soluble form in E.coli. To remove the MBP tag, MBP-BARc purified from amylose beads was digested with human rhinovirus 3C protease and the cleavage efficiency is about 95% when the ratio of protein / enzyme (w/w reaches 50:1, as analyzed on SDS-PAGE. The enzymatic reaction mixture was rapidly separated into two parts, MBP in the supernatant and BARc in the precipitate at the concentration of 1 M ammonium sulfate. In such case, the target protein BARc could be economically produced in a soluble state to be as the sample for measuring its biochemical function, for example, protein-protein interaction and protein-lipid combination.

  6. Multi axis motor control system for BARC-TIFR LINAC scattering chamber

    A general purpose scattering chamber of 150 cm diameter and 50 cm height is recently installed at BARC-TIFR LINAC facility. Scattering chamber is used in several experiments using particle accelerators. A remote controlled system is developed to perform various operation in scattering chamber. Four servo motors with PLC interface have been used to meet the precise positioning of target and detectors in scattering chamber. User interface software has been developed in Java which interacts with the system over Ethernet

  7. Short term course on Particle Accelerator Facilities in BARC: lecture notes

    This course will focus on the working principles of different types of accelerators and the safety and regulatory aspects of the particle accelerators in BARC. We sincerely hope that the course will benefit all those involved in the design, operation, maintenance as well as regulation of the particle accelerators. The course will bring together all the stakeholders on a common platform to understand and communicate various aspects of particle accelerators. Papers relevant to INIS are indexed separately

  8. Installation and commissioning of Scandiflash-450 flash X-ray generator at BARC, Visakhapatnam

    Energetics and Electromagnetics Division, BARC, Visakhapatnam has possessed a Flash X-ray radiography (FXR) system, make: Scandiflash, Sweden. This installation and commissioning of the system has been done by ourselves. Few problems have been detected during installation and commissioning. The troubleshooting of the system has been done. Somewhere we needed to replace the original components by indigenously made one. The complete installation and commissioning has been reportedly as far as detailed possible. Presently the system is working with satisfaction. The installed facility is being used as one of the primary means of diagnostics in many of the ongoing experiments. (author)

  9. Evaluation of thermophysical and thermomechanical properties of aluminium matrix dispersion fuels at BARC

    Al-U alloy and Al-UAIx, Al-U3O8 and Al-U3Si2 composites are being extensively used all over the world as fuel for small, water-cooled, non-power research reactors. As part of 40 kWt KAMINI and 5 MWt and 10 MWt research reactor fuels development programme at Bhabha Atomic Research Centre (BARC), Bombay, out-of-pile properties of these fuels, namely, hot hardness, high temperature microstructure and thermal conductivity were evaluated in the temperature range of 300-900K. (author)

  10. Proceedings of the national symposium on BARC technologies for development of rural India

    For empowering Indian villages, science and technology (S and T) based eco-friendly work plan have to be evolved. Sustainable techno-economic growth of rural sector in a country of vast size such as India requires technology innovations and their ingenious adaptation. This can be achieved to a great extent by adopting such technologies for varied local conditions so that it can be applied quickly to enhance the quality of life of larger population. Considering the wealth of technology and innovative capability generated in BARC, as an off-shoot of R and D in nuclear energy and its applications in power and non-power areas, Department of Atomic Energy (DAE), India has launched - Societal Initiative for utilization of Non-Power Applications (NPAs) and Spin off technologies (Spin-offs) in the area of water, land, agriculture, food processing and urban-rural waste management. Within this framework of societal initiative, structured programme called 'AKRUTI - KRUTIK - FORCE' has been formulated and is being implemented by BARC for techno-economic growth of the rural sector, as one of the many schemes for large-scale deployment of NPAs and spin-offs. This symposium consisting of invited lectures and poster presentations covered the topics like food and agriculture, health and environment, energy and conservation. Papers relevant to INIS are indexed separately

  11. Indigenous development and performance evaluation of BARC aerodynamic size separator (BASS)

    Singh, S; Khan, A; Mayya, Y S; Narayanan, K P; Purwar, R C; Sapra, B K; Sunny, F


    Commercially available cascade impactors, commonly used for aerodynamic size separation of aerosol particles, are based on the principle of inertial impaction. As of now, these instruments are imported at a cost of several lakhs of rupees; hence an effort has been made to develop an aerodynamic particle sizer indigenously in BARC. This unit, referred to as BARC Aerodynamic Size Separator (BASS), separates aerosols into seven size classes ranging from 0.53 mu m to 10 mu m and operates at a flow rate of 45 Ipm. Intercomparison studies between the standard Andersen Mark-II (Grasbey Andersen Inc.) impactor and BASS using nebulizer generated aerosols have consistently shown excellent performance by BASS in all respects. In particular, BASS yielded the parameters of polydisperse aerosols quite accurately. Experiments to evaluate the individual stage cut-off diameters show that these are within 8% of their designed value for all stages except the higher two stages which indicate about 30% lower values than the desig...

  12. Variation of outdoor radon levels and gamma radiation with respect to meteorological parameter at BARC, Vizag

    Hourly outdoor radon concentration along with meteorological parameters were measured at eight locations in and around BARC, Vizag using radon monitoring system (Alpha Guard, Genitron make). The geometric means of outdoor radon levels were found to be in the range of 4-22 Bqm-3. The diurnal variation of outdoor radon concentration observed at each location indicates a possible dependence on the meteorological parameters. A build up of 2-16 fold is observed in early morning hours in outdoor radon concentration. The radon concentration is found to increase with increase in relative humidity. The radon concentration was also found to be inversely related to the atmospheric temperature with minimum radon concentration during afternoon hours, when the temperature was maximum. Similarly maximum radon concentration was observed in the early morning hours, when the temperature was minimum. Gamma radiation levels were also measured at eight locations in and around BARC, Vizag. The arithmetic means of gamma radiation observed in these locations were found to vary from 139-266 nGyh-1. The gamma radiation levels observed these locations were found to be independent of temperature and humidity for the measurement period of this study. (author)

  13. Fabrication experience of aluminium clad aluminium matrix dispersion fuels at BARC

    Aluminium clad, aluminium matrix plate type dispersion fuels have been fabricated in BARC in recent years as part of fuel development programme for small non-power research reactors. The present paper describes the flowsheet developed for fabrication of Al-UAlx, Al-U3Si2 and Al-U3O8 fuels at BARC. The Al-20% U alloy fuel for KAMINI neutron radiography reactor was prepared by 'melting and casting' route, followed by picture framing and roll-bonding. For higher 'U' density fuels namely, Al-UAlx, Al-U3O8 and Al-U3Si2 the 'powder metallurgy' route was followed for preparation of fuel meat. The novel features in fabrication route were: addition of Zr for stabilizing UAl3 phase in Al-20% U alloy; x-ray radiography and microdensitometric scanning of radiographs for location of fuel outline inside fuel element and for confirming homogeneous distribution of fissile atoms; immersion ultrasonic testing for confirming good bonding between mating Al surface of the fuel plate. (author)

  14. Status report on LEHIPA beam trial through 2 segments of RFQ at BARC

    A 20 MeV, 30 mA, Low Energy High Intensity Protons Accelerator (LEHIPA) is under installation and commissioning at BARC. The 50 keV proton beam from Electron Cyclotron Resonance (ECR) source has been transported through Low Energy Beam Transport (LEBT) system and accelerated through 2 segments of Radio Frequency Quadrupole (RFQ) to 1.2 MeV. Installation of Sub Systems like Vacuum System, RHVPS, High Power RF system, LLRF system, Control and Instrumentation and safety interlock is completed. Two more segments of RFQ are expected very soon. This talk will cover report of progress made on all sub systems and results of beam trial will be presented. (author)

  15. Design of a new controller for vacuum interlock system at BARC-TIFR Pelletron Accelerator Facility

    The BARC-TIFR Pelletron Accelerator Facility has been operational for last twenty two years with progressively increased efficiency. The entire beam transport line is maintained under ultra high vacuum (UHV), Turbo Pumps, Getter and Ion Pumps are being used to maintain UHV in beam transport line. Safety of the pumps is ensured by interlocking operation of gate valves with the safe vacuum level. A new type of controller has been designed using CMOS ICs' for vacuum interlock system. Three pneumatically controlled UHV gate valves can be operated from this unit. This unit is interfaced with a multi cold cathode controller (Pfeiffer make) unit and accordingly generates signal to operate three gate valves. This paper presents the design features of the controller and its utilization. (author)

  16. Proceedings of the national symposium on BARC technologies for development of rural India

    Empowering villages with Science and Technology (S and T) based on eco-friendly work plan for sustainable Techno-Economic growth of rural sector in a country of vast size, technology innovations and adaptations have to be evolved. This can be achieved to a great measure particularly since such technology will fit with varied local conditions and can be applied quickly to enhance the quality of life of larger population. Considering the wealth of technology and innovative capability generated in BARC, as an off-shoot of R and D in Nuclear Energy and its applications in power and non-power areas, Department of Atomic Energy (DAE) has launched - Societal Initiative for utilization of Non-Power Applications (NPAs) and Spinoff technologies (Spinoffs) in the area of water, land, agriculture, food processing and urban-rural waste management. Within this framework of societal initiative, structured programme called 'AKRUTI - KRUTIK - FORCE' has been formulated and is being implemented by BARC for techno-economic growth of the rural sector, as one of the many schemes for large-scale deployment of NPAs and spinoffs. Bhabha Atomic Research Centre Officer's Association (BARCOA) is making a maiden attempt to hold a symposium where the scientists, technologists, agriculturists and the consumers will come on a common platform to discuss these issues. This symposium is organized to enable to take the fruits of technology to grass-root level to every villager in the remote corner and provide inclusive growth to the rural sector and tap the hidden innovative capability of large rural India. This symposium describes the various technologies developed indigenously by Bhabha Atomic Research Centre for the development of rural India. Papers relevant to INIS are indexed separately

  17. Indigenous development and performance evaluation of BARC aerodynamic size separator (BASS)

    Commercially available cascade impactors, commonly used for aerodynamic size separation of aerosol particles, are based on the principle of inertial impaction. As of now, these instruments are imported at a cost of several lakhs of rupees; hence an effort has been made to develop an aerodynamic particle sizer indigenously in BARC. This unit, referred to as BARC Aerodynamic Size Separator (BASS), separates aerosols into seven size classes ranging from 0.53 μm to 10 μm and operates at a flow rate of 45 Ipm. Intercomparison studies between the standard Andersen Mark-II (Grasbey Andersen Inc.) impactor and BASS using nebulizer generated aerosols have consistently shown excellent performance by BASS in all respects. In particular, BASS yielded the parameters of polydisperse aerosols quite accurately. Experiments to evaluate the individual stage cut-off diameters show that these are within 8% of their designed value for all stages except the higher two stages which indicate about 30% lower values than the designed ones. The replotting of all the mass distribution data using the experimental cut-off diameters showed perfect lognormal fits, thereby indicating that these diameters are closer to the true stage cut-off diameters for BASS. The studies show that BASS will be suitable for determining the particle size distributions in the context of the radiological safety programmes of DAE. Being indigenous in design, it may be fabricated on a commercial scale at a cost far less than that of the imported units. Such a venture will greatly help several national programmes on atmospheric pollution being carried out by many laboratories and institutions across the country. (author)

  18. Status report of 6 MV FOTIA and LEAF accelerators at BARC

    Two Accelerators, i.e. 6 MV Folded Tandem Ion Accelerator (FOTIA) facility and A Low Energy Accelerating Facility (LEAF) are operational at Ion Accelerator Development Division, BARC. The accelerated beams of both light and heavy ions from these facilities are being used extensively by various divisions of BARC, Universities, lIT Bombay and other R and D labs across the country for basic and applied research. The ion beam are being used for multi elemental analysis by PIXE and PIOE techniques, irradiation damage studies on structural material and live biological cells. LEAF employs the versatile SNICS-II (Source of Negative Ion by Cesium Sputtering) ion source and mass selection is done by a 90 degree magnet, which has a mass energy product of 66 MeV. This facility can deliver single negative ion beams of energy upto 50 keV. Negative ion beams of H-, Li-, C-, O-, Al-, Fe-, F-, Si-, S-, P-, Sb, Ag- and Au- beams has been extracted. Various Experiments have been done with H-, Li-, C-, Si-, S-, P- and Sb- beams. Typical particle currents available from this facility are few micro amperes. This facility is extensively used for H- ion implantation on lnAs/GaAs quantum dots at various energies between 50 keV to 20 keV, ion implantation on semiconductors and study on effect of irradiation effect over quantum dots for infrared photodetectors (QDIPs) and solar cell application and for testing of LEHIPA diagnostic devices and control software. Network based control system of this accelerator is used, apart from normal control operation, to auto start up and shutdown the accelerator and it is successfully working last few years. This paper will present the status report of FOTIA and LEAF with details and salient features of the facility, its applications and utilization. (author)

  19. Meteorological analysis of very severe cyclonic storm Hudhud in and around BARC-Visakhapatnam in October 2014

    Meteorological features of 'Hudhud' for the active period October 11-13, 2014 monitored at BARC, Visakhapatnam site have been analyzed. Response from observatories and behavior of the rare event of a cyclone which crossed through Visakhapatnam is presented and discussed for information and record. This will be a useful input in planning and designing the safety features in the developmental activities proposed at this site. (author)

  20. Distributed vacuum system for 20 MeV, 30 mA LEHIPA project at BARC

    The 20 MeV, 30 mA LEHIPA Project is at advance stage of commissioning at BARC, where high intensity proton beam will traverse about 30 meter through the LINAC accelerating structure, associated beam diagnostic and focusing elements. An average vacuum of the order of 10-7-10-8 Torr will be maintained for high beam transmission and minimum beam energy spreads. This is essential to minimize scattering of accelerated beam particles by the molecules of residual gases. The scattered particles result in loss of beam current, heating of structural surfaces, and at higher energies it causes activation of accelerator parts due to reactions. Except for the initial path of protons (H+ ions) near the ECR ion source where the plasma is formed inside the chamber at about 10-3 Torr hydrogen gas pressure, the vacuum system should meet the above requirement throughout the accelerator length. The vacuum system is divided in four sections where gas load and average vacuum levels are different based on the gas load. (author)

  1. Setup for thin layer activation at BARC-TIFR Pelletron Accelerator Facility

    Layout of drift space above analysing magnet of BARC-TIFR Pelletron accelerator facility was modified in year 2003 to accommodate an irradiation setup in tower area known as 6M irradiation setup. Proton beam of a few MeV energy having current in range of hundreds of nA can be obtained at this port to carry out specific experiments. Irradiation setup was modified to mount metal samples of different shape and sizes to study wear and corrosion rates using thin layer activation analysis technique. Special jigs were fabricated to irradiate samples i.e. disc gears, balls and rectangular shape coupons. The samples were irradiated by a proton beam of 13 MeV energy having 200 nA beam current. The irradiation resulted in production of a gamma emitting radionuclide Cobalt-56 (half- life:77.3 d, Energy: 847 KeV, 1.24 MeV) by the nuclear reaction 56Fe (p, n) 56Co. The irradiated samples were subjected to wear/corrosion environment under certain experimental conditions and activity loss was monitored periodically using gamma spectrometer. The reduced activity was correlated with thickness loss by generating a calibration curve. Details of setup and activation results will be presented in paper. (author)

  2. Detection of radioactive material in public places: BARC's handheld tele radionuclide detector

    Electronics Division, BARC has developed a compact and portable system for detection of radioactive nuclides like 60Co, 137Cs etc. with high levels of radioactivity. These radioactive sources, because of their long life and relative ease of availability, have the potential of being used in radiological dispersion devices (dirty bombs) for panic creation in public places. The unit comprises of a compact CsI detector, photo diode and front-end electronics, micro-controller, a GPS module and Blue-tooth connectivity. The application software running on the mobile phone provides the interface as well as transmission of data to remote server. This is highly suitable for covert operations. The person, who carries this instrument, suitably camouflaged, also has a mobile phone in his pocket, which is connected to the system via blue tooth. On detection of activity above set limit, the system sends an alarm to the mobile phone. The mobile phone can be kept in vibration mode in order to avoid any undue attention. The graphical display on screen of mobile phone provides an indication of activity and the isotope identification. Simultaneously, the mobile phone sends information about the activity detected and source identification automatically along with the location of the instrument (longitude and latitude), provided by the GPS module in the instrument, to a remote server. The remote server provides radiation information on a map with position-coordinates. Based on this, necessary action can be initiated by the security personnel. (author)

  3. Comparison of aerosol inhalation lung images using BARC and other nebulizers

    Various factors determine the site of inhaled aerosol deposition in the lungs. They are the size of aerosol the composition of carrier gas of the aerosol, the airflow rate, physico-chemical properties of the carrier gas or the aerosol, the shape and structure of the airways, and the body position during inhalation. Aerosol inhalation lung images were obtained in the same subjects using 99mTc-human serum albumin aerosol generated by 3 different aerosol generators each producing different-sized aerosol and 2 or 3 days apart from each study. The size of aerosol produced by an ultrasonic nebulizer (Mistogen) was 1.93 Micron in activity median aerodynamic diameter (AMAD) with its geometric standard deviation (σg) of 1.73, that by a jet nebulizer (Ultra Vent) was 1.04 micron in AMAD with its σg of 1.71, and that by our BARC nebulizer, a type of a jet nebulizer, was 0.84 micron in AMAD with its σg of 1.73. In addition Technegas was also applied to selected patients. The latter produced aerosol of less than 0.2 micron in size at the largest and the majority, say, 95% or more of the generated aerosol was less than 0.1 micron in size by electron Microscopy. Each subject inhaled aerosol in resting tidal breathing through a mouth-piece with a one way double J valve with the nose clipped in the sitting position. After inhaling approximately 2-3 mCi (74 to 111 MBq) in the thorax, four view lung images were taken: anterior, posterior, and right and left laterals. 300 K counts per view were collected. They were not only pictured on polaroid films as analogue data but also recorded and stored in a computer as digital data. In case of Technegas breathing it for the RV (residual volume) to the TLC (total lung capacity) level followed by breath-holding for 5 to 10 sec in duration was repeated 2 to 3 times as a breathing maneuver instead of tidal breathing. Otherwise deposition efficiency of Technegas is very little because of the small size of the Technegas. Representative 10 cases

  4. High voltage technologies for radio frequency (RF) systems of proton accelerators in BARC

    Accelerators were invented to provide energetic particles to investigate the structure of the atomic nucleus. They speed up and increase the energy of a beam of particles by generating electric fields that accelerate the particles and magnetic fields that steer and focus them. An RF accelerator uses electromagnetic fields to propel charged particles to high speeds and to contain them in well-defined beams. The RF power amplifier, which provides electromagnetic fields, converts direct current (D.C.) input power into r.f. output power. The accelerating structures use this r.f. power to accelerate low-charge bunches to high energies. An important program of Department of Atomic Energy is to build accelerator driven sub critical reactor system (ADS). In ADS, high energy proton beam (from the CW particle accelerator, 1 GeV, > 20 mA) strikes a heavy element target which yields copious neutrons by (p, xn) spallation reaction inside a sub-critical core. One of the critical components of ADS is a 1 GeV, high current proton accelerator. It is being built in three phases. In the first phase, a 20 MeV, 30 mA, low energy high intensity proton accelerator (LEHIPA) is under construction at BARC. It requires radio frequency (RF) power for beam acceleration and is provided by high power RF systems. The RF systems require and use high voltage DC technologies (at 100 kV and 65 kV) as their subsystems that are developed with the help of local Indian industries. These technologies are making use of innovative techniques, new insulating materials and new technologies to avoid the critical problems (associated with high voltages) like arcing, sparking, energy deposition under arcing etc. This poster will describe in detail these high voltage technologies developed with the help of local Indian industries. (author)

  5. Distributed UHV system for the folded tandem ion accelerator facility at BARC

    The 6 MV Folded Tandem Ion Accelerator (FOTIA) Facility at the Nuclear Physics Division, BARC is operational and accelerated beams of both light and heavy ions are being used extensively for basic and applied research. An average vacuum of the order of 10-8-10-9 Torr is maintained for maximum beam transmission and minimum beam energy spreads. The FOTIA vacuum system comprises of about 55 meter long, 100 mm diameter beam lines including various diagnostic devices, two accelerating tubes and four narrow vacuum chambers. The cross sections of the vacuum chambers are 14mm x 24mm for 180 deg., 38mm x 60mm and 19 x 44 mm for the and 70 deg. and 90 deg. bending magnets and Switching chambers respectively. All the beam line components are UHV compatible, fabricated from stainless steel 304L grade material fitted with metal gaskets. The total volume ∼5.8 x 105 cm3 and surface area of 4.6 x 104 cm2, interspersed with total 18 pumping stations. The accelerating tubes are subjected to very high voltage gradient, 20.4 kV/cm, which requires a hydrocarbon free and clean vacuum for smooth operation of the accelerator. Vacuum interlocks are provided to various devices for safe operation of the accelerator. Specially designed sputter ion pumps for higher environmental pressure of 8 atmospheres are used to pump the accelerating tubes and the vacuum chamber for the 180 deg. bending magnet. Fast acting valves are provided for isolating main accelerator against accidental air rush from rest of the beam lines. All the vacuum readings are displayed locally and are also available remotely through computer interface to the Control Room. Vacuum system details are described in this paper

  6. Modification in existing SF6 gas handling system at 14UD BARC-TIFR Pelletron Accelerator, Mumbai

    BARC-TIFR 14 UD Pelletron Accelerator facility at TIFR, Mumbai is operational since inception 1989. The accelerator is housed inside a pressure vessel of 6 metre diameter, 25 metre long and 525m3 volume. The accelerator tank is pressurized with SF6 at 80 to 100 psig in order to achieve 14MV. The inventory of SF6 gas is about 18,000 Kg (approximately) at 80 psig. SF6 gas can be transported from Accelerator tank to storage tank using gas handling system, which consists of oil free compressor, vacuum pump, dust filters, oil filters, dryers etc

  7. Electron beam accelerator at BARC-BRIT complex - electron beam processing of materials and industrial utilization

    During the last decade, the 2MeV/20kW electron beam (EB) accelerator located at BARC-BRIT complex, Vashi has been successfully utilised for non-thermal applications to develop speciality products useful for the industry. Polymer materials are exposed to high energy electrons to induce crosslinking and degradation reactions in a number of industrial products without the use of external chemicals and additives. Various EB crosslinked products viz. PE O-rings, automotive components, automobile tyres, electrical insulations, etc have been found to be much superior in quality compared to those produced conventionally. A process has been developed to enhance colours in the polished diamonds and gem stones using EB irradiation at the facility which has attracted much attention in the Indian diamond industry as a value-addition process. Recycling of polymer waste processed under EB to produce microfine PTFE powder, to reuse in automobile industry etc. has shown good potential for the industrial use. The process feasibility both in terms of economics and technology have been amply demonstrated on a technological scale by installing special conveyors at our facility for irradiating various industrial products. Around 100 km cable insulations, 1.5 million PE O-rings and more than 40000 carats of polished diamonds have been processed in our facility over a period of time on commercial scale. Encouraged with the results, Indian private entrepreneurs have set up dedicated EB machines in some of the most significant industries producing wire and cables, electrical gadgets based on polymer composites, automobile tyres and diamonds. The products are unique in properties and are in some cases, became import substitutes. The industry is now fully geared up to adapt the technology by realising the advantages viz ease in adaptability, convenient, safe and environmental-friendly nature. Encouraged by the process demonstrations, while five EB accelerators were setup and are in operation

  8. Development of Radiopharmaceuticals Based on 188Re and 90Y for Radionuclide Therapy at BARC. Chapter 6

    During the last decade, the group at Bhabha Atomic Research Centre (BARC), India, has focused attention on the development of 90Y based radiopharmaceuticals for therapy. Because the 90Sr/90Y generator is the primary source of high specific activity 90Y, local availability of the generator is crucial in the successful development of 90Y radiopharmaceuticals. In this context, 90Sr/90Y generators based on SLM and electrochemical techniques were designed and deployed at BARC for the elution of 90Y to be used for preparation of 90Y labelled products. This work formed a part of the IAEA CRP entitled Development of Generator Technologies for Therapeutic Radionuclides: 90Y and 188Re. In this chapter, work on the development of 90Y labelled products for treatment of NHL and liver cancer is reported. In addition, validation of the EPC technique for determination of 90Sr contamination in 90Y eluates and its comparison with the United States Pharmacopeia recommended method is presented. (author)

  9. BARC-35: A 35 group cross-section library with P3-anisotropic scattering matrices and resonance self-shielding factors

    A 35 group cross-section set with P3-anisotropic scattering matrices and resonance self-shielding factors has been generated from the basic ENDF/B-IV cross-section Library for 57 reactor elements. This library, called BARC35, is considered to be well suited for the neutronics and safety analysis of fission, fusion and hybrid systems. (author)

  10. BARC 2006 station report for NC-1004 national project on Genetic and Functional Genomic Approaches to Improve Production and Quality of Pork

    The NC-1004 national project assesses “Genetic and Functional Genomic Approaches to Improve Production and Quality of Pork.” This final NC-1004 station report summarizes the BARC lab’s recent research progress on the second objective: Discover genetic mechanisms controlling animal health in pork pro...

  11. Development of a compact 25-channel preamplifier module for Si-pad detectors of the BARC-CPDA

    The BARC Charged Particle Detector Array modules use indigenously developed Si pad detectors as their first element. Total number of charge sensitive pre-amplifiers required for the Si-pad detectors is 250. One of the main ideas here is a layout of five pre-amplifiers connected with one Si-pad detector (called a bank of preamplifiers). In the present work, a 25-channel pre-amplifier module that can cater to 5 independent Si-pad detectors, or a five-bank module, has been developed. This module uses pre-amp hybrid chips A1422H from CAEN S.p.A. and is housed in a double width NIM standard box. The module has been tested for performance using proton and ''7Li beams from FOTIA facility, Trombay

  12. Brachytherapy of intra ocular tumors using ′BARC I-125 Ocu-Prosta seeds′: An Indian experience

    Vikas Khetan


    Full Text Available Aim: To report our experience of brachytherapy using ′BARC I-125 Ocu-Prosta seeds′ for the management of intraocular tumors with regard to tumor control, globe preservation visual outcome, and patient survival at Sankara Nethralaya, Chennai, India between September 2003 and May 2011. Materials and Methods: We reviewed records of 35 eyes of 35 patients who underwent ophthalmic brachytherapy between September 2003 and May 2011. Twenty-one cases had choroidal melanoma, nine had childhood retinoblastoma, two had adult-onset retinoblastoma, and there were one case each of vasoproliferative tumor, retinal angioma, and ciliary body melanoma. Brachytherapy was administered using a 15- or 20-mm gold plaque with or without a notch. Brachytherapy was the primary treatment modality in all tumors other than retinoblastoma, wherein brachytherapy was done post chemoreduction for residual tumor. Results: For choroidal melanomas, the mean radiation dose was 68.69 ± 15.07 (range, 47.72-94.2 Gy. The eye salvage rate was 13/20 (65% and tumor control rate was 16/20 (80% at an average follow-up of 24.43 ± 24.75 (range, 1.5-87.98 months. For retinoblastoma, the mean dose was 45.85 ± 3.90 (range, 39.51-50.92 Gy. The eye salvage rate and tumor control rate was 5/6 (83.3% at an average follow-up of 38.36 ± 31.33 (range, 4.14-97.78 months. All eyes with retinoblastoma needed additional focal therapy for tumor control and eye salvage. Conclusion: The results of this retrospective study confirms that the use of ′BARC I-125 Ocu-Prosta seeds′ in episcleral plaques to treat intraocular tumors offers a viable option for the management of intraocular cancers.

  13. ZZ BARC-27GRP, 27-Group Infinitely Dilute and Bondarenko Cross-Section Library from ENDF/B

    1 - Description of problem or function: - BARC-27GRP: Format: 1-DX; Number of groups: 27; Nuclides: U-235, U-238, Pu-239, Pu-240, Pu-241, C, O, H, Al, Si, Na, Mg, Cr, Fe, Ni, Mo; Origin: ENDF/B-IV; Weighting spectrum: flux weighting proportional to 1/ΣT(u); fission weighting plus 1/E spectrum. - BARC-35-A: Format: SPHINX, Fx2-TH; Number of groups: 35; Nuclides: Al, He, Si, H, Fe, O, C, Na, Li, B, Be, N, Ca, Mn, V, Mo, Pb, Pu, Gd, K, Sm, Dy, Lu, Nb, U, Cr, Ni, Th, Np, Am, Zr, Cd, Eu, Mg, Ta, Cm, F, Ti, W. Origin: ENDF/B-IV; Weighting spectrum: fission - 1/E - thermal Maxwellian. - IAEA0856/01: 27-group resonance self-shielding factors and infinite diluted Cross sections for U-235, U-238, Pu-239, Pu-240, Pu-241, C, O, H, Al, Si, Na, Mg, Cr, Fe, Ni, Mo, generated by using the basic cross section and resonance parameter data from the ENDF/B-4 library. 2 - Method of solution: The 27-group constants were obtained by integrating the microscopic data over group intervals using a flux weighting proportional to 1/ΣT(u) and a fission plus 1/E spectrum. The standard ABBN group structure is used. The self-shielding factors were calculated for the following temperatures: 300, 900, 2100 (degrees Kelvin) and for potential scattering Cross sections of 10000, 100, 10, 1 barns. A thermal group is also included. For the 35-group library, resonance self-shielding factors are given at 300, 900, and 2100 K for a variety of dilution constants. Group Cross sections cover the energy range from 15 MeV to 0.005 eV and have been derived using Bondarenko flux approximation with a fission-1/E-thermal Maxwellian spectrum. The scattering Cross sections have been represented by a P3 Legendre expansion

  14. Development and utilization of various target assemblies for proton beam irradiation setup at 14 UD BARC-TIFR pelletron accelerator facility

    Drift space above analyzing magnet is modified to accommodate a proton beam setup at 6 meter level of 14UD BARC-TIFR Pelletron Accelerator Facility. This setup is capable of delivering proton beam in the energy range of 2 MeV to 26 MeV and current in μA range. The shielding at this level is such that radiation is within permissible limit when high proton beam current is accelerated. (author)

  15. Modified BARC nebulizer system for measuring mucociliary tracheal transport rate in smokers and in patients with chronic obstructive pulmonary disease

    A simple noninvasive method for in vivo monitoring of mucociliary tracheal transport rate (MTTR) is described. The technique is based on deposition of radioactive aerosols in the large airways of the lung and measuring their rate of movement as they are transported up the trachea. A technique for generating larger human serum albumin (HSA) radioaerosols, by using the BARC dry aerosol delivery system, is described. Qualitative data on bolus motion by cinescintigraphy and quantitative data for calculating the MTTR were obtained from a computer for 12 normal subjects, three asymptomatic smokers, four symptomatic smokers and 12 patients with chronic obstructive pulmonary disease (COPD). The mean MTTR was 4.11 + 0.84 mm/min in normals. Ten of the 12 COPD patients showed either a reduced MTTR or no motion of the boli. The motion as seen in cine mode was linear in all the 12 normals. Although MTTR in the remaining two patients with COPD was normal the bolus exhibited a spiral motion on cinescintigraphy. Asymptomatic smokers showed either reduced MTTR or spiral motion of the bolus, whereas all the symptomatic smokers showed reduced MTTR. It was observed that the movement of the boli in the symptomatic smokers and patients with COPD varied widely, showing, for example, regurgitation, spiral or axial motion, stasis and movement of the bolus from one bronchus to the other. (author). 17 refs, 3 figs, 2 tabs

  16. Design and construction of a target chamber and associated equipments for the BARC Charged Particle Detector Array

    A 60 cm diameter spherical high-vacuum target-chamber with side-opening hemispherical-lids, two ancillary-chambers, beam-line-tubes, tees and other high-vacuum components, and chamber-lid handling systems have been designed, constructed and installed for the Charged Particle Detector Array in BARC-TIFR Pelletron-LINAC Facility, Mumbai. This array of several tens of Si-CsI detector modules and other ancillary-detectors will be used for investigations in fusion-fission dynamics, nuclear structure at elevated temperatures and angular momenta, exotic nuclear clusters and related fields. This paper describes the unique features of the system that aid different coincidence experiments, the chamber fabrication experience and the pump-down characteristics with a turbo molecular pump. Unlike many other target chambers in use, this chamber allows multiple overall geometrical configurations to be set to reach experimental goals. For instance, by replacing a hemispherical-lid from one side with a flat-lid, the overall configuration becomes hemispherical. This way, high geometrical efficiency can be provided to an ancillary gamma detector array by allowing it to move close to target from the flat-lid side, although with some sacrifice of geometrical efficiency for charged particles. In experiments where a further improvement of geometrical efficiency for a gamma array is desired, a third compact-cylinder configuration can also be arrived at. Thinned portion of the lids of the chamber also allow neutron coincidence measurements with charged particles and gamma rays.

  17. Development of AUC-based process at BARC for production of free-flowing and sinterable UO2 powder

    Ammonium uranium carbonate (AUC) process has been developed and industrially used in Germany for preparation of free-flowing and sinterable UO2 powder for fabrication of UO2 fuel pellets for light water reactors (LWR). Efforts are underway at Bhabha Atomic Research Centre (BARC) for developing AUC-based process which would yield free-flowing UO2 powder suitable for direct pelletisation and sintering to very high density (> 96% T.D.) UO2 fuel pellets for pressurised heavy water reactors (PHWRs) in India. The first phase of this work has been completed jointly by Chemical Engineering Division (ChED) and Radiometallurgy Division (RMD) in batches of 1.5 kg. It was possible to fabricate UO2 pellets of density 93-95% T.D. on a reproducible basis. At ChED, process parameters have been optimised for fabrication of AUC with suitable physical properties in batches of 1.5 kg (U), starting with nuclear pure uranyl nitrate solution. At RMD calcination parameters of AUC was optimised in batches of 500 g for obtaining free-flowing UO2 powder, suitable for direct pelletisation and sintering. The pelletisation and sintering have been carried out at Radiometallurgy Division in batches of 1-1.5 kg. The maximum achievable density of UO2 pellets has been in the range of 95.5-96% T.D. (author). 11 refs

  18. Assessment of Ultimate Load Capacity for Pre-Stressed Concrete Containment Vessel Model of PWR Design With BARC Code ULCA

    Ultimate load capacity assessment of nuclear containments has been a thrust research area for Indian Pressurised Heavy Water Reactor (PHWR) power programme. For containment safety assessment of Indian PHWRs a finite element code ULCA was developed at BARC, Trombay. This code has been extensively benchmarked with experimental results. The present paper highlights the analysis results for Prestressed Concrete Containment Vessel (PCCV) tested at Sandia National Labs, USA in a Round Robin analysis activity co-sponsored by Nuclear Power Engineering Corporation (NUPEC), Japan and the U.S Nuclear Regulatory Commission (NRC). Three levels of failure pressure predictions namely the upper bound, the most probable and the lower bound (all with 90% confidence) were made as per the requirements of the round robin analysis activity. The most likely failure pressure is predicted to be in the range of 2.95 Pd to 3.15 Pd (Pd= design pressure of 0.39 MPa for the PCCV model) depending on the type of liners used in the construction of the PCCV model. The lower bound value of the ultimate pressure of 2.80 Pd and the upper bound of the ultimate pressure of 3.45 Pd are also predicted from the analysis. These limiting values depend on the assumptions of the analysis for simulating the concrete-tendon interaction and the strain hardening characteristics of the steel members. The experimental test has been recently concluded at Sandia Laboratory and the peak pressure reached during the test is 3.3 Pd that is enveloped by our upper bound prediction of 3.45 Pd and is close to the predicted most likely pressure of 3.15 Pd. (authors)

  19. Micro-controller based fiber optic data telemetry system for the ion source of low energy accelerator facility at BARC

    The Low Energy Accelerator Facility (LEAF) is a 50 keV, high intensity, negative ion accelerator facility that has been set up indigenously at Nuclear Physics Division, BARC. This facility is capable of delivering a wide range of negative ion beams of both light and heavy ions across the periodic table using a SNICS II (Source of Negative Ion by Caesium Sputtering) source. A micro-controller based control and monitoring system has been developed exclusively for the ion source parameters of LEAF. The data control and monitoring system mainly targets acquiring the data from the field in the terms of parameters such as voltages and currents. There are processes which need to be monitored continuously in order to keep certain parameters under check. The microcontroller based fiber optic data telemetry system allows us to perform the aforesaid task. The voltages can be controlled and monitored by providing the inputs and receiving the feedback through a user friendly graphic user interface. With this system one can control the status as well as analog value of the high voltage power supplies like extractor, cathode, filament, focus line heater and oven. This system consists of Fiber optic transceiver, which is connected on serial port (RS 232C) of microcontroller as well as RS232 port of PC. The whole control system is reliable even in noisy environments including RF and worse EMI conditions. This compact modular design is implemented using low cost devices and allows easy and fast maintainability. In the paper, the details of the system are presented. (author)

  20. Study on the atmospheric dispersion of pollutant in the presence and absence of a hill for BARC, Trombay site

    Blocking effects generated by topographical features leads to complex flow patterns that might generate mean concentration distributions significantly different from those that might be expected from the mean flow in the absence of the complex terrain features for atmospheric releases of pollutants. The present paper deals with one such study of the effect of a hill on the atmospheric dispersion of pollutant for BARC, Trombay site. The study of wind flow as well as the atmospheric dispersion of pollutant in the presence of 130 m hill behind PP is found to be important to gauge the radiological consequences on population residing beyond this hill. The results of study of the effect of this hill on the wind flow and the concentration distribution of pollutants on the upwind and downwind side of the hill are presented in the paper. It is seen that the wind flow gets modified leading to deceleration in the upwind side of the hill due to terrain blocking, speed up at the top of the hill and deceleration behind the hill. In the absence of hill, flow remains uniform in the downwind direction. It is also found that in the presence of the hill, the released pollutant disperses more as compared to the absence of the hill. Because of the additional dispersion provided by the hill and also because of the elevated topography, the peak concentration value in the presence of hill is obtained at shorter distance when compared with the other case. The peak ground level concentration value found in the presence of hill is relatively higher; however, for the population residing at farther distances, the additional dilution provided by the hill reduces the ground level concentration. (author)

  1. BARC golden jubilee and DAE-BRNS life sciences symposium 2006 on trends in research and technologies in agriculture and food sciences: abstracts

    Better methods of agricultural production, availability of hybrid and mutant varieties of crop plants, irrigation, fertilizers and pesticides have all helped boost up agricultural production, and famines and droughts remain restricted to a few pockets in the world. Innovative approach to step up agricultural production, especially of food crops symbolize synergy and synthesis of conventional and mutation breeding aided by modern biotechnological tools like DNA markers and gene manipulation in tune with the policy of environmental and soil conservation. It has increased the production of oil seeds in India during the last decade with a shift from groundnut and mustard to soybean and sunflower. Bhabha Atomic Research Centre (BARC), Mumbai which has strongly pursued the important societal programmes using nuclear technology in agriculture and health, has made a very significant impact on the country's agriculture by developing 27 new crop varieties mostly of oil seeds and pulses. Further, radiation processing of food, pioneered in India by BARC, is now gaining global acceptance and has opened new vistas for agriculture exports. The present symposium is dedicated to trends in research of technologies in agriculture and food sciences. The papers relevant to INIS are indexed separately

  2. BARC progress report - 1996

    This report summarises the various activities and research and development programmes of the different Divisions of the Bhabha Atomic Research Centre, Mumbai. The list of publications and paper presented at various conferences, symposia, workshops etc and papers published in various journals by the staff members of the different Divisions are also given. (author)

  3. BARC highlights 1991

    Some of the important research and development (R and D) activities carried out at the Centre during the last two or three years are described in brief. The descriptions are arranged under the headings : Physical Sciences, Chemical Sciences, Material and Materials Science, Radioisotopes, Reactors, Fuel Cycle, Radiological Safety and Protection, Electronics and Instrumentation, Engineering Services, and Life Sciences. The text is illustrated with a number of photographs - some of them coloured. (M.G.B.)

  4. BARC annual report 1987

    The report summarises the Research and Development (R and D) activities of the Bhabha Atomic Research Centre, Bombay, during 1987. These R and D activities are described in the chapters entitled: Physical Sciences, Chemical S ciences, Materials and Materials Sciences, Radioisotopes, Reactors, Fuel Cycle, Radiological Safety and Protection, Electronics and Instrumentation, Engineering Services, and Life Sciences. Activities in the fields of remote handling and robotics, technology transfer, and auxiliary activities like technical information, human resources and development etc. are dealt in the chapter entitled General. At the end of each chapter, a list of publications by the scientists in the corresp onding subject field is given. Some of the major highlights of the work during 1987 are: (1) DHRUVA reactor became fully operational at its rated capacity making neutrons available for isotope production and studies in neutron scattering and condensed matter, (2) R and D activities were extended to study h igh temperature superconductivity in both fundamental and applied aspects and (3) a laboratory for production of 32P-biomolecules was set up at the Centre for Cellular and Molecular Biology at Hyderabad. (M.G.B.)

  5. BARC progress report - 1998

    This report is a compilation of the progress in various major activities and Research and Development programmes of the different Divisions of the Bhabha Atomic Research Centre, Mumbai. The list of publications and papers presented at the various conferences, symposia, workshops and papers published in journal by the staff members of the Divisions are also given. (author)

  6. BARC progress report - 1997

    This report is a compilation of the progress in various major activities and Research and Development programmes of the different Divisions of the Bhabha Atomic Research Centre, Mumbai. The list of publications and papers presented at the various conferences, symposia, workshops and papers published in journal by the staff members of the Divisions are also given. (author)

  7. Mutation induction, evaluation and utilization for development of high yielding varieties in Indian mustard and sunflower: an overview of BARC work

    Mutation breeding programme in Indian mustard and sunflower at BARC has resulted into the development of wide spectrum of mutations for seed coat colour, chlorophyll, plant height, maturity, flower morphology, seed weight and oil content. In Indian mustard, TM1 and TM50 are high yielding yellow seed coat mutants, which were exploited in hybridisation to develop bold, yellow seed coat and high yielding genotypes. Light green leaf and variegated leaf are novel mutation in mustard. Putative mutants for drought tolerance have been isolated. Variability for zero erucic acid and zero glucosinolates genotypes have been developed in B. napus and B. juncea. In sunflower, high yielding black seed coat mutant were isolated. Extreme dwarf measuring only 11 cm is novel. Three high yielding varieties namely TM2, TM4, and TPM1 in mustard and one i.e.TAS82 in sunflower have been released for cultivation in collaboration with state agricultural universities. (author)


    Tomislav Malvić


    Full Text Available Neogene depositional environments in the Drava depression can be classified in two groups. One group is of local alluvial fans, which were active during the period of Middle Miocene (Badenian extension through the entire Pannonian Basin. The second group is represented by continuous Pannonian and Pontian sedimentation starting with lacustrine environment of partly deep water and partly prodelta (turbidity fans and terminating at the delta plain sedimentation. The coarse-grained sediments of alluvial fans have the great hydrocarbon potential, because they often comprise reservoir rocks. Reservoir deposits are mostly overlain (as result of fan migration by pelitic seal deposits and sometimes including organic rich source facies. That Badenian sequences are often characterised by complete petroleum systems, what is confirmed by large number of oil and gas discoveries in such sediments in the Drava and other Croatian depressions. Alluvial environments are characterised by frequent changes of petrophysical properties, due to local character of depositional mechanism and material sources. In the presented paper, Stari Gradac-Barcs Nyugat field is selected as a case study for demonstrating the above mentioned heterogenic features of the Badenian sequences. Structural solutions are compared by maps of parameters related to depositional environment, i.e. porosity and thickness maps. Geostatistics were used for spatial extension of input dataset. The spatial variability of porosity values, i.e. reservoir quality, is interpreted by transition among different sub-environments (facies in the alluvial fan system.

  9. Control and interlocking of ventilation system at Advanced Fuel Fabrication Facility, BARC, Tarapur using microprocessor based programmable logic controllers (Paper No. 5.4)

    A nuclear fuel fabrication facility has been set up by BARC at Tarapur. These fuel elements being radioactive emit nuclear radiation which is hazardous to human beings. Therefore these fuel elements during fabrication stage are handled in totally enclosed transparent boxes known as glove boxes. To prevent leakage from these glove boxes the once through ventilation system at fuel fabrication facility has been designed and interlocked such that air flow is always from surrounding atmosphere to laboratory rooms to glove boxes. This is achieved by maintaining negative air pressure in laboratory rooms and still higher negative pressure in glove boxes. Some interlocking logics have been defined to achieve these interlocks by operating a combination of specified number of main exhaust blowers, glove exhaust blowers and supply blowers. This interlocking has been done on electrical side and being very complicated, programmable logic controllers have been used instead of electromagnetic relays for building the blocks of interlocking scheme. With PLC, once the system is hard wired, any change in logic can be easily effected by reprogramming the system. In this paper the commissioning experience, teething troubles faced, remedial measures taken and modifications carried out are discussed. (author)

  10. A Seven-Year Major and Trace Element Study of Rain Water in the Barcés River Watershed, A Coruña, NW Spain

    Delgado, Jordi; Cereijo-Arango, José Luis; Juncosa-Rivera, Ricardo


    Precipitation constitutes an important source of soluble materials to surface waters and, in areas where they are diluted precipitation (either dry or wet) it can be the most relevant solute source. Certain trace elements may have a limited natural availability in soils and rocks although they can be important with respect the operation of different biogeochemical cycles, for the computation of local/regional atmospheric pollutant loads or from the global mass budget. In the present study we report the results obtained in a long-lasting (December 2008-December 2015) monitoring survey of the chemical composition of bulk precipitation as monthly-integrated samples taken at the headwaters of the Barcés river watershed (A Coruña, Spain). This location was selected based on the necessity of quantification of the chemical composition and elemental loads associated with the different water types (stream water, ground water and precipitation) contributing to the flooding of the Meirama lake. Available data includes information on meteorological parameters (air temperature, relative humidity, atmospheric pressure, wind speed and direction, total and PAR radiation and precipitation) as well as a wide bundle of physico-chemical (pH, redox, electrical conductivity, alkalinity, Li, Na, K, Mg, Ca, Sr, Mn, Fe, NH4, Cs, Rb, Ba, Zn, Cu, Sb, Ni, Co, Cr, V, Cd, Ag, Pb, Se, Hg, Ti, Sn, U, Mo, F, Cl, Br, SO4, NO3, NO2, Al, As, PO4, SIO2, B, O2, DIC, DOC) and isotopic (18Ov-smow and 2Hv-smow) constituents. The average pH of local precipitation is 5.6 (n=65) which is consistent with the expected value for natural, unpolluted rain water. Most of the studied elements (eg. Na, Ca, K, Mg, SiO2, etc.) shows significant increases in their concentration in the dry period of the year. That points towards a more significant contribution of dry deposition in these periods compared with the wet ones. The average electrical conductivity is about 67 S/cm while the average chloride

  11. Integrated Water Basin Management Including a Large Pit Lake and a Water Supply Reservoir: The Mero-Barcés Basin

    Delgado, Jordi; Juncosa-Rivera, Ricardo; Hernández-Anguiano, Horacio; Muñoz-Ibáñez, Andrea


    use of lake water is acceptable from different points of view (water quality, legal constrains, etc.). Our results indicate that the joint use of the lake/reservoir system is feasible. Based on this and other complementary study, the basin water authorities has developed a project by which a 2.1 km uptake tunnel will be excavated in the next years to drain water from the lake towards the Barcés river and complement the water supply necessities of the Abegondo-Cecebre reservoir in case of hydric emergencies.

  12. Food preservation technologies developed at BARC

    Food irradiation is important as it is being used to disinfest food grains, pulses, wheat flour, rice, semolina, raisins etc; quarantining and shelf life increasing of fruits like mangoes; microbial decontamination of spices; sprout inhibition of tubers and bulbs; shelf life increasing and pathogen control of meat and fish. Category-IV type irradiators based on gamma rays exposure of food are currently being employed for this purpose. Cobalt-60 isotope is produced in the nuclear reactors. Isotope gives gamma rays as its nucleus is unstable. The gamma rays pass through the food items and inhibit sprouting of tubers and bulbs, kill bacteria, virus and the larvae of insects

  13. Generation of aerosols: BARC nebulizer and others

    The concern with atmospheric pollution in recent times has focused attention on aerosols, their distribution pattern after inhalation and the kinetics of their deposition and exclusion from bronchial passages. The technique of radioaerosols for lung imaging is of recent origin. The procedure was proposed as a means of estimating regional ventilation and localizing areas of airway narrowing. The technique is an alternative in the face of non-availability of radioactive gases, especially in developing countries where the cost is the major factor due to economic reasons. Now, it is beyond doubt that radioaerosol lung studies are a potentially valuable tool in the evaluation of respiratory function in health and disease, especially to detect chronic obstructive pulmonary diseases. Also, the administration of a drug by aerosol inhalation provides a convenient method for the treatment of conditions affecting the respiratory system. This write-up will brief us about radioaerosol, its generation and characterisation

  14. High-Si content BARC for dual-BARC systems such as trilayer patterning

    Kennedy, Joseph; Xie, Song-Yuan; Wu, Ze-Yu; Katsanes, Ron; Flanigan, Kyle; Lee, Kevin; Slezak, Mark; Liu, Zhi; Lin, Shang-Ho


    This work discusses the requirements and performance of Honeywell's middle layer material, UVAS, for tri-layer patterning. UVAS is a high Si content polymer synthesized directly from Si containing starting monomer components. The monomers are selected to produce a film that meets the requirements as a middle layer for tri-layer patterning (TLP) and gives us a level of flexibility to adjust the properties of the film to meet the customer's specific photoresist and patterning requirements. Results of simulations of the substrate reflectance versus numerical aperture, UVAS thickness, and under layer film are presented. ArF photoresist line profiles and process latitude versus UVAS bake at temperatures as low as 150ºC are presented and discussed. Immersion lithographic patterning of ArF photoresist line space and contact hole features will be presented. A sequence of SEM images detailing the plasma etch transfer of line space photoresist features through the middle and under layer films comprising the TLP film stack will be presented. Excellent etch selectivity between the UVAS and the organic under layer film exists as no edge erosion or faceting is observed as a result of the etch process. A detailed study of the impact of a PGMEA solvent photoresist rework process on the lithographic process window of a TLP film stack was performed with the results indicating that no degradation to the UVAS film occurs.

  15. Development of scintillation and luminescent detectors at BARC

    Research and development work carried out at the Bhabha Atomic Research Centre, Bombay, in the field of radiation detectors for various applications, particularly in the area of scintillation and luminescent detectors is reviewed. The review is presented in the form of 7 articles. (author). figs

  16. Production and fabrication of thorium fuels at BARC

    Thorium oxide can be consolidated by conventional powder metallurgy technique of compaction and sintering. Thorium oxide is a difficult material to sinter and even at a sintering temperature of 2000degC, the density achievable is not > 80% T.D. Hence, activated sintering with the use of additives is resorted to for achieving densities > 90% T.D. Sinterability of thoria powders obtained from different compounds such as hydroxide, hydrocarbonate, tannate, oxalate etc. has been thoroughly investigated. The effect of different additives such as CaO, CaF2, MgO, Nb2O5 on the sinterability of thoria has been extensively studied. With the addition of 0.25% Nb2O5, sintering temperature can be brought down to as low as 1150deg-1200degC. High density thoria pellets have been fabricated for use in CIRUS, DHRUVA, FBTR, PHWRs and Experimental Fission/Fusion Hybrid Systems. (author). 6 refs., 8 figs

  17. Utilization of the BARC critical facility for ADS related experiments

    Rajeev Kumar; R Srivenkatesan


    The paper discusses the basic design of the critical facility, whose main purpose is the physics validation of AHWR. Apart from moderator level control, the facility will have shutdown systems based on shutoff rods and multiple ranges of neutron detection systems. In addition, it will have a flux mapping system based on 25 fission chambers, distributed in the core. We are planning to use this reactor for experiments with a suitable source to simulate an ADS system. Any desired sub-criticality can be achieved by adjusting the moderator level. Apart from perfecting our experimental techniques, in simple configurations, we intend to study the one-way coupled core in this facility. Preliminary calculations, employing a Monte Carlo code TRIPOLI, are presented.

  18. Experiences in safe use of material handling equipment at BARC

    Material handling is a basic requirement of all the tasks we perform. Equipment used for handling of materials provide great flexibility in relieving man-power, reduced time and in ensuring safety of men and materials. These Materials Handling Equipment (MHE) refer to various materials handling equipment, including forklifts, cranes, chain pulley blocks, tractors, and other specialized industrial trucks powered by electric motors or internal combustion engines. Proper maintenance of these equipment is essential, because, in addition to enhanced safety, it prevents loss of business or production caused by mechanical failure. This paper discusses on the experiences in respect of safe use of MHE achieved through a typical systematic approach to maintenance of material handling equipment. (author)

  19. Gas-gun facility for shock wave research at BARC

    For carrying out shock-wave experiments on materials, we have built a 63 mm diameter gas-gun facility at our laboratory. It is capable of accelerating projectiles (about half kg in weight) to velocities up to 1 km/s using N2 and He gases. These on impacting a target generate shock pressures up to 40 GPa, depending upon the impedance of the impactor and the target. The barrel of the gun is slotted so that a keyed projectile can be fired for combined compression- shear studies. Large samples can be shocked (about 60 mm diameter and 5-10 mm thick), with pressures lasting for a few microseconds. The gun is similar in design to the one at Washington State University. A number of diagnostic techniques have also been developed. These include measurement of projectile velocity, tilt between the impactor and the target, shock velocity in the target, and time resolved in-material stress wave histories in the shock loaded samples. Recovery capsules have also been made to retrieve shocked samples on unloading, which are then analysed using microscopic techniques like x-ray diffraction, Raman and electron microscopy. The gun has been performing well and has already been used for a few phase transition studies. (author). 73 refs., 42 figs

  20. Present status of linear induction accelerator development at BARC

    A Linear Induction Electron Accelerator of rating- 200 keV, 5 kA, 100ns, 10-100 Hz, is in the advanced stage of commissioning at Bhabha Atomic Research Centre. This paper presents a few experimental results while developing the various sub-systems of this accelerator. It comprises of 3-stage induction cavities, solid state modulator based command resonant charging system with high power SCR switching in 10-100 Hz to amorphous core based 2.5 kV/20 kV, 20μs pulse transformer, magnetic switches and DC choke along with 100 A DC reset current systems. (author)

  1. Accelerator mass spectrometry programme at BARC-TIFR pelletron accelerator

    Accelerator based mass spectrometry (ABMs) is an ultra sensitive means of counting individual atoms having sufficiently long half life and available in small amount. The 14 U D Pelletron Accelerator is an ideal machine to carry out ABMs studies with heavy isotopes like 36Cl and 129I. Cosmogenic radio isotope 36Cl is widely being detected using ABMs as it has got applications in ground water research, radioactive waste management, atmospheric 36Cl transport mechanism studies of Arctic Alpine ice core etc. As a part of the ongoing ABMs programme at 14UD Pelletron Accelerator Facility at Mumbai, a segmented gas detector developed for identification of 36Cl was tested for performance. Recently a beam chopper required for this measurement has been developed. Further progress made in this programme is discussed in this paper. (author)

  2. Beam optics of the folded tandem ion accelerator at BARC

    S Santra; P Singh


    The beam optics of the 6 MV folded tandem ion accelerator, that has recently been commissioned at Bhabha Atomic Research Centre, Mumbai, is presented. Typical beam trajectories for proton and 12C beams under different conditions, are shown. The constraints on the design due to the use of the infrastructure of the Van de Graaff accelerator, which existed earlier, are discussed.

  3. BARC studies in cold fusion (April-September 1989)

    The report is a compilation of accounts of investigations of various aspects of cold fusion phenomenon during the period April-September 1989 at the Bhabha Atomic Research Centre, Bombay. The report is divided into three parts, namely, Part A, Part B and Part C. Part A consists of 11 papers covering cold fusion through electrolysis channel, while Part B consists of 4 papers covering cold fusion through the route of deuterium loading in the gas phase. Part C consists 5 papers discussing theoretical aspects of cold fusion phenomenon. Some of the papers in the Part C are published as Journal articles. Results show that: (1) d-d fusion reaction does occur in both electrolytic and deuterium loaded palladium and titanium metal lattices at ambient temperature, (2) neutrons and tritium are produced at the same time, but overall neutron to tritium ratio is very low indicating that tritium is the main end product and cold fusion is 'aneutronic' in nature, (3) neutron emission follows Poisson distribution pattern i.e. neutrons are emitted one at a time, however, 15 to 20 per cent of emitted neutrons are generated in bunches or bursts, (4) cold fusion is essentially a surface phenomenon and (5) for detection of tritium in the products of cold fusion, autoradiography is a reliable technique. (M.G.B.)

  4. Large sample NAA work at BARC: Methodology and applications

    Acharya, R., E-mail: [Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085 (India); Swain, K.K. [Analytical Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085 (India); Sudarshan, K.; Tripathi, R.; Pujari, P.K. [Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085 (India); Reddy, A.V.R. [Analytical Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085 (India)


    Large sample neutron activation analysis (LSNAA) was carried out using thermal column facility of Apsara reactor at Bhabha Atomic Research Centre, Mumbai, India. The k{sub 0}-based internal monostandard NAA (IM-NAA) using in situ detection efficiency was used to analyze large and non-standard geometry samples of clay pottery, uranium ore and stainless steel. Elemental concentration ratios with respect to Na as a monostandard were used in the study of pottery and ore samples. For stainless steel sample of SS 304L, the absolute concentrations were calculated from concentration ratios by mass balance approach since all the major elements (Fe, Cr, Ni and Mn) were amenable to NAA. Applications of LSNAA in the above-mentioned three different areas are described in this paper.

  5. Current programmes on physical metallurgy and related areas in BARC

    Current research and development programmes on physical metallurgy and related areas from the following Divisions of Bhabha Atomic Research Centre are included in this report : Atomic Fuels Division, High Pressure Physics Division, Metallurgy Division, Radio Metallurgy Division, Solid State Physics Division. Important publications corresponding to each activity have also been listed. (author)

  6. Recent trials with the experimental helium liquefier developed by BARC

    An experimental helium liquefier has been designed and fabricated by Cryo-Technology Division and installed at Bhabha Atomic Research Centre, Mumbai. The helium liquefaction process is based on a modified Collin's cycle consisting of one pre-cooler turboexpander, a pair of by-pass turboexpanders (warm and cold) and a series of 7 compact brazed plate fin high effectiveness heat exchangers. Liquid nitrogen pre-cooling facility along with another heat exchanger to recover cold of gaseous nitrogen has also been provided in the system. After the full installation of the process compressor and its integration with the helium liquefier cold box, trial runs were started. A lowest temperature of about 7.8 K was registered in a temperature sensor located downstream of the JT valve. (author)

  7. Beam acceleration through proton radio frequency quadrupole accelerator in BARC

    Bhagwat, P. V.; Krishnagopal, S.; Mathew, J. V.; Singh, S. K.; Jain, P.; Rao, S. V. L. S.; Pande, M.; Kumar, R.; Roychowdhury, P.; Kelwani, H.; Rama Rao, B. V.; Gupta, S. K.; Agarwal, A.; Kukreti, B. M.; Singh, P.


    A 3 MeV proton Radio Frequency Quadrupole (RFQ) accelerator has been designed at the Bhabha Atomic Research Centre, Mumbai, India, for the Low Energy High Intensity Proton Accelerator (LEHIPA) programme. The 352 MHz RFQ is built in 4 segments and in the first phase two segments of the LEHIPA RFQ were commissioned, accelerating a 50 keV, 1 mA pulsed proton beam from the ion source, to an energy of 1.24 MeV. The successful operation of the RFQ gave confidence in the physics understanding and technology development that have been achieved, and indicate that the road forward can now be traversed rather more quickly.

  8. Design and development of collimator for 9 MeV BARC-ECIL linac

    High Energy electron beam technology is useful for both fundamental and applied research in the sciences, and also in many technical and industrial fields. It has been estimated that there are approximately 26,000 accelerators worldwide. The collimator is designed to function with a 9 MeV LINAC Test Facility (LTF) at ECIL, Hyderabad. The accelerated electron beam hits a tantalum target and X-Rays generated though the target are fed to the collimator. Thereafter, collimated high energy X-Rays will be used for cargo scanning. The X-ray collimator will complement the existing system at LTF, ECIL to get collimated fan beam. A collaborative effort has been made to identify novel and advanced materials to achieve low coefficient of friction for various lateral and angular movements of collimator plates weighing nearly 5 tons. Complex numerical calculations simulating extreme conditions and experimental tests have been undertaken using Ansys. In parallel, an innovative modular design concept of the assembly has been developed to allow fitting in alternative materials, minimizing the load induced deformations, withstanding accidents and accepting desired radiation doses. The collimator plates are made up of mild steel blocks of IS 2062A grade ensuring high geometrical stability. The assembly structures for the collimator are made up of high stiffness I-beams ISMB 150. Each plate has been machined with high precision Electric Discharge Machining (EDM) and Surface Grinding processes. The plates are also hard chrome plated to provide corrosion resistance and increase surface hardness. A full scale collimator prototype has been manufactured to validate each feature of the new design at the LTF, ECIL, Hyderabad. (author)

  9. Beam line control system for BARC-TIFR super conducting linac booster

    LINAC control system is a distributed control system. Hardware is distributed geometrically for RF control and monitoring with four nodes for RF control. Systematic distribution is applied by addition of different node for Beam line instrument control (BLS) which consists of different focussing magnets, steerers and beam diagnostics devices (Faraday cups and BPMs) and magnetic field measurement devices hall probes. All the focussing and diagnostics devices have their built-in microprocessor based electronic interfaces, which can be remotely accessed by RS 232/RS 422 link. The serial devices are connected to three different 16 port RS232 to Ethernet converter switch, which are connected to LINAC lab by Ethernet link. Multilevel software is developed in JAVA, with useful and attractive virtual panel interface provided by monitor and keyboard. (author)

  10. Dummy accelerating tube as a matching lens for 14UD Pelletron Accelerator, BARC-TIFR, Mumbai

    14UD Pelletron Accelerator Facility has been operational since 1989. The potential grading in the accelerator column and tube is achieved by corona points. At present column and tube corona points are replaced by resistance. The resistance per module in the column and tube are 36 GΩ and 33 GΩ respectively

  11. Indigenous development of neutron detectors for use at various neutron scattering instruments at BARC

    Gas filled neutron detectors are developed in-house for various neutron scattering instruments, located at neutron beam research facility, Dhruva and CIRUS. This development program is successfully carried out to upgrade the scattering instruments with respect to detection efficiency, instrument resolution and judicial utilization of reactor beam time. The range of detectors include the miniature beam monitors, 1 m long 1-D Position sensitive detectors (PSD), 1-D PSD based on microstrip and 2-D PSD based on multiwire geometry. Developmental work involves detailed investigations on hardware aspects, behavior of gases and processing electronics for optimization of PSD performance. The Powder Diffractometer and Hi-Q Diffractometer make use of 5 identical 1 m long I-D PSDs to scan scattering angles in range 3 deg to 140 deg. Up gradation of these instruments using 15 high efficiency PSDs, arranged in three stacks of 5 PSDs in a layer, is, in progress. With each PSD (3He 10 bar + Kr 2 bar) showing the efficiency gain of 2 at 1.2 A, detector bank is expected to show overall gain in detection efficiency 6 times the present value and reduction in data collection time by equivalent factor. Neutron Reflectometer uses a 20 cm long PSD based on carbon coated quartz high resistive anode. Operational stability and position resolution of desired magnitude is obtained. Further up gradation to stack of 2 PSDs for improving detection efficiency is in progress. Developmental work on prototype microstrip based detector and multiwire based 2-D PSD based on charge division readout method is presented. Multiwire based PSD with delay line readout method, shows the advantage of better position resolution and high count rate capability. Low efficiency neutron beam imaging monitor is successfully developed using delay line readout method. Review on development and characterization of these detectors is presented. (author)

  12. Design and simulation and development of waveguide components for LEHIPA at BARC

    RF power transmission systems are very important components for distribution of high RF power from the amplifier to the RFQ and other accelerating structures (i.e. Drift Tube Linac (DTL)). For distribution of hundreds of kW RF power at UHF frequencies, standard size of WR2300 type waveguides is suitable. Since LEHIPA is 20 MeV, high intensity accelerator with beam current up to 30mA, it requires RF power in MW range. 3 MeV RFQ requires RF power up to 600 kW (max) at 352.21 MHz from the RF amplifier, which is based on Klystron amplifier system. Complete RF power distribution system requires waveguide bends of different types, magic Tee and tapers etc. A Half Height magic Tee with (dimension of WR2300) has been designed using CST microwave studio as simulation tools. This design uses an iris in the E arm, a post in the H arm with additional conical section in the main arm to achieve port match in the desired frequency band. Return loss is 35 dB or better and isolation is better than 90 dB in the Frequency band 352.21 MHz +/-2 MHz. We have designed different types of waveguide bends i.e. 90 degree Half height H plane bends, 90 degree full height E plane bends, 30 degree H plane bend etc. All these components are made on standard size of WR2300 waveguide. Some of these designs are under fabrication. This paper will describe detailed design parameters, simulation (using CST microwave studio) and its results. (author)

  13. Development of a terminal voltage stabilization system for the FOTIA at BARC

    M J Kansara; P Sapna; N B V Subrahmanyam; J P Bhatt; P Singh


    A terminal voltage stabilization system for the folded tandem ion accelerator (FOTIA) was developed and is in continuous use. The system achieves good voltage stabilization, eliminates ground loops and noise interference. It incorporates a correcting circuit for compensating the mains frequency variations in the GVM amplifier circuit. The present system has two modes of operation namely GVM control mode and slit control mode. A voltage stability of about ± 2 kV has been achieved. In this paper, some of the salient features of the voltage stabilization system are discussed.

  14. Containment aerosol behaviour simulation studies in the BARC nuclear aerosol test facility

    A Nuclear Aerosol Test Facility (NATF) has been built and commissioned at Bhabha Atomic Research Centre to carry out simulation studies on the behaviour of aerosols released into the reactor containment under accident conditions. This report also discusses some new experimental techniques for estimation of density of metallic aggregates. The experimental studies have shown that the dynamic densities of aerosol aggregates are far lower than their material densities as expected by the well-known fractal theory of aggregates. In the context of codes, this has significant bearing in providing a mechanistic basis for the input density parameter used in estimating the aerosol evolution characteristics. The data generated under the quiescent and turbulent conditions and the information on aggregate densities are now being subjected to the validation of the aerosol behaviour codes. (author)

  15. 36Chlorine accelerator mass spectrometry programme at BARC-TIFR pelletron accelerator. RSP-12

    Accelerator mass spectrometry (AMS) is an ultra sensitive means of counting individual atoms having sufficiently long half life and available in small amount. The 14 UD Pelletron Accelerator is an ideal machine to carry out AMS studies with heavy isotopes like 36Cl and 129I. Cosmogenic radio isotope 36Cl is widely being detected using AMS as it has got applications in ground water research, radioactive waste management, atmospheric 36Cl transport mechanism studies of Arctic Alpine ice core etc. As a part of the ongoing AMS programme at 14UD Pelletron Accelerator Facility, Mumbai, a segmented gas detector developed for identification of 36Cl was tested for performance. Recently a beam chopper required for this measurement has been developed. 36Cl measurements carried out to detect and measure the ratio of 36Cl to 35Cl in an irradiated sample and dated sample are reported in this paper

  16. Accelerator mass spectrometry programme at BARC-TIFR pelletron accelerator. PD-1-2

    Accelerator mass spectrometry (AMS) is an ultra sensitive means of counting individual atoms having sufficiently long half-life and available in small amount. The 14 UD Pelletron Accelerator is an ideal machine to carry out AMS studies with heavy isotopes like 36Cl and 129I. Cosmogenic radioisotope 36Cl is widely being detected using AMS as it has got applications in ground water research, radioactive waste management, atmospheric 36Cl transport mechanism studies of Arctic Alpine ice core etc . The AMS programme at the 14 UD Mumbai Pelletron Accelerator has taken off with the installation of the state of the art Terminal Potential Stabilizer setup and operation of the accelerator in Generating Volt Meter (GVM) mode. Feasibility studies have been carried out for detection/identification of 14C from a charcoal sample and 3He in natural Helium. As the primary interest of AMS programme at Mumbai Pelletron Accelerator is related to the cosmogenic nuclei, 36Cl and 129I, a segmented gas detector developed for identification of 36Cl was tested for performance. Recently a beam chopper required for this measurement has also been developed

  17. Three dimensional analysis of piping components using BARC finite element based damage mechanics code MADAM

    This work has been carried out at State Institute for Material Testing (MPA), University of Stuttgart, Germany as part of the research project named Transferabililty of specimen data to component level under Indo-German Bilateral project (IND-98/329) during the period 5 th August, 2000 to 30 th December, 2000. In this project, we have used Gurson-Tvergaard-Needleman's model for predicting the fracture behaviour of real life pipes and elbows made of two different materials (one German austenitic steel and other Indian ferritic steel). The inhouse damage mechanics MADAM has been used for all the calculations. The results have been compared with the experimental results in order to establish the method and the Gurson parameters. The Gurson parameters have been determined by a hybrid methodoly of metallographic analysis, numerical analysis of notched tensile tests and compact tension (C(T)) tests and by comparison with experimental results. Analysis has also be done for determining the multiaxiality parameter q existing in the crack plane of these components for both stationary crack and running crack. The parameter q has been studied for transferability of J-R curve from specimen to component level. The Gurson parameters have then been used to analyse a straight pipe with 122 deg circumferential throughwall crack under internal pressure of 16 Mpa and increasing bending moment for the German steel. For SA333 Gr.6 steel, the components tested are straight pipes and elbows with throughwall circumferential cracks of different crack angles under four point bending load. This report has been divided into three sections. Section-I deals with numerical analysis of ductile fracture for the German austenitic steel, i.e., DIN X6CrNiNb 18 10. Section-II deals with numerical analysis of ductile fracture for the Indian PHT material, i.e., SA333 Gr.6 carbon steel. Section-III deals with evaluation of stress multiaxiality quotient q for all the cracked geometries of importance at different stages of loading and study of the effect of geometry and loading on variation of q with distance from crack tip. (author) Key Words:- Damage mechanics, Gurson model, DIN X6CrNiNb1810, SA333Gr.6 carbon steel

  18. Experimental subcritical facility driven by D-D/D-T neutron generator at BARC, India

    Highlights: •Experimental subcritical facility BRAHMMA coupled to D-D/D-T neutron generator. •Preliminary results of PNS experiments reported. •Feynman-alpha noise measurements explored with continuous source. -- Abstract: The paper presents design of an experimental subcritical assembly driven by D-D/D-T neutron and preliminary experimental measurements. The system has been developed for investigating the static and dynamic neutronic properties of accelerator driven sub-critical systems. This system is modular in design and it is first in the series of subcritical assemblies being designed. The subcritical core consists of natural uranium fuel with high density polyethylene as moderator and beryllium oxide as reflector. The fuel is embedded in high density polyethylene moderator matrix. Estimated keff of the system is ∼0.89. One of the unique features of subcritical core is the use of Beryllium oxide (BeO) as reflector and HDPE as moderator making the assembly a compact modular system. The subcritical core is coupled to Purnima Neutron Generator which works in D-D and D-T mode with both DC and pulsed operation. It has facility for online source strength monitoring using neutron tagging and programmable source modulation. Preliminary experiments have been carried out for spatial flux measurement and reactivity estimation using pulsed neutron source (PNS) techniques with D-D neutrons. Further experiments are being planned to measure the reactivity and other kinetic parameters using noise methods. This facility would also be used for carrying out studies on effect of source importance and measurement of source multiplication factor ks and external neutron source efficiency φ∗ in great details. Experiments with D-T neutrons are also underway

  19. Track etch membranes (TEMs) for separation sciences from BARC-TIFR Pelletron accelerator

    Track etch membranes (TEMs) program at 14 UD Pelletron accelerator at TIFR, Mumbai, India using 25 micron thick polyethylene terepthalate film is described. Large scale preparation of TEMs by scanning heavy ion beams using a electromagnetic scanner and rolling mechanism using a geared D.C. motor and vacuum rotary feed through are presented. The selection of ions of suitable energy and etching parameters for making various pore sizes were investigated using Rutherford scattered beam from Pelletron accelerator. Pore size and pore density were measured using scanning electron microscope. Scanning width up to 35 cm and irradiation up to 22 m were successfully carried out using this facility. Some applications carried out using these membranes are also mentioned. (author)

  20. Role of Bhabha Atomic Research Center (BARC) parallel processing system in structural analysis of nuclear components

    Computational structural analysis of nuclear reactor components requires high speed computing systems. Parallel processing systems, such as ANUPAM developed at Bhabha Atomic Research Centre, have helped immensely in meeting this requirement. The implementation of structural integrity analysis code on ANUPAM is illustrated here by commissioning two in house codes TABS and FAIR. The parallelization strategies and the efficiency of ANUPAM are highlighted. (author). 6 refs., 3 figs

  1. Applications of image plates in neutron radiography and neutron diffraction at BARC, Trombay

    Neutron radiography techniques based on Gd, Dy and In metallic foils and X-ray film have been used at this centre since early seventies for various NDT and R and D work in nuclear, defence and aerospace industries. In recent years use of photostimulated luminescence based phosphor imaging plate has been introduced in our work. This has enabled to achieve higher sensitivities and dynamic ranges of recording radiographs with acceptable spatial resolution. It also provides digital image information which is more convenient for quantitative evaluations. Neutron image plates have been used in variety of radiography techniques such as conventional neutron radiography (NR), neutron induced beta radiography (NIBR), hydrogen sensitive epithermal neutron radiography (HYSEN) and for neutron powder diffractometry using Apsara, CIRUS and Dhruva reactors as neutron sources. Recently the image plates have also been used for characterization of thermalized neutron beam from a plasma focus neutron source and recording neutron radiographs. Prior to the utilization image plates have been characterised for their performance. Details of the measurements and applications will be presented. (author)

  2. Generation of ozone and safety aspects in an accelerator facility of BARC

    Industrial electron beam accelerators up to 10 MeV are commonly employed for different applications. During normal operation of an accelerator, the principal hazard is the high radiation level produced. Experiments and applications in which the electron beam is used to irradiate materials outside the accelerator vacuum system are associated with problems such as radiation damage and production of considerable quantities of ozone. The possible generation of ozone during the operation of an electron beam accelerator is of special interest due to reactivity, corrosivity and the toxic characteristics of ozone. Industrial hygiene surveys were conducted to estimate the airborne concentration of ozone during operations of the electron beam accelerator (Type: ILU-6; 2 MeV; 20 KW) at varied operating parameters. The ozone concentration in the accelerator room was measured at different powers of the accelerator and the ozone decay pattern was also observed after beam shut down. Ozone in the accelerator room was measured by different methods such as colorimetry using neutral buffered potassium iodide, chemiluminescence method using ethylene and by using electrochemical sensor. An air velocity meter was used to measure the linear air velocity across the exhaust grills and the number of air changes available in the accelerator room was calculated. Necessary control measures were suggested to keep the occupational exposure of the personnel to ozone concentrations well within the Threshold Limit Values. (author)

  3. Elemental characterisation of Gajahwong river (Indonesia) sediment using INAA at BARC

    Analysis on river sediment sample using Instrumental Neutron Activation Analysis (INAA) and gamma-ray spectrometry were conducted. The samples were collected around Gajahwong river (Yogyakarta , Indonesia) at nine places, in strategic locations from Tanen, Hargobinagun up to Kanggotan, Bantul. The samples were separated from stone, grass then dried under sun shine, grinded using pastel and mortar and homogenized. Accurately weighed samples a certain weight, sealed in double polythene bag and put in polythene bottle. The samples were irradiated for 7 hours in Apsara reactor (India) at E-8 position. The qualitative results show that the sediment samples from nine locations of the Gajahwong river contains elements like Nd, Gd, Sm, Lu, Eu, Hf, Ce, Ca, Th, Cr, Vb, La, Br, As, Ga, Sc, Fe, Co, Na, U, Se, Zn and Sn. The quantitative results using relative method show that the concentration of the elements respectively (12.18 -17.01) ppm, (3.30 - 5.56) ppm, (3.74 -4.75) ppm, (0.24 - 0.34) ppm, (0.84 -1.30) ppm, (1.91 - 2.99) ppm, (30.77 - 43.54) ppm, (8.23 - 21.91) mg/g, (4.99 - 6.33) ppm, (12.23 - 50.63) ppm, (1.53-2.43) ppm, (16.12 -20.55) ppm, (2.87 -5.22) ppm, (2.92 -3.84) ppm, (21.90-276.34) ppm, (13.25 -17.23) ppm, (59.98 - 91.90) mg/g, (17.84 - 30.68) ppm, (18.32 - 26.36) mg/g, (1.22 -2.26) ppm, (0.92 - 2.13) ppm, (31.73 - 260.90) ppm, (0.72 - 1.62) ppm. Almost all elements are below the toxicity level as well as in the reference in NOAA table

  4. Engineering high power induction plasma unit at BARC for mass synthesis of refractory nano-ceramics

    Atmospheric pressure RF thermal plasma sources are gaining increasing importance for production of high purity novel nano-materials in different high-end technological applications. Inherent electrode-less features of the discharge together with the large volume and high energy density of the produced plasma ensures contamination free process environment and mass production ability. Reported herewith is the development of an indigenous induction plasma system for mass synthesis of nanopowders of refractory ceramic materials. The system has been tested for continuous synthesis of Al2O3 nano-powder at a rate of more than 600 gm per hour and checked for its viability for bulk production of nano-particles of other refractory ceramics like Yttrium oxide and Neodymium Oxide. From collected evidences, the process of formation of the nano-particles is identified as the evaporation and subsequent homogeneous nucleation. Major features observed for alumina are complete conversion into highly spherical nano-sized particles, small particle sizes, very narrow size distribution, highly crystallite nature and mixed phases depending on the zone of collection. For alumina, the particles are found to exhibit a uni-modal distribution with peak near 15 nm

  5. Ultra high vacuum activities and required modification at 14 UD BARC-TIFR pelletron accelerator facility

    Full text: The 14 UD pelletron accelerator is working round the clock since 1989. The accelerator is housed inside a tank which is 6 meter in diameter and 25 meter long. The accelerator tank is pressurized with SF6 at 80 to 100 PSIG in order to achieve 14MV. In pelletron, ions are extracted from SNICS are pre-accelerated up to 300 keV before being injected into low energy accelerator tube. In the terminal which is at high potential (4MV to 14 MV), the ion beam pass through the stripper and positive ions with high charge states are produced. The high energy beams are focussed and analyzed by 90 deg magnet. The analyzed beam is then transported to the various experimental ports. In order to achieve uniform ultra high vacuum (to reduce the loss of intensity and spread in the energy of ions beams) in more than 100 metre and 100 mm diameter beam lines including magnet chambers and various beam diagnostic devices, combination of getter-ion pumps and turbo pumps are being used at Pelletron Accelerator Facility. The 14 UD pelletron is equipped with a combination of foil and gas stripper in high voltage terminal section. The foil and gas stripper in the terminal section are mainly used for stripping of light and heavy ions respectively. The gas stripper plays a great role for stripping of heavy ions and its efficiency depends on gas stripper parameters and supporting pumps. The gas stripper is originally installed with getter pumps. These pumps required periodic replacement of titanium cartridges and slowly the pumping speed used to diminish with time. A new recirculation turbo molecular pumps based system is being designed to improve good beam transmission. Details of design will be presented. Proton beam of tens of MeV energy and μA range current is in demand to carry out specific radiochemistry experiments in this facility. It is proposed to built and accommodate a proton experimental setup in the tower area of the existing facility. Details of required UHV system for the setup will be presented. Experiences with UHV systems, problems faced in vacuum field and future modification required in UHV system at 14 UD pelletron will be also presented

  6. Facility for testing and certification of medical x-ray films at BARC

    The major problem faced in the x-ray department with regard to x-ray films is the non consistent image quality of x-ray films leading to lesions missed/ wrong diagnosis and as a result retakes of the examination and increased radiation dosage to the patient. This report illustrates the methodology adopted by this Division towards implementation of quality assurance of the basic imaging devices namely the medical x-ray films. The characteristics properties desirable in x-ray films are the qualitative response of the emulsion to standard set of exposure and processing conditions in terms of speed, contrast and density. It should be consistent for exposure conditions in a custom built equipment simulating the quantum and type of energy that would be received by the film during diagnostic examinations. The phantom, geometrical set up and beam quality specifications as per the ISO standards required for x-ray sensitometry have been described in this report. (author)

  7. Development of 352.2 MHz cavity for RF coupler conditioning facility at BARC

    The power couplers used in RFQ and DTL cavities in LEHIPA are dumb bell shaped slots (iris) and two successive ridge wave guide sections which connects to a half height WR2300 waveguide and carries power from klystron. Each coupler is designed to transfer 250 kW power in continuous mode of operation at 352.2 MHz. After manufacturing and vacuum testing, each coupler has to be tested for its RF performance (coupling coefficient) and power handing capacity. High power RF conditioning facilities are being setup at IADD for LEHIPA couplers. RF conditioning facilities for 325 MHz and 650 MHz couplers are also being developed under Indian Institution Fermilab Collaboration (lIFC). A test cavity is developed to fulfill the requirement of a matched load in the conditioning set-up. The design is based on simple pillbox structure with required waveguide port, vacuum port, tuners and diagnostic ports. Water cooling is also provided to take away the dissipated power in the cavity. The cavity has been tested for any vacuum or water leaks. This paper elaborates the design, RF measurements on the test bench and manufacturing aspects of the cavity development. (author)

  8. Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre (BARC, Mumbai 400085, India

    Ashok Badigannavar


    Full Text Available Phytic acid is the major storage form of phosphorus in cereals. It binds with nutritionally important metals and affects mineral bioavailability. The present study analyzed phytic acid, inorganic phosphorus (IP content, seed weight, and grain yield in 98 sorghum landraces and varieties grown in two environments to evaluate genotypic and environmental effects and to determine trait stability. Genotypic effects and genotype × interaction were significant for phytic acid concentration and yield components. A promising landrace, Malkhed-1, had the lowest phytic acid (0.015 mg g− 1 concentration, with a higher yield (70.02 g plant− 1, than the check variety M-35-1 in both environments. Similarly, among the varieties, Phule Maulee showed the lowest phytic acid (0.07 mg g− 1 and a higher grain yield of 53.15 g plant− 1 in both environments. Phytic acid and IP were negatively correlated (r = − 0.34, whereas grain yield and seed weight were positively correlated (r = 0.20. Cluster analysis based on seed phosphorus traits and yield components identified five and six clusters, respectively. Genotypes containing low phytic acid with high yield identified in this study would be helpful for increasing the bioavailability of mineral nutrients.

  9. Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre (BARC), Mumbai 400085, India

    Ashok Badigannavar; Girish, G; T.R. Ganapathi


    Phytic acid is the major storage form of phosphorus in cereals. It binds with nutritionally important metals and affects mineral bioavailability. The present study analyzed phytic acid, inorganic phosphorus (IP) content, seed weight, and grain yield in 98 sorghum landraces and varieties grown in two environments to evaluate genotypic and environmental effects and to determine trait stability. Genotypic effects and genotype × interaction were significant for phytic acid concentration and yield...

  10. BARC-risk monitor- a tool for operational safety assessment in nuclear power plants

    Probabilistic safety assessment has become a key tool as on today to identify and understand nuclear power plant vulnerabilities. As a result of the availability of these PSA studies, there is a desire to use them to enhance plant safety and to operate the nuclear stations in the most efficient manner. Risk monitor is a PC based tool, which computes the real time safety level and assists plant personnel to manage day-to-day activities. Risk monitor is a PC based user friendly software tool used for modification and re-analysis of a nuclear power plant. Operation of risk monitor is based on PSA methods for assisting in day to day applications. Risk monitoring programs can assess the risk profile and are used to optimise the operation of nuclear power plants with respect to a minimum risk level over the operating time. This report presents the background activities of risk monitor, its application areas and also gives the status of such tools in international scenarios. The software is based on the PSA model of Kaiga generating station and would be applicable to similar design configuration. (author)

  11. BARC 2009 Annual Report TO NC-1037: Genetic and functional genomic approaches to improve production and quality of pork

    The NC-1037 project addresses “Genetic and functional genomic approaches to improve production and quality of pork.” It has 2 objectives: 1) Further understand the dynamic genetic mechanisms that influence production efficiency and quality of pork; and 2) Discover genetic mechanisms controlling anim...

  12. Radiation hazards control activities in BARC and other DAE units in Bombay and Indore: annual report 1994

    The radiation hazards control activities of units of Radiation Safety Systems Division stationed at different plants and facilities of Bhabha Atomic Research Centre and other units of Department of Atomic Energy in Bombay are briefly summarised. The activities are reported plantwise and include the following: (i) nature of radioactive operations, (ii) radiological status of the plant, (iii) personnel exposure data including collective and average exposures, (iv) effluent discharges, (v) waste disposal data, and (vi) safety related unusual occurrences and special problems, if any. Important operations for which extensive radiation safety surveillance was provided during the year 1994 are included. During the year 4319 persons were provided with radiation safety coverage at 25 different facilities. The collective dose and the average individual dose for the year 1994 are 6.08 man-Sv and 1.41 mSv respectively. Trends in personnel radiation exposure for a longer period i.e. from 1981 onwards are shown graphically. The figure also shows a steady trend in collective as well as average doses. The major contribution to dose comes from the following facilities: Plutonium Plant, Thorium Plant, Cirus, Radiological Laboratories and Dhruva in the decreasing order. (author). refs., tabs., 1 fig

  13. NLO QCD Corrections for $J/\\psi+ c + \\bar{c}$ Production in Photon-Photon Collision

    Chen, Zi-Qiang; Qiao, Cong-Feng


    The $\\gamma+\\gamma\\rightarrow J/\\psi+c+\\bar{c}$ inclusive process is an extremely important subprocess in $J/\\psi$ photoproduction, like at LEP\\uppercase\\expandafter{\\romannumeral2} or various types future electron-positron colliders. In this work we perform the next-to-leading(NLO) QCD corrections to this process in the framework of non-relativistic QCD(NRQCD) factorization formalism, the first NLO calculation for two projectiles to 3-body quarkonium inclusive production process. By setting the center-of-mass energy at LEP\\uppercase\\expandafter{\\romannumeral2}, the $\\sqrt{s}=197$ GeV, we conduct analyses of the $p_t^2$ distribution and total cross section of this process at the NLO accuracy. It turns out that the total cross section is moderately enhanced by the NLO correction with a $K$ factor of about 1.46, and hence the discrepancy between DELPHI data and color-singlet(CS) calculation is reduced while the color-octet(CO) contributions are still inevitable at this order. At the future Circular Electron-Pos...

  14. PLC-based control system for 10 MeV linear accelerator (LCS) at EBC Kharghar, BARC

    Currently the 10 MeV Linac is being used for different research and industrial applications. The control system in operation was developed using CAMAC based Data Acquisition System (DAS) and Hard-wired Interlock System. It is proposed to replace the CAMAC system with a state-of-the-art indigenously developed Programmable Logic Controller (PLC) that is verified to the level of a Class IB computer-based system used in nuclear power plants. A PLC node comprises of two VME bus based CPU boards (PowerPC MPC7447, 600MHz) working in redundant mode. The inputs and outputs are common to both CPUs. The I/O boards are hot swappable and intelligent. An intelligent Ethernet board is used for communication with a PC running the SCADA software and industry standard communication protocols drivers. The PLC hardware and software has undergone rigorous verification and validation. A user-friendly 'Application Development Environment' is provided to the process engineer for building the application using pre-defined function blocks. The LCS developed using PLC is to be used for operating the Linac irradiation facility, remotely as well as locally in a fail-safe mode, with sequential start-up and sequential shut-down. Apart from system status monitoring, data archiving, alarm generation and setpoint adjustments, it monitors the important parameters and trips the Gun Modulator High Voltage (GM HV), the Klystron Modulator High Voltage (KM HV) and the Electron Gun Power Supply (EG PS) on fault conditions. (author)

  15. Operating experience and radiation protection problems in the working of the radio-metallurgy hot cell facilities at BARC

    The Bhabha Atomic Research Centre at Bombay has six hot cell facilities for radiometallurgical investigations of irradiated/failed fuel elements. The hot cell facilities have been provided with certain built-in safety features, a ventilation system, radiation monitoring instruments for various purposes, a centralised air monitoring system and a central panel for display of various alarms. Procedures adopted for radiation protection and contamination control include : (1) radiation leak test for cells and filter efficiency evaluation before cell activation, (2) practices to be followed by frog suit personnel while working in hot cell areas, (3) receipt and handling of irradiated fuel elements, (4) cell filter change operation, (5) checks on high level drains and (6) effluent discharge and waste shipments. Operating experience in the working of these facilities along with radiation accident incidents is described. Data regarding release of activity during normal cell operations, dose rates during various metallurgical operations and personnel exposures are presented. (M.G.B.)

  16. Analysis of meteorological parameters and its impact on atmospheric dispersion of 41Ar plume at BARC site

    A study on atmospheric dispersion of 41Ar plume was carried out considering the influence of meteorological parameters at Bhabha Atomic Research Centre site. A comparative analysis has been presented taking into account of two different observation sessions. During normal operation of research reactors, 41Ar as activation product, is getting released (below authorized discharge limit) at Bhabha Atomic Research Centre site. The external exposure during the passage of the radioactive plume was estimated using measurement of radiation field by installing Gamma-tracers at different locations. To establish a correlation and to assess the plume behavior, meteorological data and dose rate data from Gamma-tracers was collected at the same time interval

  17. BARC 75 - A 75 group neutron-photon coupled cross-section library with P5- anisotropic scattering matrices

    A 75 group neutron-photon coupled cross-section library has been developed for 42 reactor nuclides utilizing the basic cross-section files - ENDF/B-IV for neutrons and DLC-7F for photons. 50 neutron energy groups and gamma energy groups are included in this library which should be well suited to carry out safety, shielding and core physics studies of nuclear reactors based on fission or fusion processes. This library is also adequate for oil logging and mineral exploration investigations. (author). 11 refs., 3 tabs

  18. Proceedings of BARC golden jubilee year DAE-BRNS topical symposium on role of analytical chemistry in nuclear technology

    Among the various disciplines in Chemistry, Analytical Chemistry is unique, because it is an integral part of every aspect of technology- product and process development and deployment. In Nuclear Industry, the quality assurance criteria are very stringent. And truly, Analytical Chemistry has continued to play a pivotal role in the entire nuclear fuel cycle, since the beginning of the Indian Atomic Energy Programme. The conference covers invited talk, nuclear materials, reactor systems, thorium technology, alternate energy sources, biology, agriculture and environment, water technology, isotope, radiation and laser technology, development of analytical instruments, and reference materials and inter-comparison exercises. Papers relevant to INIS are indexed separately. (author)

  19. Manpower Development to Support Indian Graduate Training School Program of BARC and its Incorporation in University System

    Conclusions: • Nuclear technology is multidisciplinary, knowledge intensive, and its education and training are constrained by unusual measures demanded by the concerns about radiation and nuclear safety, physical protection of nuclear materials and facilities, and safeguards to prevent diversion of nuclear material. • This requires vast faculty resources as also extraordinary and expensive infrastructure for conducting nuclear education making the task of human resource development in nuclear science and technology a challenging one. • The human resource for the nuclear energy programme in India so far has therefore been developed in-house in the DAE. • However, large requirement of manpower to take forward the growing nuclear energy programme in the country can be met only by extending concurrently the reach of the human resource development activity in nuclear science and technology. • The DAE is therefore supporting the university system in India, and integrating the existing training program with the university system. • It may be emphasized that nuclear education, being a means of preservation and transmission of explicit knowledge, is just one component of nuclear knowledge management (NKM). • The NKM also involves creation of mechanisms to preserve and transmit implicit and tacit knowledge

  20. Developmental studies on the process for preparation of thorium metal powder and optimization of process parameters: an in house effort in UED, BARC

    Thorium metal powder of purity more than 99% was prepared by the calciothermic reduction of thoria during the period of the first quarter of last calendar year. Oxygen content was found to be in the range of 1500-2000 ppm. The product thorium powder is silvery to grayish in appearance. Unlike uranium powder, thorium powder tends to have a rough surface and ragged edges. Thorium powder is less free flowing in nature as compared to that of uranium. In all accessible literature of the earlier studies, nitric acid has been used as leaching agent. As such thorium does not react with nitric acid but a trace of fluoride in nitric acid can initiate reaction. In the present study, however, acetic acid was used instead of nitric acid for leaching. It gives many edges over so far conventional nitric acid leaching e.g. (i) being organic it is less corrosive for the equipment, (ii) being mild in nature it is less aggressive to thorium powder, (iii) this will not pose problem of nitrate disposal in case of a scaled up production etc.

  1. Experience in maintenance of pumps in test facilities at R.E.D., B.A.R.C. [Paper No.: II-5

    Centrifugal pumps are used for circulating water in various test facilities which are meant for testing reactor components. Operating pressures are about 85 bars at 250 degC. Reciprocating pumps are used for make up service at pressures upto 160 bars. A primary heat transport pump for 200 MWe Candu type reactor, is being tested for checking its performance and for collection of base data. The following are discussed: (i) failure of hydrostatic seal and hydrostatic bearing and its causes, (ii) subsequent repairs and reconditioning, (iii) steps taken to avoid repetition of such failures, and (iv) problems in assembly. For a pump used in the fuelling machine test facility, following maintenance problems are discussed: (1) failure of various components like bearings, mechanical, seals, wear rings, etc., (2) causes of failure and steps taken to remedy the deficiencies noted, (3) experience with the indigenous antifriction bearings, and (4) experience with indigenous spiral wound gaskets. For the reciprocating pumps, leakage through gland packing is a problem. Experience with various types of packing and other parameters, affecting leakage are discussed. (author)

  2. Dr. Anil Kakodkar, Director, Bhabha Atomic Research Centre (BARC), Chairman-Designate of the Atomic Energy Commission Secretary, Department of Atomic Energy, India

    Patrice Loïez


    Photo 01: Dr. A. Kakodkar signing the Guest Book with Dr. L. Evans, LHC Project Leader and Prof. R. Cashmore, Director for Collider Programmes Photo 02: Dr. A. Kakodkar with Dr. L. Evans Photo 03: Dr. A. Kakodkar

  3. Radiation protection during inventory control of radium needles at SSKM Hospital, Kolkata, for the purpose of safe disposal at BARC, Mumbai

    The present article describes the job undertaken in a hospital with particular reference to handling of the radium needles, leakage and contamination check, packaging, labeling and marking for safe transportation and disposal

  4. The decays $h^0 \\to b \\bar{b}$ and $h^0 \\to c \\bar{c}$ in the light of the MSSM with quark flavour violation

    Eberl, H; Bartl, A; Hidaka, K; Majerotto, W


    We calculate the decay width of h0 -> b bbar in the Minimal Supersymmetric Standard Model (MSSM) with quark flavour violation (QFV) at full one-loop level. We study the effect of scarm-stop mixing and sstrange-sbottom mixing taking into account the constraints from the B meson data. We discuss and compare in detail the decays h0 -> c cbar and h0 -> b bbar within the framework of the perturbative mass insertion technique using the Flavour Expansion Theorem. The deviation of both decay widths from the Standard Model values can be quite large. Whereas in h0 -> c cbar it is almost entirely due to the flavour violating part of the MSSM, in h0 -> b bbar it is mainly due to the flavour conserving part. Nevertheless, the QFV contribution to Gamma(h0 -> b bbar) due to scarm-stop mixing and chargino exchange can go up to about 8%.

  5. Field trials of sugarcane mutants developed by B.A.R.C., Trombay (Bombay) Under different agro-climatic conditions in Maharashtra

    TS-1 and TS-8 are two thick cane type sugarcane mutants developed from bud setts of sugarcane variety Co-419 by treating it with 2 Krad gamma radiation. Field trials of these mutants were carried out in different regions of Maharashtra State (India). Data collected with respect to germination, number and length of internodes, cane girth, cane weight, plant height and juice quality at 6, 7, 8 and 11 months are presented. The mutants showed superiority with respect to cane girth, cane weight and juice quality as compared to those of Co-740 variety predominantly grown in Maharashtra state. (M.G.B.)

  6. BIPM comparison BIPM.RI(II)-K1.Zn-65 of activity measurements of the radionuclide 65Zn for the BARC (India) with linked results for the CCRI(II)-K2.Zn-65 comparison

    A new participation in the BIPM.RI(II)-K1.Zn-65 comparison has been added to the previous results. A link has been made to the CCRI(II)-K2.Zn-65 comparison held in 2003 through the measurement of all ampoules of the K2 comparison in the International Reference System (SIR) at the BIPM before despatch to the participants. This has produced a revised value for the key comparison reference value (KCRV), calculated using the power-moderated weighted mean. Six NMIs used the K2 comparison to update their degree of equivalence. The degrees of equivalence between each equivalent activity measured in the International Reference System (SIR) and the KCRV have been calculated and the results are given in the form of a table for the remaining two NMIs in the BIPM.RI(II)-K1.Zn-65 comparison and the 17 other participants in the CCRI(II)-K2.Zn-65 comparison. A graphical presentation is also given. (authors)

  7. Information systems in the field of nuclear science and technology, with special reference to Library and Information Services of BARC and its role in the development of atomic energy for peaceful purposes in India

    Information systems in the field of nuclear science and technology are described. A detailed description is given of the various services and activities of : (1) the Centre for Documentation (CID) of the EURATOM and (2) The Technical Information Program of the USERDA. The objectives and operation of the International Nuclear Information Systems (INIS) established by the IAEA are discussed. The information needs in the field of nuclear science and technology in India are met by the Library and Information Services (L and IS) of the Bhabha Atomic Research Centre, Bombay. Its various library facilities, documentation and information services are described in detail. It also acts as the INIS inputting centre for Indian nuclear literature. (M.G.B.)

  8. A study on effect of point-of-use filters on defect reduction for advanced 193nm processes

    Vitorino, Nelson; Wolfer, Elizabeth; Cao, Yi; Lee, DongKwan; Wu, Aiwen


    Bottom Anti-Reflective Coatings (BARCs) have been widely used in the lithography process for decades. BARCs play important roles in controlling reflections and therefore improving swing ratios, CD variations, reflective notching, and standing waves. The implementation of BARC processes in 193nm dry and immersion lithography has been accompanied by defect reduction challenges on fine patterns. Point-of-Use filters are well known among the most critical components on a track tool ensuring low wafer defects by providing particle-free coatings on wafers. The filters must have very good particle retention to remove defect-causing particulate and gels while not altering the delicate chemical formulation of photochemical materials. This paper describes a comparative study of the efficiency and performance of various Point-of-Use filters in reducing defects observed in BARC materials. Multiple filter types with a variety of pore sizes, membrane materials, and filter designs were installed on an Entegris Intelligent(R) Mini dispense pump which is integrated in the coating module of a clean track. An AZ(R) 193nm organic BARC material was spin-coated on wafers through various filter media. Lithographic performance of filtered BARCs was examined and wafer defect analysis was performed. By this study, the effect of filter properties on BARC process related defects can be learned and optimum filter media and design can be selected for BARC material to yield the lowest defects on a coated wafer.

  9. Improved determination of the $D \\to K^-\\pi^+\\pi^+\\pi^-$ coherence factor and associated hadronic parameters from a combination of $e^+e^-\\to \\psi(3770)\\to c\\bar{c}$ and $pp \\to c \\bar{c} X$ data

    Evans, T; Libby, J; Malde, S; Rademacker, J; Wilkinson, G


    Measurements of the coherence factor $R_{K3\\pi}$, the average strong-phase difference $\\delta^{K3\\pi}_D$ and mean amplitude ratio $r_D^{K3\\pi}$ for the decay $D \\to K^-\\pi^+\\pi^+\\pi^-$ are presented. These parameters are important inputs to the determination of the unitarity triangle angle $\\gamma$ in $B^- \\to DK^-$ decays, where $D$ designates a superposition of $D^0$ and $\\bar{D}{}^0$ mesons decaying to a common final state. The results are based on a combined fit to observables obtained from a re-analysis of the CLEO-c $\\psi(3770)$ data set and those measured in a $D^0\\bar{D}^0$ mixing study performed by the LHCb collaboration.

  10. Thin film type 248-nm bottom antireflective coatings

    Enomoto, Tomoyuki; Nakayama, Keisuke; Mizusawa, Kenichi; Nakajima, Yasuyuki; Yoon, Sangwoong; Kim, Yong-Hoon; Kim, Young-Ho; Chung, Hoesik; Chon, Sang Mun


    A frequent problem encountered by photoresists during the manufacturing of semiconductor device is that activating radiation is reflected back into the photoresist by the substrate. So, it is necessary that the light reflection is reduced from the substrate. One approach to reduce the light reflection is the use of bottom anti-reflective coating (BARC) applied to the substrate beneath the photoresist layer. The BARC technology has been utilized for a few years to minimize the reflectivity. As the chip size is reduced to sub 0.13-micron, the photoresist thickness has to decrease with the aspect ratio being less than 3.0. Therefore, new Organic BARC is strongly required which has the minimum reflectivity with thinner BARC thickness and higher etch selectivity towards resist. SAMSUNG Electronics has developed the advanced Organic BARC with Nissan Chemical Industries, Ltd. and Brewer Science, Inc. for achieving the above purpose. As a result, the suitable high performance SNAC2002 series KrF Organic BARCs were developed. Using CF4 gas as etchant, the plasma etch rate of SNAC2002 series is about 1.4 times higher than that of conventional KrF resists and 1.25 times higher than the existing product. The SNAC2002 series can minimize the substrate reflectivity at below 40nm BARC thickness, shows excellent litho performance and coating properties.

  11. Process and performance optimization of bottom antireflective coatings: II

    Ding, Shuji; Sagan, John P.; Shan, Jianhui; Gonzalez, Eleazar; Dixit, Sunit S.; Liu, Ying; Khanna, Dinesh N.


    The newly developed AZ BARLi II coating material is a photoresist solvent-based bottom antireflective coating (BARC) for i-line lithographic application. The coating material has good compatibility with common edge bead removal solvents such as ethyl lactate, PGME, or PGMEA mixed with ethyl lactate or PGME. To evaluate the BARC material, its chemical compatibility with common EBR solvents has been tested by several analytical techniques including liquid particle counts and surface defect studies. Both top and bottom EBR dispense processes have been investigated and optimized. Improvements on edge roughness, visual cleanliness, and the BARC coating buildup at the edge will be discussed in this paper.

  12. Novel conformal organic antireflective coatings for advanced I-line lithography

    Deshpande, Shreeram V.; Nowak, Kelly A.; Fowler, Shelly; Williams, Paul; Arjona, Mikko


    Flash memory chips are playing a critical role in semiconductor devices due to increased popularity of hand held electronic communication devices such as cell phones and PDAs (personal Digital Assistants). Flash memory offers two primary advantages in semiconductor devices. First, it offers flexibility of in-circuit programming capability to reduce the loss from programming errors and to significantly reduce commercialization time to market for new devices. Second, flash memory has a double density memory capability through stacked gate structures which increases the memory capability and thus saves significantly on chip real estate. However, due to stacked gate structures the requirements for manufacturing of flash memory devices are significantly different from traditional memory devices. Stacked gate structures also offer unique challenges to lithographic patterning materials such as Bottom Anti-Reflective Coating (BARC) compositions used to achieve CD control and to minimize standing wave effect in photolithography. To be applicable in flash memory manufacturing a BARC should form a conformal coating on high topography of stacked gate features as well as provide the normal anti-reflection properties for CD control. In this paper we report on a new highly conformal advanced i-line BARC for use in design and manufacture of flash memory devices. Conformal BARCs being significantly thinner in trenches than the planarizing BARCs offer the advantage of reducing BARC overetch and thus minimizing resist thickness loss.

  13. Recombinant lines for less-spininess in steroid-bearing Solanum viarum using induced mutants as parents

    In the domestication of the wild, spinous and steroid-bearing Solanum viarum (syn. S. khasianum var. chatterjeeanum) induced mutations play a major role. The development of Glaxo and BARC mutants catalysed commercial cultivation of this species for its berries containing solasodine, used in steroid industries. The commercially more popular Glaxo mutant population consists predominantly of plants that are totally free of spines in aerial parts except lamina where few straight spines develop. The BARC mutant still possesses spines on aerial parts including the persistent calyx. However, the laminary spines of the BARC mutant are curved and vestigial. Comparative studies on morphology, growth behaviour and agronomic characters of the two mutants, their wild progenitor and their hybrid progenies showed that the three types differ only for spine character. In F2 generation of a cross involving the Glaxo and BARC mutants, a double mutant recombinant was recovered. The recombinant is devoid of spines in aerial parts like its Glaxo mutant parent, but possesses laminary curved vestigial spines like the BARC parent. The spine characters of the recombinant are inherited double recessive. Three advanced lines of this recombinant type (IIHR 2n - 1,2 and 3) were tested in replicated trials 1985 and 1986. They showed parity in berry yield and solasodine content with the Glaxo mutant and three promising lines evolved elsewhere viz. 'RRL (Bhuhaneswar) Y-14', 'RRL (Jorhat)' and 'Pusa'. The results indicate gainful use of induced mutants in hybridization leading to development of superior less-spiny lines of steroid bearing Solanum viarum

  14. Investigation of NPP behavior in case of loss of coolant accident based on comparison of different ASTEC computer code versions

    The paper presents the work performed at the Institute for Nuclear Research and Nuclear Energy (INRNE) and Bhabha Atomic Research Centre (BARC), India in the frame of SARNET2 project. The performed work continues the effort in the field of nuclear safety and cooperation between INRNE-BAS and BARC. The main target is development and validation of ASTEC (Accident Source Term Evaluation Code) at the further, a tool for level-2 PSA analysis for better understanding of accident progression during in-vessel phase until reactor vessel failure. (authors)

  15. Intrinsic charm content of the nucleon and charmness-nucleon sigma term

    Duan, Shaorong; Saghai, B


    In the extended chiral constituent quark model, the intrinsic $c \\bar{c}$ content of the nucleon is investigated. The probabilities of the quark-antiquark components in the nucleon wave functions are calculated by taking the nucleon to be admixtures of three- and five-quark components, with the relevant transitions handled {\\it via} the $^{3}$P$_{0}$ mechanism. Predictions for the probability of the $c \\bar{c}$ in the nucleon wave function and the charmness-nucleon sigma term are presented. Our numerical results turn out to be consistent with the predictions from various other approaches reported in the literature.

  16. Appendix XVIII: 'Batch' approach to new employee entry and some other training schemes of DAE

    Nuclear Power Corporation of India Ltd. - NPCIL is Government of India Enterprise under Department of Atomic Energy engaged in Design, Construction and Operation activities of Nuclear Power Plants. The Department of Atomic Energy (DAE) of India has a long running induction training programme run by the Human Resource Division of Bhabha Atomic Research Center (BARC) also known as BARC Training School. This is considered a unique and valuable scheme to impart nuclear knowledge towards meeting the goals of DAE and constitutes one of the important knowledge management activities. This and other training schemes of DAE are presented

  17. Wet-recess process optimization of a bottom antireflective coating for the via-first dual-damascene scheme

    Brakensiek, Nickolas L.; Kidd, Brian; Washburn, Carlton A.; Murphy, Earnest


    The via-first process is unique by the fact that a material is needed to fill the vias to some arbitrary value, with little or no isolated-dense via bias so that the underlying layer underneath the via is protected from the trench etch step. Secondly, this material may have to coat over the surface of the wafer with some chosen thickness again with minimum or no bias to maximize the trench photolithography process window. Finally, the material must be easily removed from the via after the trench etch with no residue, crowning, or fencing. The ideal via fill material would be able to perform all the above listed parameters, but no perfect solution exists yet. The etchback process that is discussed herein, called the solvent etchback (SOLVE) process bypasses these lengthy modules, will fit within today"s manufacturing processes and will have little impact on throughput of the photobay coating tools. The process utilizes industry standard photoresists solvents such as PGMEA, Ethyl Lactate, PGME and existing solvent prewet dispense nozzles in the BARC coater module. Also, this process only requires one material that can both fill the via and act as a BARC during the trench photo step with a user defined thickness on top the wafer that will minimize light reflections coming from the substrate. The process flow for the SOLVE process is: 1. Coat a wafer with a thick BARC to planarize the wafer and minimize isolated-dense bias. 2. Bake the BARC so that it is partially crosslinked. 3. Apply a solvent to the wafer and etchback the BARC to a thickness that suits the trench photo step. 4. Bake the BARC to fully crosslink the BARC. Process variables that can have an affect on the SOLVE process are the softbake temperature and time to modify the BARC thickness on the wafer. Dispense parameters that will modify the post-etch uniformity of the wafer include the dispense time, dispense spin speed and the IDI M450 dispense pressure. The repeatability of the process can be modified

  18. AMS using 14UD Pelletron at TIFR, Mumbai: present status and future prospects

    The AMS (Accelerator Mass Spectrometry) is a versatile tool employed in multidisciplinary programmes. The AMS programme at the BARC-TIFR 14UD Pelletron accelerator has been initiated with major emphasis on the determination of 36Cl concentration in environment in general and water samples in particular. Preliminary measurements related to detection of 129I have been carried out in recent past. The system used for AMS measurement is based on a 14 MV Tandem Accelerator. In this paper, the status and future prospects of AMS programme at BARC-TIFR Pelletron Accelerator Facility are presented

  19. Indigenous development of nuclear instrumentation

    Electronics Division, BARC has a long tradition of developing detectors, nuclear instrumentation modules and systems which have been exploited in many large scale experiments in DAE. Much of this technology has been transferred to industry. Recent developments emphasise high density and low power consumption. Latest devices such as FPGAs and indigenously developed hybrid microcircuits and ASICs have been used towards this end. (author)

  20. Simulation results of liquid and plastic scintillator detectors for reactor antineutrino detection - A comparison

    Kashyap, V. K. S.; Pant, L. M.; Mohanty, A. K.; Datar, V. M.


    A simulation study of two kinds of scintillation detectors has been done using GEANT4. We compare plastic scintillator and liquid scintillator based designs for detecting electron antineutrinos emitted from the core of reactors. The motivation for this study is to set up an experiment at the research reactor facility at BARC for very short baseline neutrino oscillation study and remote reactor monitoring.


    Biegun, Aleksandra


    The study of the charmonium ((c) over barc) system is a powerful tool to understand the strong interaction. In (p) over barp annihilations studied with PANDA, the mass and width of the charmonium state, such as h(c), will be measured with an excellent accuracy, determined by the very precise knowled

  2. Radiation dosage

    Radiation dosage at Bikini Atoll is the result of current soil contamination, a relic of the nuclear weapons testing program of some 30 years ago. The principal contaminants today and some of their physical properties are listed: cesium-137, strontium-90, plutonium -239, 240 and americium-241. Cobalt-60 contributes less than 1 to the dose and is not considered significant. A resident of the atoll would accumulate radiation dose (rem) in two ways -- by exposure to radiation emanating from the ground and vegetation, and by exposure to radiation released in the spontaneous decay of radionuclides that have entered his body during the ingestion of locally grown foods. The latter process would account for some 90% of the dose; cesium-137 would be responsible for 0 90% of it. Since BARC's method of estimating dosage differs in some respects from that employed by the Lawrence Livermore National Laboratory (LLNL), (Ref.1, LLNL 1982) we are presenting our method in detail. The differences have two sources. First, the numbers used by BARC for the daily ingestion of radionuclides via the diet are higher than LLNL's. Second, BARC's calculation of dose from radionuclide intake utilizes the ICRP system. The net result is that BARC doses are consistently higher than LLNL doses, and in this respect are more conservative

  3. Studies on the bioaccumulation of As, Cu, Se, Zn and Ga radionuclides by different algal genera

    The bio-sorption of different elements, e.g., Cu, Zn, As, Se and Ga by algal genera from different taxonomic groups were experimentally studied employing recently developed tracer packet technique. The radionuclides, 61Cu, 62,63Zn, 66,67,68Ga, 71,72As and 73Se were produced by heavy ion activation in BARC-TIFR pelletron. (author)

  4. Heavy quark symmetry and weak decays of the $b$-baryons in pentaquarks with a $c\\bar{c}$ component

    Ali, Ahmed; Aslam, M Jamil; Rehman, Abdur


    The discovery of the baryonic states $P_c^+(4380)$ and $P_c^+(4450)$ by the LHCb collaboration has evoked a lot of theoretical interest. These states have the minimal quark content $c \\bar{c} u u d$. Interpreted as hidden charm diquark-diquark-antiquark baryons, the assigned spin and angular momentum quantum numbers are $P_c^+(4380)= \\{\\bar{c} [cu]_{s=1} [ud]_{s=1}; L_{\\mathcal{P}}=0, J^{\\rm P}=\\frac{3}{2}^- \\}$ and $P_c^+(4450)= \\{\\bar{c} [cu]_{s=1} [ud]_{s=0}; L_{\\mathcal{P}}=1, J^{\\rm P}=\\frac{5}{2}^+ \\}$, where $s=0,1$ are the spins of the diquarks and $L_{\\mathcal{P}}=0,1$ are the orbital angular momentum quantum numbers of the pentaquarks. We point out that heavy quark symmetry allows only the higher mass pentaquark state $P_c^+(4450)$ having $[ud]_{s=0}$ to be produced in $\\Lambda_b^0$ decays, whereas the lower mass state $P_c^+(4380)$ having $[ud]_{s=1}$ is disfavored. Pentaquark spectrum is rich enough to accommodate a $J^P=\\frac{3}{2}^-$ state, which has the correct light diquark spin $\\{\\bar{c} [cu...

  5. 7 CFR 502.9 - Soliciting, vending, debt collection, and distribution of handbills.


    ... display or distribution of commercial advertising, or the collecting of private debts, in or on BARC... 7 Agriculture 6 2010-01-01 2010-01-01 false Soliciting, vending, debt collection, and distribution... PROPERTY, BELTSVILLE, MARYLAND § 502.9 Soliciting, vending, debt collection, and distribution of...

  6. Advances in ultrafiltration membrane technology for water purification and effluent treatment

    This paper aims at presenting the advances made in ultrafiltration (UF) membrane separation technology with an emphasis on the potential areas of its applications and some of R and D works carried out in this direction in our laboratory in BARC. (author)

  7. Simulation results of liquid and plastic scintillator detectors for reactor antineutrino detection - A comparison

    A simulation study of two kinds of scintillation detectors has been done using GEANT4. We compare plastic scintillator and liquid scintillator based designs for detecting electron antineutrinos emitted from the core of reactors. The motivation for this study is to set up an experiment at the research reactor facility at BARC for very short baseline neutrino oscillation study and remote reactor monitoring

  8. Online Decision Support System (IRODOS) - an emergency preparedness tool for handling offsite nuclear emergency

    A real time online decision support system as a nuclear emergency response system for handling offsite nuclear emergency at the Nuclear Power Plants (NPPs) has been developed by Health, Safety and Environment Group, Bhabha Atomic Research Centre (BARC), Department of Atomic Energy (DAE) under the frame work of 'Indian Real time Online Decision Support System 'IRODOS'. (author)

  9. Polarization measurements in K+n charge exchange at 6 and 12 GeV/c

    The polarization in K+n→K0p has been measured at 6 and 12 GeVvertical-barc in the interval 0.1< vertical-bartvertical-bar<1.0 using a polarized deuteron target. The results are compared to predictions from SU(3), EXD and line reversal, and from vari ous phenomenological models

  10. Health physics surveillance during recovery of 233U from irradiated thorium rods at reprocessing development lab, IGCAR

    Second campaign for the recovery of 233U from the irradiated rods from CIRUS and DHRUVA reactors at BARC, was carried out successfully at Reprocessing Development Laboratory (RDL) at Indira Gandhi Centre for Atomic Research (IGCAR). Health physics surveillance was provided all through the operation. The operational radiation protection methods followed and the experience gained during the campaign are discussed in this paper. (author)

  11. Improved cathode assembly for electron gun of 7 MeV linac

    This Electron Beam Linear Accelerator (LINAC) of RPCD, BARC is the key component of the pulse radiolysis facility being used for radiation chemistry research. The heart of the LINAC is the electron gun, which generates electron from a tungsten cathode. Recently an improved cathode assembly is designed and fabricated for better performance of the linac. (author)

  12. Dicty_cDB: VFC544 [Dicty_cDB

    Full Text Available VF (Link to library) VFC544 (Link to dictyBase) - G02521 DDB0187174 Contig-U14739-1 VFC544P (Lin ... complete cds. 48 0.30 1 CC453888 |CC453888.1 BARC-Sat _362 Size-selected soybean genomic Glycine max geno ...

  13. Dicty_cDB: Contig-U05770-1 [Dicty_cDB

    Full Text Available Contig-U05770-1 no gap 474 4 1664755 1665230 PLUS 1 1 U05770 0 0 0 0 0 0 1 0 0 0 0 0 0 0 Show Co ... 2-15e9, complete seq... 38 2.8 3 ( CC453768 ) BARC-Sat _229 Size-selected soybean genomic Glycin... 36 2.9 ...

  14. Dicty_cDB: Contig-U06432-1 [Dicty_cDB

    Full Text Available Contig-U06432-1 no gap 331 5 4675822 4675488 MINUS 1 1 U06432 1 0 0 0 0 0 0 0 0 0 0 0 0 0 Show C ... ays genomic clone ZM... 44 3.0 1 ( CC453780 ) BARC-Sat _242 Size-selected soybean genomic Glycin... 44 3.0 ...

  15. Successful test flight of an airship


    @@ Researchers with the Balloon Aircraft Research Center (BARC) of the Academy of Opto-electronics, CAS, succeeded in their first test flight of an aeroboat with a flight altitude up to 1,000 meters and an effective payload of 20 kilograms in Shandong on 25 December, 2007.

  16. 7 CFR 502.6 - Hunting, fishing, camping, horseback riding.


    ... 7 Agriculture 6 2010-01-01 2010-01-01 false Hunting, fishing, camping, horseback riding. 502.6..., MARYLAND § 502.6 Hunting, fishing, camping, horseback riding. The use of BARC grounds for any form of hunting, fishing, camping, or horseback riding is prohibited. Further, the use of these grounds...

  17. Testing low cost anaerobic digestion (AD) systems

    To evaluate the potential for low technology and low cost digesters for small dairies, BARC and researchers from the University of Maryland installed six modified Taiwanese-model field-scale (FS) digesters near the original dairy manure digester. The FS units receive the same post-separated liquid ...

  18. Effector-Triggered Immunity Determines Host Genotype-Specific Incompatibility in Legume-Rhizobium Symbiosis.

    Yasuda, Michiko; Miwa, Hiroki; Masuda, Sachiko; Takebayashi, Yumiko; Sakakibara, Hitoshi; Okazaki, Shin


    Symbiosis between legumes and rhizobia leads to the formation of N2-fixing root nodules. In soybean, several host genes, referred to as Rj genes, control nodulation. Soybean cultivars carrying the Rj4 gene restrict nodulation by specific rhizobia such as Bradyrhizobium elkanii We previously reported that the restriction of nodulation was caused by B. elkanii possessing a functional type III secretion system (T3SS), which is known for its delivery of virulence factors by pathogenic bacteria. In the present study, we investigated the molecular basis for the T3SS-dependent nodulation restriction in Rj4 soybean. Inoculation tests revealed that soybean cultivar BARC-2 (Rj4/Rj4) restricted nodulation by B. elkanii USDA61, whereas its nearly isogenic line BARC-3 (rj4/rj4) formed nitrogen-fixing nodules with the same strain. Root-hair curling and infection threads were not observed in the roots of BARC-2 inoculated with USDA61, indicating that Rj4 blocked B. elkanii infection in the early stages. Accumulation of H2O2 and salicylic acid (SA) was observed in the roots of BARC-2 inoculated with USDA61. Transcriptome analyses revealed that inoculation of USDA61, but not its T3SS mutant in BARC-2, induced defense-related genes, including those coding for hypersensitive-induced responsive protein, which act in effector-triggered immunity (ETI) in Arabidopsis. These findings suggest that B. elkanii T3SS triggers the SA-mediated ETI-type response in Rj4 soybean, which consequently blocks symbiotic interactions. This study revealed a common molecular mechanism underlying both plant-pathogen and plant-symbiont interactions, and suggests that establishment of a root nodule symbiosis requires the evasion or suppression of plant immune responses triggered by rhizobial effectors. PMID:27373538

  19. Report on R and D activities of Health Physics Division 1984 - 1985

    A summary of the research and development programmes undertaken in Health Physics Division during the period 1984-1985 is contained in the report. The details of the various investigations are given in references listed under each abstract, most of which are published in the form of papers in symposia and journals or as BARC reports. Some of the investigations have been carried out in collaboration with other Divisions of BARC and outside organisations. A list of these leading to M.Sc./Ph.D Degrees submitted by members of the Division is given at the end. The Division has also a number of research contracts with IAEA. A summary of work carried out under these projects is included in a separate section. (author)

  20. Radiation synthesis of low swelling acrylamide based hydrogels and determination of average molecular weight between cross-links

    A comparative analysis of determination of cross-link density (νe) of hydrogels by using swelling tests and mechanical measurements has been made. Poly(acrylamide/methacrylamide) P(AAm/MAAm) and poly(acrylamide/hydroxyethyl methacrylate) P(AAm/HEMA) hydrogels were prepared by using gamma rays and used as model hydrogel systems. The uniaxial compression test was applied to cylindrical gel samples in the swollen state at pH 7. Stress-strain curves of hydrogels were evaluated to calculate the shear modulus values. The average molecular weight between cross-links (M-barc) and νe obtained from mechanical measurements were significantly different than the values obtained from swelling experiments. Large differences were attributed to the uncertainty on the value of the χ parameter used in the Flory-Rehner equation. ±1% change in this parameter doubled or reduced the M-barc value of hydrogel to half value

  1. Prototype development of filter monitor for 131I processing plant

    Iodine-131 (131I) is used extensively in nuclear medicine because of its short half-life and useful beta emission. Isotope Production and Applications Division (IP and AD) of BARC produces 131I in its processing plant. The charcoal filters that are capable of extracting high levels of radioactive iodine and particulates in the suction flow are installed in the plant. The radioactive iodine is fully removed and deposited onto activated charcoal impregnated with potassium iodide. These charcoal filters get saturated over a period of use and need to be replaced with fresh ones. A 5-channel Filter monitor for online measurement of radiation level of trapped 131I on the charcoal filter is being developed by IP and AD, BARC. The unavailability of this type of instrument motivated to undertake this development. Current paper deals with a prototype filter monitor developed with single detector. Some results prove the functionality of the system. (author)

  2. Technology transfer from nuclear research

    A number of processes, components and instruments developed at the Bhabha Atomic Research Centre, (BARC), Bombay, find application in industry and are available for transfer to private or public sector undertakings for commercial exploitation. The Technology Transfer Group (TTG) constituted in January 1980 identifies such processes and prototypes which can be made available for transfer. This catalogue contains brief descriptions of such technologies and they are arranged under three groups, namely, Group A containing descriptions of technologies already transferred, Group B containing descriptions of technologies ready for transfer and Group C containing descriptions of technology transfer proposals being processed. The position in the above-mentioned groups is as on 1 March 1989. The BARC has also set up a Technology Corner where laboratory models and prototypes of instruments, equipment and components are displayed. These are described in the second part of the catalogue. (M.G.B.)

  3. Parametric thermal analysis of 75 MHz heavy ion RFQ

    An ECR based Heavy Ion Accelerator comprising of a superconducting Electron Cyclotron Resonance (ECR) Ion Source, normal conducting RFQ (Radio Frequency Quadrupole) and superconducting Niobium resonators is being developed at BARC under XII plan. A state-of-the-art 18 GHz superconducting ECR ion source (PK-ISIS) jointly configured with Pantechnik, France is operational at Van-de-Graaff, BARC. The electromagnetic design of the improved version of 75 MHz heavy ion RFQ has been reported earlier. The previous thermal study of 51 cm RFQ model showed large temperature variation axially along the vane tip. A new coolant flow scheme has been worked out to optimize the axial temperature gradient. In this paper the thermal analysis including parametric study of coolant flow rates and inlet temperature variation will be presented. (author)

  4. Research and development activities of the Seismology Section for the period January 1982-December 1983

    The research and development activities of the Seismology Section of the Bhabha Atomic Research Centre (BARC) at Bombay are reported for the period January 1982-December 1983 in the form of summaries. The Section's activities are mainly directed towards detection of underground nuclear explosions. During the report period 64 signals out of about 12000 seismograms which were examined were identified as the signals due to underground nuclear explosions. The instrumentation work for Kolar rockburst research was almost completed under the collaboration programme of BARC with Bharat Gold Mines Ltd. Analytical methods have been developed for interpreting the frequency-magnitude relation of earthquake. These methods will be useful in the seismic estimation of risk in case only restricted data involving events of low magnitude are available. A list of publications of the staff-members of the Section during the report period is given. (M.G.B.)

  5. Operating experience of upgraded radio frequency source at 76 MHz coupled to heavy ion RFQ

    A heavy ion radio frequency quadrupole (RFQ) accelerator has been developed at BARC (BARC). A RF source which was designed and developed at 76 MHz earlier, has been upgraded and coupled to heavy ion RFQ successfully. The DC bias supplies of this source have been replaced with new supplies having high efficiency and well filteration against RF interference (RFI). The driver of main power amplifier has been replaced with indigenously designed and developed unit. The earlier introduced microcontroller based interlock experienced RF noise issues. So, this circuit has been modified with the new circuit. With these modifications, the performance of the RF source was improved. Additionally, a separate low power RF source of around 100+ Watt was designed, developed and integrated with RFQ for its RF conditioning. This paper describes the details of up gradation of technologies implemented and coupling experience of this RF source with heavy ion RFQ. (author)

  6. Radiation technology in agriculture

    The Department of Atomic Energy through its research, development and deployment activities in nuclear science and technology, has been contributing towards enhancing the production of agricultural commodities and their preservation. Radiations and radioisotopes are used in agricultural research to induce genetic variability in crop plants to develop improved varieties, to manage insect pests, monitor fate and persistence of pesticides, to study fertilizer use efficiency and plant micronutrient uptake and also to preserve agricultural produce. Use of radiation and radioisotopes in agriculture which is often referred to as nuclear agriculture is one of the important fields of peaceful applications of atomic energy for societal benefit and BARC has contributed significantly in this area. 41 new crop varieties developed at BARC have been released and Gazette notified by the MoA, GOI for commercial cultivation and are popular among the farming community and grown through out the country

  7. Progress report [of] Technical Physics and Prototype Engineering Division, April 1982 - March 1984

    The work done by the Technical Physics and Prototype Engineering Division of the Bhabha Atomic Research Centre (BARC) at Bombay during the period from April 1982 to March 1984 is described in the form of summaries. The main thrust of the work of the Division is towards designing, developing, fabricating and if needed, producing on a large scale various instruments, equipment and components required for the programmes of the BARC and the Department of Atomic Energy. The summaries describing the work are grouped under the headings:(1) vacuum, (2) surface analysis, (3) mass spectrometry, (4) electronics, (5) cryogenics, (6) crystals and detectors, (7) glass technology and devices, and (8) optoelectronics. A list of publications of the staff-members of the Division during the report period is given. (M.G.B.)

  8. Indigenous development of mass spectrometers : Part-I - development of magnetic sector instruments with EI And TI sources. PD-5-2

    Mass spectrometry is an indispensable analytical technique for high precision isotopic ratio analysis of materials, trace and ultra trace impurity analysis and also compositional studies. Whereas magnetic sector instruments are best suited for the isotopic analysis, quadrupole based systems are routinely used for compositional analysis and ultra trace analysis. BARC has been developing these mass spectrometers for various departmental users covering the entire analytical application range. An overview of these developments has been presented elsewhere in this volume. There has been a growing demand from the users for enhanced performance of these instruments and efforts are going on at VPID, in BARC towards meeting these demands. The present paper describes the recent development of magnetic sector instruments and some results obtained on these machines. The presentation covers: (1) development of TIMS for U and Pu, (2) TIMS for Boron analysis with an optional EI source change over and (3) process gas MS for UF6 analysis and D/H machines

  9. IAEA/RCA external dosimetry intercomparison (1995-97)

    IAEA/RCA personal dosimeters intercomparison of external radiation was conducted by JAERI during the year 1995-1997. 17 countries using 38 types of personnel dosimeters participated in this intercomparison. Out of 38 dosimetry systems 26 used TLD, 10 film badge and 2 RPL dosimeters. Our laboratory participated with BARC personal dosimeter badge using TLD (CaSO4:Dy). Reference calibration source check of the participating laboratories was done using RPL glass dosimetry by JAERI. The dosimeters of the participants were exposed to ISO x-ray beams and γ sources to low and moderate doses during phase 1 and to mixed x-ray beams, mixed x-γ radiation, non-perpendicular radiation and x and γ radiation separately in phase 2. The participant laboratories estimated the values of the exposures given in terms of operational quantities. The results of BARC/TLD badge are presented and compared with respect to other laboratories. (author)

  10. Development of a thermoluminescent personnel monitoring system

    Thermoluminescent personnel monitoring system has been developed by the Division of Radiological Protection, Bhabha Atomic Research Centre (BARC), Bombay. The system is presently in use for estimation of personnel doses of radiation workers of BARC, other units of the Department of Atomic Energy, and Defence medical units in India. The report gives salient features of the TLD personnel monitoring system. The report discusses design considerations of thermoluminescent dosimetry (TLD) badge for measurement of X and β;, γ personnel exposures, a filter combination to compensate for energy dependence of the TLD disc and angular dependence of the badge. The badge reader incorporates a semiautomatic mechanical arrangement wherein the TLD cards are read, raising the heater after positioning the TLD discs one by one. Various figures illustrate the mechanical layouts and electronics circuits used in the system. Periodic quality assurance check of the system which ensures a good reproducibility, is also described. (author)

  11. Status report of pelletron accelerator and ECR based heavy ion accelerator programme

    The BARC-TIFR Pelletron Accelerator is completing twenty seven years of round-the-clock operation, serving diverse users from institutions within and outside DAE. Over the years, various developmental activities and application oriented programs have been initiated at Pelletron Accelerator Facility, resulting into enhanced utilization of the accelerator. We have also been pursuing an ECR based heavy ion accelerator programme under XIIth Plan, consisting of an 18 GHz superconducting ECR (Electron Cyclotron Resonance) ion source and a room temperature RFQ (Radio Frequency Quadrupole) followed by low and high beta superconducting niobium resonator cavities. This talk will provide the current status of Pelletron Accelerator and the progress made towards the ECR based heavy ion accelerator program at BARC. (author)

  12. A deficit scaling algorithm for the minimum flow problem

    Laura Ciupală


    In this paper, we develop a new preflow algorithm for the minimum flow problem, called deficit scaling algorithm. This is a special implementation of the generic preflow algorithm for the minimum flow problem developed by Ciurea and Ciupală earlier. The bottleneck operation in the generic preflow algorithm is the number of noncancelling pulls. Using the scaling technique (i.e. selecting the active nodes with sufficiently large deficits), we reduce the number of noncancelling pulls to $O(n^2 \\log \\bar{c})$ and obtain an $O(nm+n^2 \\log \\bar{c})$ algorithm.

  13. An indigenous system for in-service inspection of coolant channels of 235 MWe PHWRs

    In-service inspection of coolant channels of nuclear power plants is essential to provide information on ageing effects. A channel inspection system (BARCIS- BARC Channel Inspection System) for in-service inspection of coolant channels of 235 MWe PHWRs has been recently developed at BARC. The need for such a system was being felt for quite sometime. The system is designed with the aim to minimise radiation exposure to inspection personnel and to perform the inspection so as to minimise reactor downtime. Sixteen coolant channels of RAPS-2 and fourteen coolant channels of MAPS-2 have been inspected using BARCIS MARK-1 system. Details of the system developed and the results of inspection are presented. (author). 3 refs., 3 tabs., 5 figs

  14. Traceable calibration of hospital 192Ir HDR sources

    A HDR 1000 PLUS well type ionization chamber, procured from Standard Imaging, USA, and maintained by medical Physics and Safety Section (MPSS), Bhabha Atomic Research Centre (BARC), India, as a reference well chamber 1 (RWCH1), was traceably calibrated against the primary standard established by Radiological Standards Laboratory (RSL), BARC for 192Ir HDR source, in terms of air kerma strength (AKS). An indigenously developed well-type ionization chamber, reference well chamber 2 (RWCH2) and electrometer system, fabricated by CD High Tech (CDHT) Instruments Private Ltd., Bangalore, India, was in turn calibrated against RWCH1. The CDHT system (i.e. RWCH2 and CDHT electrometer system) was taken to several hospitals, in different regions of the country, to check the calibration status of 192Ir HDR sources. The result of this calibration audit work is reported here. (author)

  15. A low noise hybrid preamplifier for nuclear spectroscopy applications

    Full text: A low noise hybrid preamplifier has been designed and developed successfully in collaboration with BEL, Bangalore. These hybrids are commercially available from BEL, Bangalore with part name as 'BMC 1521'. The hybrids provide flexibility of selecting input JFET, feedback resistor and feedback capacitor, thus making it useful for a wide range of applications in nuclear instrumentation. BMC 1521 based preamplifier has been evaluated using Silicon PIN diode detectors developed by BARC- BEL collaboration and an energy resolution of 2.75 KeV for 60 Ke V gamma rays has been obtained. It is also being used with proportional counter based nuclear spectroscopy applications in BARC. The present paper reports development of the low noise hybrid preamplifier and demonstrates its excellent performance with Si PIN diode detectors

  16. Development of neutron detectors and neutron radiography at Bhabha Atomic Research Centre

    A M Shaikh


    Design and development of neutron detectors and R&D work in neutron radiography (NR) for non-destructive evaluation are important parts of the neutron beam and allied research programme of Solid State Physics Division (SSPD) of Bhabha Atomic Research Centre (BARC). The detectors fabricated in the division not only meet the in-house requirement of neutron spectrometers but also the need of other divisions in BARC, Department of Atomic Energy units and some universities and research institutes in India and abroad for a variety of applications. The NR facility set up by SSPD at Apsara reactor has been used for a variety of applications in nuclear, aerospace, defense and metallurgical industries. The work done in the development of neutron detectors and neutron radiography is reported in this article.

  17. Silicon detector technology development in India for the participation in international experiments

    Anita Topkar; S Praveenkumar; Bharti Aggarwal; S K Kataria; M D Ghodgaonkar


    A specific research and development program has been carried out by BARC in India to develop the technology for large area silicon strip detectors for application in nuclear and high energy physics experiments. These strip detectors will be used as pre-shower detector in the CMS experiment at LHC, CERN for 0/ rejection. The fabrication technology to produce silicon strip detectors with very good uniformity over a large area of ∼ 40 cm2, low leakage currents of the order of 10 nA/cm2 per strip and high breakdown voltage of >500 V has been developed by BARC. The production of detectors is already under way to deliver 1000 detector modules for the CMS and 90% production is completed. In this paper, research and development work carried out to develop the detector fabrication technology is briefly described. The performance of the silicon strip detectors produced in India is presented. The present status of the detector technology is discussed.

  18. Water Chemistry Section: progress report (1981-82)

    The activities of the Water Chemistry Section of the Bhabha Atomic Research Centre (BARC), Bombay, during the years 1981 and 1982 are reported in the form of individual summaries. The research activities of the Section cover the following areas: (1) chemistry and thermodynamics of nuclear materials, (2) crystal structure of organo-metallic complexes using X-ray diffraction, (3) thermophysical and phase transition studies, (4) solid state chemistry and thermochemical studies, (5) water and steam chemistry of heavy water plants and phwr type reactors, and (6) uranium isotope exchange studies. A survey is also given of: (i) the Section's participation in advisory and consultancy services in nuclear and thermal power stations, (ii) training activities, and (iii) assistance in chemical analysis by various techniques to other units of BARC and outside agencies. A list of publications and lectures by the staff during the report period is included. (M.G.B.)

  19. Progress report of Technical Physics Division: April 1980 - March 1982

    Activities, with an individual summary of each, of the Technical Physics Division (TPD) of the Bhabha Atomic Research Centre (BARC), Bombay are reported for the period April 1980 - March 1982. The major thrust of the TPD's work has been in: (i) design and fabrication of instruments, devices and equipment and (ii) development of techniques in the frontline research and technology areas like vacuum science, surface analysis, cryogenics and crystal growing. The Division also provided custombuilt electronics equipment, vacuum systems and glass components and devices to the various Divisions of BARC and other units of the DAE. Training and manpower development activities and technology transfer activities are also reported. Lists of seminars, colloquia, publications during the period of the report are given. (M.G.B.)

  20. Thermoluminescence and its applications

    The proceedings contain the papers presented at the seminar. They give a broad outline of the current developments in India in the field of thermoluminescence (TL), also known as thermally stimulated luminescence (TSL). Although physical understanding of TL is still phenomenological, it is used on a large scale in the fields of radiation dosimetry and archaeometry. In India there are strong centres of research in TL phenomena at Indian Institute of Technology, Kharagpur; Maharaja Sayajirao University, Baroda; Bhabha Atomic Research Centre (BARC), Bombay; Physical Research Laboratory (PRL), Ahmedabad. A broad-based research programme for developing thermoluminescent dosimetry system is continuing at BARC and an up to date facility of dating of archaeological earthen objects has been established at PRL. The papers cover a broad spectrum of different aspects of TL and allied phenomena and are arranged in two parts entitled : (1) Thermoluminescence and Luminescence Phenomena, and (2) Electroluminescence (M.G.B.)

  1. Design and development of an integrated Environmental Radiation Monitor - Automatic Weather Station (ERM-AWS)

    Online monitoring of atmospheric gamma radiation and meteorological parameters is an important and useful input for handling any radiation emergency. Radiological Safety Systems Division, Bhabha Atomic Research Centre has been developing wide variety of radiation detectors, with continuous improvements based on the advancement in technology and user's requirements. BARC and ISRO (Indian Space Research Organization) under a collaborative program designed and integrated Environmental Radiation Monitor (ERM, developed under IERMON program by BARC) with Automatic Weather Station (AWS, developed by ISRO), as a single stand-alone ERM-AWS system. The system operates with solar powered battery backup and the data transmission is via satellite. ERM-AWS units have been produced and installed at few DAE and non-DAE facilities. A dedicated stand-alone satellite Earth Station has also been established at CTCRS, Anushaktinagar, Mumbai, to receive the data transmitted from ERM-AWS system. (author)

  2. Bhabha Atomic Research Centre : annual report 1990

    Research and development (R and D) activities of the Bhabha Atomic Research Centre (BARC) carried out during 1990 are reported. The main thrust of the R and D activities of BARC is on : (1)providing support to the nuclear power programme, (2)designing, building and utilising research reactors, (3)working in related frontline technologies, and also (4)basic research in frontier areas of science. These activities are described in brief under the chapters entitled : (1)Physical Sciences (2)Chemical Sciences (3)Materials and Material Science (4)Radioisotopes (5)Reactions (6)Fuel Cycle (7)Radiological Safety and Protection (8)Electronics and Instrumentation (9)Engineering Services (10)Life Sciences and (11)General. At the end of each chapter a list of papers and reports published in the subject field indicated by the title of the chapter is given. (N.B.). figs., tabs

  3. Application of Handheld Tele-ECG for Health Care Delivery in Rural India

    Meenu Singh; Amit Agarwal; Vineet Sinha; Rohit Manoj Kumar; Nishant Jaiswal; Ishita Jindal; Pankaj Pant; Munish Kumar


    Telemonitoring is a medical practice that involves remotely monitoring patients who are not at the same location as the health care provider. The purpose of our study was to use handheld tele-electrocardiogram (ECG) developed by Bhabha Atomic Research Center (BARC) to identify heart conditions in the rural underserved population where the doctor-patient ratio is low and access to health care is difficult. The objective of our study was clinical validation of handheld tele-ECG as a screening t...

  4. Development of Electron Guns for Linacs and DC Accelerator

    Electrons guns for RF linacs and DC Accelerators are designed and developed at Electron Beam Centre (EBC)/APPD/BARC. Planar geometry grid and Pierce geometry grid configuration diode and triode guns with LaB6 cathode are developed. The cathode assembly consists of cups and heat shields made out of Tantalum and Rhenium sheets. The cathode assembly and the electron guns are tested on a test bench for beam characterization. The paper presents the development of the electron guns.

  5. Introduction of the Indian Society for Mass Spectrometry

    Aggarwal, Suresh K.


    The Indian Society for Mass Spectrometry (ISMAS) was founded on March 21, 1978 at a meeting of the mass spectrometrists from all over India at Bhabha Atomic Research Centre (BARC), Bombay during the First National Seminar on Mass Spectrometry. The Society was formed with the objectives of promoting and popularizing massspectrometry and its applications in Research, Industry and other areas of Science. After 34 years, ISMAS now has more than 720 Life-Members and a few Corporate Members. The IS...

  6. Research and development activities of High Pressure Physics Division (October 1993 - March 1996)

    The research and development activities of the High Pressure Physics Division during the period October 1993-March 1996 are reported in the form of collection of papers presented in journals, conference proceedings and abstracts in conferences and Bhabha Atomic Research Centre (BARC) technical reports. The report is organised in two sections: (A) High Pressure Physics Division, and (B) Seismology Section. A list of staff members is enclosed at the end

  7. Scientometric dimensions of technical reports from Bhabha Atomic Research Centre

    Swarna, T.; Kalyane, V. L.; Vijai Kumar, *


    Technical report is one of the media to record the scientific information generated by scientists and engineers, Bhabha Atomic Research Centre (BARC) published 554 technical reports during 1990-99 under the categories: External (373) and Internal (181), Engineering and technology generated 207 technical reports followed by chemistry, materials and earth sciences (129), while their interdisciplinary interactions resulted in 31 technical reports, Life and environmental sciences produced 42 tech...

  8. Scientometric Dimensions of Innovation Communication Productivity of the Chemistry Division at Bhabha Atomic Research Centre

    Kademani, B. S.; Surwase, Ganesh; Anil Sagar, *; Lalit Mohan; Gaderao, C. R.; Anil Kumar; Kalyane, V. L.; Prakasan, E.R.; Vijai Kumar, *


    Scientrometric analysis of 1733 papers published by the teams comprising total of 926 participating scientists at Chemistry Division of Bhabha Atomic Research Centre (BARC) during 1970-1999 in the domains: Radiation & Photochemistry and Chemical Dynamics (649), Solid State Studies (558), Inorganic, Structural and Materials Chemistry (460) and Theoretical Chemistry (66) were analysed for yearwise productivity, authorship pattern and collaboration. The highest number of publicationsin a year we...

  9. Towards establishing nuclear data online services

    Efforts were successfully made to access online the internationally available nuclear data bases through INTERNET. Using Kermit, the work site at the BARC was connected to the Sunsparc workstation at the Pellatron laboratory. From the Sunsparc Workstation, invoking internet access, the online retrieval of the entire ENDF/B-VI library (ENDF/B-VI tapes 100 to 129 including all updates as on the date of retrieval) from the IAEA Nuclear Data Section, Vienna was successfully completed

  10. Food irradiation process control and acceptance. Regional UNDP project for Asia and the Pacific, mission undertaken in India. Food irradiation pilot scale studies and market testing RPFI-Phase 3

    A brief three-day visit to the Bhabha Atomic Research Center, Bombay, was made en-route to Thailand in mid-May. In addition to visits with professional staff of various BARC units plus the Isomed gamma radiation processing plant, a meeting was held with, and a seminar provided to representatives of interested private sector firms at State Trading Corporation Headquarters, and a videotape interview on food irradiation was made for inclusion in an educational videotape on the subject. (author)

  11. PSHED: a simplified approach to developing parallel programs

    This paper presents a simplified approach in the forms of a tree structured computational model for parallel application programs. An attempt is made to provide a standard user interface to execute programs on BARC Parallel Processing System (BPPS), a scalable distributed memory multiprocessor. The interface package called PSHED provides a basic framework for representing and executing parallel programs on different parallel architectures. The PSHED package incorporates concepts from a broad range of previous research in programming environments and parallel computations. (author). 6 refs

  12. Dosimetry and treatment planning of Occu-Prosta I-125 seeds for intraocular lesions

    Chaudhari Suresh; Deshpande Sudesh; Anand Vivek; Sandeep; Saxena Sanjay; Dash A; Basu Mahua; Samant Preetam; Kannan V


    Intraocular malignant lesions are frequently encountered in clinical practice. Plaque brachytherapy represents an effective means of treatment for intraocular lesions. Recently Radiopharmaceutical Division, BARC, Mumbai, has indigenously fabricated reasonable-cost I-125 sources. Here we are presenting the preliminary experience of dosimetry of sources, configuration of treatment planning system (TPS) and quality assurance (QA) for eye plaque therapy with Occu-Prosta I-125 seeds, treated in ou...

  13. National facility for neutron beam research in India

    A national facility for neutron beam research is operated at the research reactor Dhruva in BARC. It includes single-crystal and powder diffractometers, a polarization analysis spectrometer, inelastic and quasi-elastic scattering spectrometers in the reactor hall, and smallangle scattering instruments and a polarized neutron reflectometer in the neutron-guide laboratory. The National facility is utilized in collaboration with various universities and other institutions. The talk will present our facilities and discuss examples of recent work.

  14. Physics study of D-D/D-T neutron driven experimental subcritical assembly

    An experimental program to design and study external source driven subcritical assembly has been initiated at BARC. This program is aimed at understanding neutronic characteristics of accelerator driven system at low power level. In this series, a zero-power, sub-critical assembly driven by a D-D/D-T neutron generator has been developed. This system is modular in design and it is first in the series of subcritical assemblies being designed

  15. Indian Experience In Commissioning, Operation and Safety of Wet Type Spent Fuel Storage Facilities

    The Indian Nuclear Power Programme is heavily based on PHWR. The spent fuels generated in Indian PHWRs are stored in water pools At Reactor and Fuel storage Facilities for interim periods before reprocessing. The technology of design, construction, commissioning and operation of these fuel storage facilities has been mastered by BARC. Some of the innovative features and operating experience of these facilities are described in this paper. (author)

  16. Transient behaviour and coupling aspects of a hybrid MSF-RO nuclear desalination plant

    BARC is setting up a 6300 M3/day (1.4 MGD) hybrid MSF-RO nuclear desalination plant for sea water desalination at Madras Atomic Power Station (MAPS) coupled to a 170 MWe Pressurised Heavy Water Reactor (PHWR). The transient behaviour and coupling aspects of this dual purpose plant has been discussed. A hybrid desalination plant appears to offer high availability factor. (author)

  17. Policies and public opinion towards immigrants: the Spanish case

    Zapata, Ricard


    Abstract By tackling negative opinions towards immigration we can create a basis to orientate policies that seek to reduce them. My purpose is to highlight that the analysis of immigration in Spain exemplifies a clear link between policies and public opinion. It is this link that is at the basis of what I will call the ambivalence of Spanish public opinion, when border and integration issues are compared. (Zapata, Ricard) Universitat Pompeu Fabra - Barc...

  18. Routine clinical utility of aerosol lung scan (ALS) in patients being evaluated for pulmonary embolism (PE)

    99mTc-DTPA/MDA aerosol lung scan (ALS) (using BARC apparatus), 99mTc-MAA lung perfusion scan and chest radiography are routinely performed during the same visit in patients referred with the clinical suspicion of pulmonary embolism (PE). It is concluded that ALS is an excellent for diagnostic interpretation of PE as compared with chest radiography in significant number of patients

  19. High peak power Nd:glass lasers for fusion research

    This paper briefly reviews the basics of fusion and some of the major problems associated with building a 4 arms 1 kJ, 1 ns Nd:glass laser chain currently under development at the Bhabha Atomic Research Centre(BARC), Bombay. With this laser, it is proposed to study the various laser plasma interaction processes and to obtain compression of glass micro balloon targets filled with DT gas. (author). 15 refs., 8 figs., 3 tabs

  20. Development of NTD Ge Sensors for Superconducting Bolometer

    Garai, A.; Mathimalar, S.; Singh, V.; Dokania, N.; Nanal, V.; Pillay, R. G.; Ramakrishnan, S.; Shrivastava, A.; Jagadeesan, K. C.; Thakare, S. V.


    Neutron transmutation-doped (NTD) Ge sensors have been prepared by irradiating device-grade Ge with thermal neutrons at Dhruva reactor, BARC, Mumbai. These sensors are intended to be used for the study of neutrinoless double beta decay in ^{124}Sn with a superconducting Tin bolometer. Resistance measurements are performed on NTD Ge sensors in the temperature range 100-350 mK. The observed temperature dependence is found to be consistent with the variable-range hopping mechanism.

  1. Beryllium facilities in India

    Due to its unique combination of physical, mechanical, thermal and nuclear properties, beryllium is indispensable for many applications in the fields of nuclear and space sciences. Beryllia and copper beryllium alloys have also found extensive applications in the electrical and electronic industries. Beryllium facilities at Bhabha Atomic Research Centre (BARC) have been set up to meet indigenous requirements for these materials. Besides developing beryllium technology, the project team has also designed and developed a number of special purpose equipment. (Author)

  2. Dicty_cDB: SFL411 [Dicty_cDB

    Full Text Available SF (Link to library) SFL411 (Link to dictyBase) - - - Contig-U16162-1 SFL411F (Link to Original ... ne RP71-37O2. 40 7e-04 3 CC453706 |CC453706.1 BARC-Sat _155 Size-selected soybean genomic Glycine max geno ... . 39 0.080 AP008215_246( AP008215 |pid:none) Oryza sat iva (japonica cultivar-... 39 0.080 AP002047_15( AP ...

  3. Feasibility of Natore Rubber Dam on Mahanonda River in Bangladesh and its Performance on Irrigation

    Md. Sazadul Hasan; Md. Imran Kabir


    Low rainfall in winter causes a great problem on irrigation. Bangladesh Agricultural Research Council (BARC) started research on this problem from 1974. In 1994-95, Rubber Dam projects have been taken by BIC (Beijing IWHR Corporation) in Bangladesh as it is very convenience and effective in both irrigation and cultivation of crops in winter. After installing, it is very important and challenging task to study the suitability and effect of Rubber Dam on agriculture. In this research work, t...

  4. Study of major factors to affect photoresist profile on developable bottom anti-reflective coating process

    Roh, Hyo Jung; Ju, Dong Kyu; Kim, Hyun Jin; Kim, Jaehyun


    As critical dimensions continue to shrink in lithography, new materials will be needed to meet the new demands imposed by this shrinkage. Recently, there are needs for novel materials with various substrates and immersing process, including double patterning process, a high resolution implant process, and so on. Among such materials, Developable Bottom Anti-reflective Coating material (DBARC) is a good candidate for high resolution implant application as well as double patterning. DBARC should have reflectivity control function as an ordinary BARC, as well as an appropriate solubility in TMAH-based conventional developer after exposure and bake process. The most distinguished advantage of DBARC is to skip BARC etch process that is required in normal BARC process. In spite of this advantage, the photoresist profile on DBARC could be influenced by components and process conditions of DBARC. Several groups have tried to solve this issue to implement DBARC to new process. We have studied material-related factors affecting photoresist profiles, such as a polymer, photo-acid generators (PAGs), and additives. And we explored the effect of process condition for photoresist and DBARC. In case of polymer, we studied the effect of dissolution rate in developer and crosslinking functionality. For PAGs and additives, the effect of acid diffusivity and cross-linking degree according to their bulkiness were examined. We also evaluated coated film stability in a photoresist solvent after BARC bake process and compared lithographic performance of various DBARC formulations. In addition, the effect of photoresist profile with bake condition of photoresist and DBARC were investigated. In this paper, we will demonstrate the most influential factors of DBARC to photoresist profile and suggest the optimum formulation and process condition for DBARC application.

  5. Report on R and D activities of Health Physics Division: 1988-1989

    The report summarises the different aspects of R and D programmes carried out in the Health Physics Division, BARC during 1988 and 1989. The results of various types of investigations on radiation physics, radiation dosimetry, instrumentation and techniques, environmental studies, micrometeorology etc. are presented in the form of abstracts. References to the detailed studies covered in the abstracts are also given in the appropriate sections. (author)

  6. Lipids differentially degraded during tissue freezing and thawing


    @@ Plants cope with freezing and thawing by altering the lipid composition of their cell membranes. Such cellular responses go through three phases Successful test flight of an airship Researchers with the Balloon Aircraft Research Center (BARC) of the Academy of Opto-electronics, CAS, succeeded in their first test flight of an aeroboat with a flight altitude up to 1,000 meters and an effective payload of 20 kilograms in Shandong on 25 December, 2007.

  7. Operating experience and modifications in process instrumentation after commissioning of Dhruva

    Dhruva located in BARC at Trombay, Mumbai is a research reactor, utilized for scientific experiments and production of isotopes for medical, agricultural and industrial applications. Instrumentation has been provided for safe and trouble free operation of the reactor through continuous monitoring and control of vital process parameters such as pressure, flow, level and temperature. The papers covers operating experience of these systems, problems faced and modifications carried out for overcoming those problems. (author)

  8. Enhanced power generation in concentrated photovoltaics using broadband antireflective coverglasses with moth eye structures.

    Song, Young Min; Jeong, Yonkil; Yeo, Chan Il; Lee, Yong Tak


    We present the effect of broadband antireflective coverglasses (BARCs) with moth eye structures on the power generation capability of a sub-receiver module for concentrated photovoltaics. The period and height of the moth eye structures were designed by a rigorous coupled-wave analysis method in order to cover the full solar spectral ranges without transmission band shrinkage. The BARCs with moth eye structures were prepared by the dry etching of silver (Ag) nanomasks, and the fabricated moth eye structures on coverglass showed strongly enhanced transmittance compared to the bare glass with a flat surface, at wavelengths of 300 - 1800 nm. The BARCs were mounted on InGaP/GaAs/Ge triple-junction solar cells and the power conversion efficiency of this sub-receiver module reached 42.16% for 196 suns, which is a 7.41% boosted value compared to that of a module with bare coverglass, without any detrimental changes of the open circuit voltages (V(oc)) and fill factor (FF). PMID:23326839

  9. Development of an analytical model for predicting the performance behaviour of passive box type catalytic recombiner for H2 mitigation

    Full text: Among the several methodologies for mitigating the consequences of release of H2 in the containments of NPPs, the one based on passive catalytic recombination with O2 in air is being considered for its application world over. Series of experimental studies for the development of hydrogen mitigation system based on passive box-type catalytic recombiner were conducted in HYMIS test facility at BARC. As a part of back-up to these studies, a computer code BOXCAT for predicting the performance of the convective box type recombiner has been successfully developed at BARC. Some of the salient features of the developed code are : (a) representation of catalytic oxidation reaction by the Arrhenius rate equation. (b) the heat dissipation to the surrounding gas by natural/forced convection and that to the structure by radiation, (c) momentum equation to calculate the buoyancy driven gas flow through the box assuming the entire box as a one-dimensional junction across which the gas mixture accelerates due to net forces acting across the junction and (d) a suitable model to calculate the lumped loss coefficient of the box. The code has been successfully validated against the performance behaviour data of Siemens recombiner for dry conditions as well as against the in-house data generated in HYMIS test facility at BARC. The code is presently capable of handling only dry H2 air mixture (without steam). The validated code has been subsequently used to optimize the design of the new prototype recombiner

  10. Advancements in organic antireflective coatings for dual-damascene processes

    Deshpande, Shreeram V.; Shao, Xie; Lamb, James E., III; Brakensiek, Nickolas L.; Johnson, Joe; Wu, Xiaoming; Xu, Gu; Simmons, William J.


    Dual Damascene (DD) process has been implemented in manufacturing semiconductor devices with smaller feature sizes (EQ 0.20 micrometer), due to increased use of copper as a metal of choice for interconnects. Copper is preferred over aluminum due to its lower resistance which helps to minimize the effects of interconnect delays. Via first DD process is the most commonly used process for manufacturing semiconductor devices since it requires less number of processing steps and also it can make use of a via fill material to minimize the resist thickness variations in the trench patterning photolithography step. Absence of via fill material results in non-uniform fill of vias (in isolated and dense via regions) thus leading to non-uniform focus and dose for exposure of the resist in the deep vias. This results in poor resolution and poor critical dimension (CD) control in the trench-patterning step. When a via fill organic material such as a bottom anti- reflective coating (BARC) is used, then the resist thickness variations are minimized thus enhancing the resolution and CD control in trench patterning. Via fill organic BARC materials can also act as etch blocks at the base of the via to protect the substrate from over etch. In this paper we review the important role of via fill organic BARCs in improving the efficiency of via first DD process now being implemented in semiconductor manufacturing.

  11. Environmental gamma radiation levels around various DAE research centres

    This paper presents the gamma radiation levels of four research centres viz. Bhabha Atomic Research Centre (BARC), Trombay; Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam; Variable Energy Cyclotron Centre (VECC), Kolkata; Raja Ramanna Centre for Advanced Technology (RRCAT), Indore; and an industry Board of Radiation and Isotope Technology (BRIT), Vashi. BARC is India's premier nuclear research facility and is a multi-disciplinary research centre with extensive infrastructure for advanced research and development (R and D). IGCAR, Kalpakkam is engaged in scientific research and advanced engineering programme towards the development of Fast Breeder Reactor technology. VECC Kolkata is dedicated to carry out frontier R and D in the fields of Accelerator Science and Technology, Nuclear Science (Theoretical and Experimental), and Material Science etc. RRCAT, Indore has rapidly grown into a premier institute for R and D in lasers, accelerators and their applications. BRIT, Vashi unit is involved in production, development, and supply of radioisotope based products and provision of isotope applications, radiation processing, radio analytical services etc. With an objective to keep a watch on the prevailing environmental background gamma radiation level around all the DAE installations, routine monitoring programme are being carried out using the Thermo Luminescent Dosimeters (TLDs). TLDs provide the simple, inexpensive and precise measurement of small, integrated, external gamma radiation dose rate. The general practice of this programme is to observe the outdoor gamma radiation levels. This paper summarizes the methodology and gamma radiation levels of four research centres viz. BARC, IGCAR, VECC, RRCAT and an industry BRIT, Vashi

  12. Feasibility study of 'in-house' resin for different nuclear waste effluent treatment - targeting 'zero uranium discharge'

    Solid phase extraction processes involving a specially designed three dimensionally cross linked hydrophilic chelating polymeric resin, has been designed and developed in Desalination Division. The specific complexation between the extractant and metal ion (particularly uranium) provides good selectivity, extractability and indicates the possibility of selective removal/recovery of the valuable metal ions. As a specialty, resin can be regenerated and reused. In this regard, composite sorbent has been synthesized by polymerization of acrylamide with multivalent amide acrylate agent, followed by conversion by chemical reaction. The 'IN-HOUSE' chelate resin developed targeting recovery of uranium from low concentration aqueous solution such as sea water, mining/flooding/nuclear plant washed effluent and even effluents generated in nuclear plant, front-end as well as back-end. To study the performance and feasibility of the sorbent, experiments have been carried out with the following relevant effluents of nuclear industry: 1) The treated raffinate of UED, BARC plant effluent having uranium concentration of 30 ppm-5 ppm. 2) Tailing Pond Leachate and inlet of Effluent Treatment Plant of UCIL, Jadugudah, (carried out along with Environmental Assessment Division (EAD, BARC)) starting from 2 ppm to 60 ppb feed solution. 3) The recovery of valuables from seawater effluents of desalination plant (Desalination Division (DD), BARC) which contain about 3 ppb level of uranium from 5% total dissolved salts. (author)

  13. Photoproduction of hidden-charm states in $\\gamma p \\to \\bar{D}^{*0} \\Lambda^+_c$ reaction near threshold

    Huang, Yin; He, Jun; Chen, Xurong; Zhang, Hong-Fei


    We report on a theoretical study of the hidden charm $N^*_{c \\bar{c}}$ states in the $\\gamma p \\to \\bar{D}^{*0} \\Lambda^+_c$ reaction near threshold within an effective Lagrangian approach. In addition to the contributions from the $s$-channel nucleon pole, the $t$-channel $D^0$ exchange, the $u$-channel $\\Lambda^+_c$ exchange and the contact term, we study the contributions from the $N^*_{c \\bar{c}}$ states with spin-parity $J^P = 1/2^-$ and $3/2^-$. The total and differential cross sections of the $\\gamma p \\to \\bar{D}^{*0} \\Lambda^+_c$ reaction are predicted. It is found that the contributions of these $N^*_{c \\bar{c}}$ states give clear peak structures in the total cross sections. Thus, this reaction is another new platform to study the hidden-charm states. It is expected that our model calculation may be tested by the future experiments.

  14. Software feature enhancements for automated scanning of multiple surface geometry objects using ultrasonic imaging system

    Electronics Division, BARC in association with Metallic Fuels Division has developed an Ultrasonic Imaging System suitable for automated inspection of metallic objects with multiple surface geometry. The electronics hardware and application software for this system has been developed by Electronics Division and the design and development of the mechanical scanner was done by Metallic Fuels Division, BARC. The scanner has been successfully interfaced with the high-resolution ultrasonic imaging system (ULTIMA-200SP). A very significant feature of the ULTIMA-200SP system is the application software which performs various tasks of controlling various motors of scanner in addition to data acquisition, processing, analysis and information display. All these tasks must be carried out in a well synchronized manner for generating high resolution B Scan and C Scan images of test objects. In order to meet stringent requirements of the user, ULTIMA software has been extensively upgraded with new advanced features viz. Fast (coarse) and Slow (fine) scan for the speed optimization, Scanning of Cuboids and Cylindrical objects in the user defined region of interest, 3D view of the C-Scan, gray level, dual or multiple color plot in B-Scan, C-Scan and 3D views. This paper describes the advanced Windows based application software package developed at ED, BARC and highlights its salient features along with a brief description of the system hardware and relevant information. (author)

  15. Permeation of gases through electron-beam-irradiated polymer films

    The permeation of CO2, CH4, O2, N2, SF6, and He was measured at 35deg C in electron-beam-irradiated polymer films such as 1,2-polybutadiene (PB), polycarbonate (PC), polydimethylsiloxane (PDMS), poly(ethylene terephthalate) (PET), poly(4-methylpentene-1) (PMP), and polypropylene (PP). The permeability coefficients of the gases in PB decreased and those in PP increased with increasing irradiation dose, while those of PC, PDMS, PET, and PMP were virtually unaffected by irradiation. These results were attributed to the radiation effects of crosslinking in PB and degradation in PP. PC, PDM, PET, and PMP were insensitive to radiation, which accounts for the little change in permeation behavior. The decreases in permeability coefficients of the gases in irradiated PB films were attributed to changes in diffusivity, while solubility was not greatly affected. The dependence of permeability coefficients on crosslinking density of the irradiated PB films was also discussed. Decreases in permeability and diffusion coefficients were interpreted as due to decrease of free-volume content by crosslinking. The diffusion coefficient showed an approximately exponential relationship to the reciprocal of the average molecular weight between crosslinks (M-barc) over a range of M-barc between 200 and 20000. This suggests that the free-volume of the crosslinked polymer may be proportional to M-barc. (author)

  16. Bhabha Atomic Research Centre: annual report 1986-87

    The Research and Development (R and D) work and achievements of the Bhabha Atomic Research Centre, Bombay, during the financial year 1986-1987 are reported. The R and D activities of BARC cover the entire nuclear fuel cycle, production and use of radioisotopes, radiation protection and also basic research in several disciplines. The report is presented in the chapters entitled: Physical Sciences, Chemical Sciences, Materials and Materials Science, Life Sciences, Radioisotopes, Reactors, Fuel Cycle, Health and Safety, Electronics and Instrumentation, Engineering and General Services. At the end of each chapter are listed the journal articles published, the paper presented at conferences, symposia etc. and technical reports issued by the scientists of BARC in the subject field indicated by the title of the chapter. The R and D work of the outstation units of BARC, namely, Nuclear Research Laboratory at Srinagar, High Altitute Research Laboratory at Gulmarg, Variable Energy Cyclotron Centre at Calcutta and Gauribidanur Seismic Array near Bangalore are also described in the report. The report concludes with a brief account of: (1) transfer of technologies developed at the Centre, (2) activities related to human resource development for nuclear programmes of the country, and (3) progress of design and construction work of Centre for Advanced Technology at Indore. (M.G.B.)

  17. Bhabha Atomic Research Centre annual report : 1989

    The main thrust of the various research and development (R and D) activities of the Bhabha Atomic Research Centre (BARC), Bombay, is towards the implementation of India's nuclear power programme. To that end, its R and D activities cover the entire nuclear fuel cycle, reactor technology; applications of radioisotopes and radiations in agriculture, medicine and industries; and radiation protection in nuclear installations. The report presents in summarised form the R and D activities carried out during 1989 in the chapters entitled: Physical Sciences, Chemical Sciences, Materials and Materials Sciences, Radioisotopes, Reactors, Fuel Cycle, Radiological Safety and Protection, Electronics and Instrumentation, Engineering Services, Life Sciences and General. At the end of each chapter, a list of publications by the staff scientists in the corresponding subject field is given. The list includes published journal articles and technical reports, and papers presented at conferences, symposia etc. The report also covers the R and D activities of the outstation units of BARC, namely, Nuclear Research Laboratory, Srinagar; High Altitude Research Laboratory, Gulmarg; and Variable Energy Cyclotron Centre, Calcutta. BARC is also engaged in basic an applied research in frontier areas of science such as plasma and fusion physics, accelerators and lasers, high temperature superconductivity, condensed matter physics, high pressure physics, high resolution spectroscopy, chemical reaction dynamics and laser induced chemistry, electronics and robotics: radiation biology, and genetic engineering. Report is illustrated with a number of figures, graphs, and coloured pictures. (M.G.B.) figs., refs

  18. Progress report: 1996 Radiation Safety Systems Division

    The activities of Radiation Safety Systems Division include (i) development of specialised monitoring systems and radiation safety information network, (ii) radiation hazards control at the nuclear fuel cycle facilities, the radioisotope programmes at Bhabha Atomic Research Centre (BARC) and for the accelerators programme at BARC and Centre for Advanced Technology (CAT), Indore. The systems on which development and upgradation work was carried out during the year included aerial gamma spectrometer, automated environment monitor using railway network, radioisotope package monitor and air monitors for tritium and alpha active aerosols. Other R and D efforts at the division included assessment of risk for radiation exposures and evaluation of ICRP 60 recommendations in the Indian context, shielding evaluation and dosimetry for the new upcoming accelerator facilities and solid state nuclear track detector techniques for neutron measurements. The expertise of the divisional members was provided for 36 safety committees of BARC and Atomic Energy Regulatory Board (AERB). Twenty three publications were brought out during the year 1996. (author)

  19. Status of $\\psi$ (3686), $\\psi$ (4040), $\\psi$ (4160), Y (4260), $\\psi $ (4415) and X (4630) charmonia like states

    Shah, Manan; Parmar, Arpit; Vinodkumar, P C


    We examine the status of charmonia like states by looking into the behaviour of the energy level differences and regularity in the behaviour of the leptonic decay widths of the excited charmonia states. The spectroscopic states are studied using a phenomenological Martin-like confinement potential and their radial wave functions are employed to compute the di-leptonic decay widths. Their deviations from the expected behaviour provide a clue to consider them as admixtures of the nearby S and D states. The present analysis strongly favour \\$$\\backslash$psi \\$ (3686) as admixture of $c \\bar{c}$ (2S) and $c \\bar{c}$g (4.1 GeV) hybrid, \\$$\\backslash$psi \\$ (4040) and \\$$\\backslash$psi \\$ (4160) as admixture states of charmonia (3S, 3D) states with mixing angle \\$$\\backslash$theta \\$ = 11$^\\circ$ and 45$^\\circ$ respectively. We identify Y (4260) as a pure $c \\bar{c}$ (4S) state whose leptonic decay is predicted as 0.65 keV. While X(4630) is closer to the $c \\bar{c}$ (6S) state. The status of \\$$\\backslash$psi \\$ (4...

  20. Nuclear research centres - Their evolution in the Indian context

    In a developing country, the role of the nuclear research centres (NRC) is quite large as it involves research, development, demonstration and deployment. The Bhabha Atomic Research Centre (BARC), the mother institution for all nuclear activities in India, has played this role for more than 40 years. With the successful deployment, the subsequent growth and management, both in the power and non-power sectors, is carried out by public sector enterprises. BARC continues to provide R and D support for improving performance and safety, technologies for repair and refurbishment, plant life management and evolutionary changes in the plant design. It has the responsibility of managing the backend of the fuel cycle. BARC has also been the nucleus for new research centres devoted to the development of fast reactors, accelerators and lasers. National NRCs, which provide exciting R and D opportunities with future orientation, provide assurance of availability of requisite skills and expertise while at the same time working for the futuristic objectives of the country. (author)

  1. Inelastic J/psi electroproduction in e-p collisions

    Balbi, P


    Following HERA experiments our interest is focused, in the present paper, on charmonium production in lepton-proton collisions. Inelastic J/\\psi electroproduction is quite difficult to be measured due to the low rates of events; almost all experimental studies are indeed performed in photoproduction regime. J/\\psi resonance is considered as the product of the hadronization of a c \\bar{c} pair generated via boson-gluon fusion. The leading order contribution to the differential cross section, with respect to virtual photon-proton center of mass energy W and transferred four-momentum squared Q^2, is written as the sum of two terms related to a colour singlet and a colour octet c \\bar{c} pair production respectively. This expression contains two-gluons contributions and depends on three parameters; two of them are related to the hadronization fractions in charmonium states for the c \\bar{c} pair (colour singlet and colour octet), while the third parameter takes into accout possible ``hot-spot'' effects. The value...

  2. X-ray imaging for non-destructive testing of internal disorders in fruits

    A physiological disorder known as spongy tissue involving damage of the mesocarp (flesh) affects 20 to 30 percent of mango fruits, particularly Alphonso, the leading commercial variety of India. Large sized fruits and those more advanced in maturity or harvested when ripe show increased incidence of spongy tissue. The mango processing industry is also facing quality control problems and economic loss as weevil-infested fruits can contaminate the processed pulp as well as the processing machinery with insect, fecal and feed remnants. Studies undertaken in the Food Technology Division, Bhabha Atomic Research Centre (BARC), Mumbai with assistance from Radiation Standards Section, Radiological Unit, BARC Hospital and ECIL, Hyderabad, have shown that both spongy tissue affected and seed weevil infested mango fruits can be detected by x-ray transmittance. The resulting image can be used to detect affected fruits. An automated system for detecting and rejecting mangoes with spongy tissue or seed weevil infestation is under development in collaboration with the Electronic Systems Division, BARC. (author)

  3. Human resource development strategies adopted by the Department of Atomic Energy, India

    In view of the knowledge intensive nature of the nuclear technology and the state of hi-tech industrial infrastructure in India, Bhabha Atomic Research Centre (BARC) has been designed to have a composite character. It is a large institution and has been pursuing activities starting from basic research to technology development. At BARC, we have also put in place a very effective human resource development programme and this programme is run by faculty drawn from within the organization. As a result, BARC has attributes of an institute, a research laboratory and also an industrial organization. The composite character is confined not only to BARC but also extends to the Department of Atomic Energy (DAE) as a whole. Simultaneous with research centres, we have been setting up industrial units. The fountainhead of success of the atomic energy programme in India is the fact that both the research centres, which generate knowledge and the industrial units, which generate wealth from the knowledge, are under one umbrella and that is the DAE working under the policy framework laid by the Atomic Energy Commission. The two sets of institutions maintain an organic linkage permitting seamless interaction and facilitating technology transfer without any cumbersome formalities. The common policy framework followed by all the institutions enables the department to follow an integrated approach towards human resource development and this further strengthens the linkages between the institutions. This has enabled the country to be self-reliant in all aspects of nuclear fuel cycle, starting with prospecting and mining of uranium and ending with the back-end of the fuel cycle, which involves reprocessing of the spent fuel and nuclear waste management. Most of the R and D work, which led to realization of this capability, was done or initiated at BARC at Trombay. Some of the activities have now been taken over by other research centers: IGCAR at Kalpakkam for fast reactors, Centre for

  4. Indian experience in neutron beam utilization: Inhouse and collaborative programs

    Neutron beam research, initiated in India during the late fifties, has evolved into the present National Facility for Neutron Beam Research (NFNBR), operated at Bhabha Atomic Research Centre (BARC), Mumbai, by scientists of Solid State Physics Division (SSPD). Dhruva, a 100 MW, natural uranium fuelled, heavy water moderated, and heavy water cooled research reactor, is the main source of neutrons, with a flux of about 1.8x1014 neutrons/cm2/s, for NFNBR. A four-circle single-crystal diffractometer, two powder diffractometers, a high-Q diffractometer, a polarization analysis spectrometer, a triple-axis spectrometer, a filter detector spectrometer, and a quasi-elastic scattering spectrometer are located inside Dhruva reactor hall, while two small-angle neutron scattering instruments are operational in the adjacent Guide-Tube Laboratory (GTL). A polarized neutron reflectometer has recently become operational, and a spin-echo spectrometer is under installation. Two neutron guide tubes, G1 and G2 (length: 21m and 35m, radius of curvature: 1916m and 3452m, characteristic wavelength: 3.0A and 2.2A respectively) transport neutron beams to GTL from the reactor hall. Average flux at the breaks, provided on the guides to accommodate various instruments, is about 107 neutrons/cm2/s. A neutron interferometer, originally installed at CIRUS reactor, is being upgraded, and plans to build a prompt gamma-ray neutron activation analysis facility, in collaboration with Radio Chemistry Division (RCD), are currently underway. Apsara reactor houses the neutron radiography and detector development facilities. Neutron detectors are developed and fabricated by NFNBR, for both in-house use, and supply to other users in the country. Linear position-sensitive detectors, using helium-3, have been developed and extensively used at BARC during the past decade. A two dimensional position-sensitive detector has also been fabricated and tested recently. All the neutron instruments, guide tubes

  5. Design, development and operational experience of radio frequency (RF) power systems/technologies for LEHIPA and 400 keV RFQ

    The important technology development for ion accelerators of 'accelerator driven sub critical reactor system (ADS) is being done under the program of Department of Atomic Energy (DAE). In BARC (BARC) of DAE, technology development of 400 keV radio frequency quadrupole (RFQ) accelerator is done and a 20 MeV - low energy high intensity proton accelerator (LEHIPA) is under development. A 400 KeV deuteron RFQ accelerator is already developed at BARC and its 60 kW radio frequency (RF) power system required for beam acceleration has been designed, developed and tested both in CW mode and in pulse mode for full power of 60 leW. It has been successfully integrated with RFQ via 6-1/8'', 50 ohm RF transmission line, to accelerate proton beam up to 200 KeV energy and deuteron beam to 400 KeV energy. LEHIPA requires about 3 MW of RF power for its operation. So, three 1 MW, 352 MHz RF systems based on klystron will be developed for RFQ and two DTLs. The klystron based RF system for 3 MeV RFQ is under commissioning. Its various subsystems like energy less and insulated gate bipolar transistor (IGBT) based high voltage and low voltage bias supplies, a critical and fast protection and control system - handling various types of field signals, fast acting hard wired instrumentation circuits for critical signals, 100 kV crowbar with its circuits, pulsing circuits and RF circuits have been successfully designed, developed and integrated with klystron. Latest technology development of solid state RF amplifiers at 325 MHz and 350 MHz for normal and super conducting accelerators has attained a certain power level. This paper will discuss all these high power RF systems in detail. (author)

  6. Medical physics aspects of ophthalmic brachytherapy

    Intraocular melanoma is the most common primary malignancy of the eye. Radiation therapy using ophthalmic plaque has proved successful in the management of various ocular lesions. Although a few centres were using 90Sr/90Y plaques for shallow turtlours some years ago, eye plaque therapy was not a common practice in India. A revived interest in the use of eye plaque therapy and very high cost of imported sources has led to the development and production of 125I seed sources by the Radiopharmaceuticals Division, BARC. This report presents a brief description on the clinical, dosimetry and radiation safety aspects of 90Sr/90Y and 106Ru/106Rh beta ray and 125I gamma ray eye plaque applicators. This report has been divided in five Sections. Section I presents general introduction of ophthalmic brachytherapy including the structure of a human eye, types of ophthalmic plaques and characteristics of radioisotopes commonly used in such applications. A brief review of sources, applicators and dosimetry of 90Sr/90Y and 106Ru/106Rh beta and 125I gamma ophthalmic plaques are given in Section II and Section III, respectively. Section IV contains the single seed dosimetry data of BARC OcuProsta 125I seed as well as dosimetry data of typical eye plaques loaded with BARC OcuProsta 125I seed. Quality assurance and radiation safety aspects of these eye applicators are described in Section V. A proforma of the application required to be filled in by the user institution for obtaining regulatory consent to start eye plaque therapy has also been appended to this report. (author)

  7. Split-Hopkinson Pressure Bar: an experimental technique for high strain rate tests

    Mechanical properties of materials are, in general, strain rate dependent, i.e. they respond differently at quasi-static and higher strain rate condition. The Split-Hopkinson Pressure Bar (SHPB), also referred to as Kolsky bar is a commonly used setup for high strain rate testing. SHPB is suitable for high strain rate test in strain rate range of 102 to 104 s-1. These high strain rate data are required for safety and structural integrity assessment of structures subjected to dynamic loading. As high strain rate data are not easily available in open literature need was felt for setting up such high strain rate testing machine. SHPB at BARC was designed and set-up inhouse jointly by Refuelling Technology Division and Mechanical Metallurgy Division, at Hall no. 3, BARC. A number of conceptual designs for SHPB were thought of and the optimized design was worked out. The challenges of precision tolerance, straightness in bars and design and proper functioning of pneumatic gun were met. This setup has been used extensively to study the high strain rate material behavior. This report introduces the SHPB in general and the setup at BARC in particular. The history of development of SHPB, the basic formulations of one dimensional wave propagation, the relations between the wave velocity, particle velocity and elastic strain in a one dimensional bar, and the equations used to obtain the final stress vs. strain curves are described. The calibration of the present setup, the pre-test calculations and the posttest analysis of data are described. Finally some of the experimental results on different materials such as Cu, SS305, SA516 and Zr, at room temperature and elevated temperatures are presented. (author)

  8. Bhabha Atomic Research Centre: annual report 1988

    The research and development (R and D) work carried out in the Bhabha Atomic Research Centre (BARC), Bombay during 1988 is summarised and presented in the sections entitled Physical Sciences, Chemical Sciences, Materials and Materials Science, Radioisotopes, Reactors, Fuel cycle, Radiological Safety and Protection, Electronics and Instrumentation, Engineering Services, Life Sciences and General. At the end of each section a list of publications is also given. The R and D work of the outstation units of BARC, namely, Nuclear Research Laboratory, Srinagar; High Altitute Research Laboratory, Gulmarg and Variable Energy Cyclotron Centre, Calcutta are also described in this report. Some of the highlights of the work during the year are: (1) Medium Energy Heavy Ion Accelerator (MEHIA) facility set up jointly by BARC and the Tata Institute of Fundamental Research (TIFR) at TIFR premises became fully operational in September 1988. A number of new compositions of high temperature supconducting materials were synthesized. The highest transition temperature achieved was 125 K. Research work to improve the quality of sintered uranium oxide pellets achieved the purpose. Nuclear fuels were fabricated by using sol-gel process. R and D work for 235 MWe and 500 MWe PHWR type reactors is continuing. Conceptual design of the fuel handling system for the prototype fast breeder reactor was finalised. 233U+Al alloy fuel for Kamini reactor was fabricated. Progress has been made in industrial applications of enzymes. Various applications of radioisotopes are being continued. Certain technologies and processes developed in the Centre were transferred to commercial agencies for large scale exploitation. (M.G.B.)

  9. Recovery of uranium and thorium from secondary resources

    In the present paper an effort has been made to briefly describe first the effort that has been made at Rare Earths Division (RED), Alwaye, and Orissa Sands Complex (OSCOM) of IREL to recover nuclear grade ADU from uranium bearing monazite (0.35% U3O8) and other sources like thorium hydroxide (0.6% U3O8) and uranium fluoride concentrate (40%U). All these processes developed have similarity in the sense that they involve solvent extraction technology with novel combination of three different reagents falling in the category of acidic (PC88A) basic (ALAMINE-336) and neutral (TBP) extractants. Extensive R and D work in collaboration with uranium extraction division of BARC and plant scale trials have been completed to standardize the processes with respect to choice of ligands, composition of extractants, scrubbing/stripping reagents, number of stages as well as organic to aqueous ratios. Tons of ADU meeting the stringent specification have been produced and supplied to BARC for making uranium metal fuel for research reactors of the centre. In the case of uranium recovery from dilute phosphoric acid, the present paper is confined to use of a synergistic combination of DEHPA and TBP rather than well proven DEHPA-TOPO mixture. The primary motivation for examining this synergistic combination is the indigenous availability of both the solvent components since the supply of TOPO from the international market is likely to be denied. Based on the results of R and D test carried out at BARC large scale trials of various dilute phosphoric acids using experimental rigs consisting of carbon column, heat exchanger, commercial sized single stage mixer-settler, and plate separator are in progress at RED and OSCOM. IREL is also at advanced stage of pre-project activities and commercial negotiation with a number of host fertiliser companies like PPL, FACT and SPIC generating and using large volume of uranium bearing dilute phosphoric acid

  10. Mutation breeding in oilseeds and grain legumes in India: Accomplishments and socio-economic impact

    In India, oilseed and grain legume crops are important food components as they are major contributors for dietary oils and proteins. In order to generate genetic variability in these crops, mutation research using X-rays, gamma rays, fast and thermal neutrons is extensively carried out in several national institutes, state agricultural universities including Bhabha Atomic Research Centre (BARC), Mumbai since half a century. Besides cytogenetic studies, the era of direct mutants as crop varieties began in groundnut, mustard, pigeonpea and mungbean. Induction of modified traits and their incorporation in an ideal genotype was achieved by judicious use of induced mutation and hybridization techniques. So far about 100 mutant varieties in oilseeds and legumes have been released in India. Of these, BARC has developed 33 varieties by incorporating desirable traits like large seed, semi dwarf habit, high harvest index, better partitioning, fresh seed dormancy, yellow seed colour, drought tolerance, powdery mildew resistance, yellow mosaic virus resistance, bacterial pustule resistance. Many of the breeding programmes in national/state systems have been utilizing BARC varieties as parental materials/donors and developed several improved varieties. Several of these varieties have high patronage from the farming community and extensively grown in the country. Groundnut varieties have made considerable impact by giving record yields across the country. Further, mungbean varieties were also surging ahead by virtue of their resistance to yellow mosaic virus, Rhizoctonia root-rot and powdery mildew diseases with suitability to rice fallow situations. Blackgram variety TAU-1 has occupied maximum blackgram area in Maharashtra state. These crop varieties also facilitated farmers to develop newer cropping systems. Mutant varieties like Aruna of castor, Pusa 408 (Ajay), Pusa-413 (Atul), Pusa-417 (Girnar) of chickpea, Co-4, Maru Moth-1 of mothbean are among the important varieties of

  11. Over-pressure test on BARCOM pre-stressed concrete containment

    Bhabha Atomic Research Centre (BARC), Trombay has organized an International Round Robin Analysis program to carry out the ultimate load capacity assessment of BARC Containment (BARCOM) test model. The test model located in BARC facilities Tarapur; is a 1:4 scale representation of 540 MWe Pressurized Heavy Water Reactor (PHWR) pre-stressed concrete inner containment structure of Tarapur Atomic Power Station (TAPS) unit 3 and 4. There are a large number of sensors installed in BARCOM that include vibratory wire strain gauges of embedded and spot-welded type, surface mounted electrical resistance strain gauges, dial gauges, earth pressure cells, tilt meters and high resolution digital camera systems for structural response, crack monitoring and fracture parameter measurement to evaluate the local and global behavior of the containment test model. The model has been tested pneumatically during the low pressure tests (LPTs) followed by proof test (PT) and integrated leakage rate test (ILRT) during commissioning. Further the over pressure test (OPT) has been carried out to establish the failure mode of BARCOM Test-Model. The over-pressure test will be completed shortly to reach the functional failure of the test model. Pre-test evaluation of BARCOM was carried out with the results obtained from the registered international round robin participants in January 2009 followed by the post-test assessment in February 2011. The test results along with the various failure modes related to the structural members – concrete, rebars and tendons identified in terms of prescribed milestones are presented in this paper along with the comparison of the pre-test predictions submitted by the registered participants of the Round Robin Analysis for BARCOM test model

  12. Design and development of an ultrasonic pulser-receiver unit for non-destructive testing of materials

    The pulser/receiver constitutes the most vital part of an ultrasonic flaw detector or an ultrasonic imaging system used for inspection of materials. The ultrasonic properties of the material and resolution requirements govern the choice of the frequency of ultrasound that can be optimally used. The pulser/receiver in turn decides the efficiency of excitation of the transducer and the overall signal to noise ratio of the system for best sensitivity and resolution. A variety of pulsers are used in the ultrasonic instruments employed for materials inspection. This report describes a square wave type of an ultrasonic pulser-receiver unit developed at Ultrasonic Instrumentation Section, Electronics Division, BARC. It has been primarily designed for excitation of the transducer that is used with a multi-channel ultrasonic imaging system ULTIMA 100M targeted for inspection of SS403 billets, which are in turn used as the base material for fabrication of end fittings for coolant channels of pressurized heavy water nuclear reactors (PHWRs). The design of the pulser is based upon very fast MOSFETs, configured as electronic switches. The pulser is operated with a linear bipolar H.V. supply (+/- 500V max.). The receiver provides a 60 dB gain with a -3 dB BW of 40 MHz. This pulser/receiver unit has been successfully interfaced with a 4 channel ULTIMA 100 M4 multichannel ultrasonic C-scan imaging system, also designed and developed by the authors at Ultrasonic Instrumentation Section (Electronics Division, BARC) and supplied to Centre for Design and Manufacturer - CDM, BARC. This system is being regularly used in C-scan imaging mode for volumetric inspection of SS403 billets for end fittings of 500 MWe PHWRs. (author)

  13. Experimental and theoretical studies in Molten Salt Natural Circulation Loop (MSNCL)

    High Temperature Reactors (HTR) and solar thermal power plants use molten salt as a coolant, as it has low melting point and high boiling point, enabling us to operate the system at low pressure. Molten fluoride salt and molten nitrate salt are proposed as a candidate coolant for High Temperature Reactors (HTR) and solar power plant respectively. BARC is developing a 600 MWth pebble bed high temperature reactor, cooled by natural circulation of fluoride salt and capable of supplying process heat at 1000°C to facilitate hydrogen production by splitting water. Beside this, BARC is also developing a 2MWe solar power tower system using molten nitrate salt. With these requirements, a Molten Salt Natural Circulation Loop (MSNCL) has been designed, fabricated, installed and commissioned in Hall-7, BARC for thermal hydraulic, instrumentation development and material compatibility related studies. Steady state natural circulation experiments with molten nitrate salt (mixture of NaNO3 and KNO3 in 60:40 ratio) have been carried out in the loop at different power level. Various transients viz. startup of natural circulation, step power change, loss of heat sink and heater trip has also been studied in the loop. A well known steady state correlation given by Vijayan et. al. has been compared with experimental data. In-house developed code LeBENC has also been validated against all steady state and transient experimental results. The detailed description of MSNCL, steady state and transient experimental results and validation of in-house developed code LeBENC have been described in this report. (author)

  14. Radiological safety experience in nuclear fuel cycle operations at Bhabha Atomic Research Center, Trombay, Mumbai, India

    Activities at Bhabha Atomic Research Centre (BARC), Mumbai, cover nuclear fuel cycle operations based on natural uranium as the fuel. The facilities include: plant for purification and production of nuclear grade uranium metal, fuel fabrication, research reactor operation, fuel reprocessing and radioactive waste management in each stage. Comprehensive radiation protection programmes for assessment and monitoring of radiological impact of these operations, both in occupational and public environment, have been operating in BARC since beginning. These programmes, based on the 1990 ICRP Recommendations as prescribed by national regulatory body, the Atomic Energy Regulatory Board (AERB), are being successfully implemented by the Health, Safety and Environment Group, BARC. Radiation Hazards Control Units attached to the nuclear fuel cycle facilities provide radiation safety surveillance to the various operations. The radiation monitoring programme consists of measurement and control of external exposures by thermoluminescent dosimeters (TLDs), hand-held and installed instruments, and internal exposures by bioassay and direct whole body counting using shadow shield counter for beta gamma emitters and phoswich detector based system for plutonium. In addition, an environmental monitoring programme is in place to assess public exposures resulting from the operation of these facilities. The programme involves analysis of various matrices in the environment such as bay water, salt, fish, sediment and computation of resulting public exposures. Based on the operating experience in these plants, improved educating and training programmes for plant operators, have been designed. This, together with the application of new technologies have brought down individual as well as average doses of occupational workers. The environmental releases remain a small fraction of the authorised limits. The operating health physics experience in some of these facilities is discussed in this paper

  15. Report on R and D activities of Health Physics Division 1994-1995

    This report is a compilation of the activities and also of the results of various R and D programmes of the Health Physics Division of Bhabha Atomic Research Centre (BARC) during the period 1994-1995. The topics covered are: environmental studies, radiation dosimetry- internal and external, operational health physics and nuclear safety, instruments and techniques, radiation physics, mathematical modelling and software development, micrometeorology and industrial hygiene. The matter is presented in the form of abstracts with the publication details. Also included are extracts from IAEA research agreements and the summary of theses submitted by the staff members of the Division during the above period

  16. Research within the coordinated programme on neutron scattering techniques in applied research

    This paper reviews developments of neutron scattering studies at Bhabha Atomic Research Centre (BARC) over the past two decades through utilisation of Apsara and Circus reactor facilities. Salient results in neutron crystallography, magnetic diffraction and inelastic neutron scattering will be presented highlighting progressive involvement in more and more complex studies. The growth of non-neutronic activities as a natural outcome of overall necessity and interest of investigators will be indicated. A description of facilities planned at R5 and the nature of studies that are likely to be taken up at R5 will be briefly discussed. (author)

  17. Electro-magnetic design and simulation of wall current monitor sensor for LEHIPA

    Beam diagnostic instruments are essential component of any accelerator. Wall current monitors (WCMs) are common beam diagnostic tools used for acquiring the temporal distribution of the charged particle bunches. This paper discusses the electro-magnetic design and simulation results of Wall current Monitor sensor being developed at Electronics Division, BARC with a bandwidth from 16.9 MHz to 30 GHz. As per the simulation results, output of the sensor for a 0.30A peak current bunched beam will be 0.8 Vpeak to peak. The simulations were carried out for Eigen modes, Particle In Cell (PIC) and Wake-field simulations using CST Microwave Studio Suite. (author)

  18. Facilities Enhancement for IPY at Barrow

    Sheehan, G.; Brown, J.; Coakley, B.; Zak, B.


    In connection with the International Polar Year, research facilities at Barrow have been markedly enhanced. On June 1st, Sen. Ted Stevens cut the ribbon at the Grand Opening of the Barrow Arctic Research Center (BARC). The BARC currently covers 18,000 sq. ft, with future phases anticipated, including 8 research labs, a necropsy lab for animal studies, freezers for biological samples, a state-of-the-art-data system, a planned Internet II connection, meeting spaces, and offices. There is a platform on the roof of the facility for instrumentation, and a communications tower to provide WIFI connections to remote instrumentation located on the adjacent Barrow Environmental Observatory (BEO). The BEO, which consists of 11 square miles of tundra and coastline set aside for environmental and ecological research, has also seen recent enhancements. A power line and a hard- surfaced trail now provide easy access to the interior of the BEO. Users of the BEO (and others) also have access to many different data sets continuously collected at the NOAA Global Monitoring Division Barrow Station and the DOE ARM (Atmospheric Radiation Measurement) Climate Research Facility (see and respectively) also adjacent to the BEO. The National Weather Service Barrow Station also provides data of interest. Researchers submitting proposals to the National Science Foundation can include a request for the use of BARC and BEO facilities in their proposals. ARM facilities, recently augmented, can also be made available, but through arrangements made directly with ARM (; 505-845-8631 or; 505-284-9092). BARC, BEO and ARM facilities are available to other agency and international users as well. For more information, see, or contact Glenn Sheehan (907-852-4881, The BEO consists of land owned by Ukpeagvik Inupiat Corporation, which is owned by

  19. Laser study into and explanation of the direct-indirect target concept

    Borisenko N.G.


    Full Text Available The idea of direct-indirect target is experimentally tested with planar targets from LPI made of low-density metal foam (nanosnow or of nanoparticles (30% in plastic aerogels. The laser experiments in BARC have shown that compared to plain targets the foams of/with nanoparticles demonstrate: 1 better x-ray emissivity ; 2 smoother energy distribution over the target surface; 3 material flow from low-density wall being slower and more uniform; 4 active transverse energy transport over the target plane. These properties could be useful for hohlraums and direct-indirect concept.

  20. Utilisation of nuclear research reactor waste heat for desalination of seawater

    The desalination unit working on low temperature vacuum evaporation process, developed and fabricated in BARC, is being coupled to Cirus research reactor with a view to practically demonstrate the utilisation of research reactor waste heat, available at low temperature, for the desalination of sea water. Analysis indicates no adverse safety implications on the operation of the reactor due to coupling of the desalination unit. The product water produced by the proposed unit would be utilised for the demineralised water make up requirements of Cirus reactor

  1. Development and technology transfer of low cost nucleonic gauges in India

    Electronics Division of BARC has been engaged in the development of useful nucleonic control equipment for the mineral industry in India. One such unit where the technology has been transferred to an industrial entrepreneur having a good technical base in a gamma switch. The technology has been successfully implemented in a chemical plant under expert supervision for non-contact level gauging application. Though the technology holds a good promise for future market growth, much effort is needed to remove misunderstanding about the dangers of this technology. (author). 2 figs

  2. Hyperbilirubinemia in normal healthy donors

    Arora Veena; Kulkarni R; Cherian Susan; Pillai Raji; Shivali M


    The present study was carried out in B.A.R.C. Hospital Blood Bank over a span of five years, and includes 2734 donors. All the bags were screened for HIV, HBsAg, HCV and VDRL and the plasma in the pilot tubes of the blood bags was observed to detect any abnormality in color. In 27 cases plasma was found to be icteric and liver function tests were carried out on these samples. Two donors showed higher SGPT level, and were excluded. No significant increases in liver enzymes were recorded in the...

  3. Facility at CIRUS reactor for thermal neutron induced prompt γ-ray spectroscopic studies

    Biswas, D. C.; Danu, L. S.; Mukhopadhyay, S.; Kinage, L. A.; Prashanth, P. N.; Goswami, A.; Sahu, A. K.; Shaikh, A. M.; Chatterjee, A.; Choudhury, R. K.; Kailas, S.


    A facility for prompt γ-ray spectroscopic studies using thermal neutrons from a radial beam line of Canada India Research Utility Services (CIRUS) reactor, Bhabha Atomic Research Centre (BARC), has been developed. To carry out on-line spectroscopy experiments, two clover germanium detectors were used for the measurement of prompt γ rays. For the first time, the prompt γ-γ coincidence technique has been used to study the thermal neutron induced fission fragment spectroscopy (FFS) in 235U(nth, f). Using this facility, experiments have also been carried out for on-line γ-ray spectroscopic studies in 113Cd(nth, γ) reaction.

  4. A report on the inter comparison of isotopic analyses by mass spectrometry for the laser enrichment of carbon-13

    A method has been standardized for the mass spectral analysis of (13C/12C) ratio in the isotopically enriched C2F4 photoproduct obtained by the CO2 laser photolysis of natural CF2HCI sample. For improving the quality of the spectra as well as enchancing the detection level of the product at very low concentrations, a pre-concentration technique has been developed by gas chromatography. Inter comparison of the results for analyses carried out with two different mass spectrometers, viz., a commercial instrument available at the Land PT Division and an indigenously built one by MS and ES, BARC showed a very good agreement. (author)

  5. Statistics of dose received by occupational personnel from neutron sources - 10 year study

    Personnel Monitoring Section, BARC conducts countrywide fast neutron personnel monitoring using CR-39 solid state nuclear track detector. About 1350 personnel working in a wide range of situations are being monitored presently for fast neutrons. Nearly 50% of the personnel monitored are working with isotopic neutron sources e.g. 241Am-Be (up to 740 GBq source strength) in industry and the remaining are connected with nuclear fuel cycle. This paper describes our experience with this personnel neutron monitor and presents the analysis of the neutron equivalent doses received by personnel working in industry during last 10 years and its contribution as compared to total equivalent dose. (author)

  6. Generation of handbook of multi-group cross sections of WIMS-D libraries by using the XnWlup2.0 software

    A project to prepare an exhaustive handbook of WIMS-D cross section libraries for thermal reactor applications comparing different WIMS-D compatible nuclear data libraries originating from various countries has been successfully designed. To meet the objectives of this project, a computer software package with graphical user interface for MS Windows has been developed at BARC, India. This article summarizes the salient features of this new software and presents significant improvements and extensions in relation to its first version [Ann Nucl Energ 29 (2002) 1735

  7. Development of high intensity ECR ion source for ADS

    Electron cyclotron resonance principle based ion source consists of plasma chamber, five electrode ion extraction system and high voltage ceramic insulation system. Five electrodes have complex geometry with water cooling arrangement and bimetallic joints. Beam diagnostic and beam dump system are inherent part of it to measure beam quality and current. This paper describes mechanical design and manufacturing features of plasma chamber, electrodes and faraday cup of proton source. Various joining techniques like braze welding, brazing, electron beam welding and diffusion bonding are used to manufacture electrodes and plasma chamber. Beam diagnostic chamber and beam dump chamber are designed, manufactured and helium leak tested at CDM, BARC. (author)

  8. Indigenous development of scanning electron microscope

    Scanning electron microscope (SEM) is a precision instrument and plays very important role in scientific studies. Bhabha Atomic Research Centre has taken up the job of development of SEM indigenously. Standard and commercially available components like computer, high voltage power supply, detectors etc. shall be procured from market. Focusing and scanning coils, vacuum chamber, specimen stage, control hardware and software etc. shall be developed at BARC with the help of Indian industry. Procurement, design and fabrication of various parts of SEM are in progress. (author)

  9. Selected bibliography on heavy water, tritiated water and hydrogen isotopes (1981-1992)

    Gopalakrishnan, V. T.; Sutawane, U. B.; Rathi, B. N.

    A selected bibliography on heavy water, tritiated water and hydrogen isotopes is presented. This bibliography covers the period 1981-1992 and is in continuation to Division's earlier report BARC-1192 (1983). The sources of information for this compilation are Chemical Abstracts, INIS Atom Index and also some scattered search through journals and reports available in our library. No claim is made towards exhaustiveness of this bibliography even though sincere attempts have been made for a wide coverage. The bibliography is arranged under the headings: (1) production, purification, recovery, reprocessing and storage; (2) isotope exchange; (3) isotope analysis; (4) properties; and (5) miscellaneous. Total number of references in the bibliography are 1762.

  10. Trace element study of kidney stones from subjects belonging to stone belt region of India

    Kidney stones obtained from six patients belonging to the stone belt region of India (Punjab) were analyzed for inorganic constituents using instrumental neutron activation analysis (INAA) and energy dispersive X-ray fluorescence (EDXRF) techniques. For INAA, samples were irradiated along with IAEA RM Soil 7 as reference standard in CIRUS reactor, BARC, Mumbai. Gamma activity of irradiated samples was measured using a 45% relative efficiency HPGe detector coupled to 8 k channel analyzer. EDXRF method was used for determination of concentration of Ca. The concentrations of ten elements namely Ca, Na, K, Mn, Co, Cr, Zn, Br, Sm and Cl, are reported and discussed. (author)