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Fast Neutron And Gamma Spectrum And Dose In Beryllium Oxide
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Book Synopsis Fast-Neutron and Gamma Spectrum and Dose in Beryllium Oxide by :
Download or read book Fast-Neutron and Gamma Spectrum and Dose in Beryllium Oxide written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutron and gamma penetrations through and behind BeO were measured. Neutron spectra measurements by threshold foil techniques indicated practically no change in the fast-neutron spectrum above 2.5 Mev in BeO. Thus, beryllium appears to lie in the transition region between the very light elements that harden a fission spectrum and the heavier elements that soften it. The ratio of fast-neutron fluxes below and above 2.5 Mev increased rapidly with distance through the BeO. Information indicated that the flux peaked at around 1.5 to 2.5 Mev. In this energy range the scattering cross section of beryllium goes through a minimum. Fast neutron dose measurements through BeO were compared with those calculated by the moments method. The removal cross section for BeO was determined from fast-neutron dose rates measured in the water behind the slabs. Gamma dose rates were measured through and be hind the BeO slabs with a carbon chamber. The gamma dose rate decreased with a relaxation length of about 11 cm near the source. The relaxation length increased with distance through BeO, indicating spectrum hardening. Gamma spectra were measured at intervals behind BeO slabs with a collimated sodium icdide crystal. The 6.8 and 3.41 Mev beryllium capture gamma rays became dominant as the distance through the BeO increased. Thermal flux was measured through and behind the BeO with both a fission chamber and gold foils. Thermal flux distributions for these tests were calculated by a multilevel diffusion code. The calculations differ from the experiment at large penetration distances through BeO. (auth).
Book Synopsis Effects of Fast-neutron Irradiation and High Temperature on Beryllium Oxide by : R. P. Shields
Download or read book Effects of Fast-neutron Irradiation and High Temperature on Beryllium Oxide written by R. P. Shields and published by . This book was released on 1962 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Radiation Dose Rates from Plutonium Oxide - Beryllium Oxide Mixtures by :
Download or read book Radiation Dose Rates from Plutonium Oxide - Beryllium Oxide Mixtures written by and published by . This book was released on 1966 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fast neutron, gamma and X-ray does rates from various mixtures of plutonium oxide and beryllium oxide were measured and compared with theoretical estimates of fast neutron emission. The results obtained have been used to estimate the radiological hazard that may be encountered in the small scale manufacture of plutonium oxide - beryllium oxide fuel pellets. (auth).
Book Synopsis Irradiation of Sintered Beryllium Oxide to High Fast-Neutron Doses at 110, 650, and 1100 Deg. C by :
Download or read book Irradiation of Sintered Beryllium Oxide to High Fast-Neutron Doses at 110, 650, and 1100 Deg. C written by and published by . This book was released on 1964 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Calculation of Fast-neutron Flux Emerging from a Reactor Beamhole and Comparison with Experiment by : Harvey S. Bloomfield
Download or read book Calculation of Fast-neutron Flux Emerging from a Reactor Beamhole and Comparison with Experiment written by Harvey S. Bloomfield and published by . This book was released on 1967 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Fast-Neutron Irradiation and High Temperature on Beryllium Oxide by :
Download or read book Effects of Fast-Neutron Irradiation and High Temperature on Beryllium Oxide written by and published by . This book was released on 1962 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Specimens of 0.428 to 1.18 in. dia. BeO were irradiated at 1.4 x 10/sup 20/ to 2.8 x 10/sup 21/ fast neutrons/cm/ (>1 Mev), with irradiation times of 2.03 x 105 to 5.60 x 106 sec, at 110 to 1025 C, and gamma heat generation rates of 18 to 25 w/g. The greatest damage appeared in bodies irradiated for high neutron doses at low temperatures. Greater doses could be tolerated at higher temperatures. Specimens irradiated at 110 deg C powdered at an accumulated dose of 1.5 x 10/sup 21/ 1.1 x 10/sup 21/ neutrons/cm/sup 2/ and at 737 deg C at a dose of 1.6 x 10 /sup 21/ neutrons/cm/sup 2/ remained intact. Specimens irradiated at 827 to 950 deg C at a dose of 2.1 to 2.6 x 10/sup 21/ neutrons/cm/sup 2/ fractured. Changes in linear dimensions up to 4% were observed. X-ray diffraction measurements revealed changes in the c lattice parameter up to 7 x 10-3 DELTA c/c0 for material irradiated at 110 deg C but only 1 to 2 x 10-3 DELTA c/co at 444 to 1025 deg C. The DELTA c/c0 value appeared to saturate at a dose of 3 x 10/sup 20/ neutrons/cm/sup 2/ in the latter temperature range. All temperatures above 444 deg C were equally effective in suppressing the DELTA c/c0 values. Changes in the a parameter were smaller by a factor of 7. He was retained even at irradiation temperatures of 1025 deg C. Gases could be removed only by dissolving the BeO in fused salt. The He content of the BeO varied linearly with fast-neutron dose up to 1.6 x 10/sup 21/ neutrons/ cm/sup 2/, with a slope of 205 standard mu l per g of BeO per 10 neutrons/cm/sup 2/. The tritium content of BeO irradiated at 110 deg C followed a (neutrons/cm) curve up to 6.4 ppm at 2.1 x 10 neutrons/cm/sup 2/. Specimens irradiated above 444 deg C contained much less tritium. Voids 0.1 to 0.3 mu in diameter which were not in the original material were found by electron microscopy in the interior of grains and at grain boundaries. No evdence of chemical decomposition was observed. Radial temperature differences during irradiation increased by 50 to 100%, indicating a decrease in thermal conductivity. It was concluded that the observed changes could be caused either by gas generation or atomic displacements. The hypothesis that thermal stress alone produced failure was rejected. Results indicate that great caution must be exercised in designing BeO moderators for nuclear reactors. Under some conditions physical deterioration occurs to such a degree as to render the material unsuitable for use. For greatest life the moderator should be kept above 400 deg C, and probably 800 to 1000 deg C is more desirable. The design of the irradiation assembly is described. Temperatures were controlled by varying the composition of a helium- argon mixture in an annulus. Sixtythree specimens were irradiated in six assemblies. (auth).
Book Synopsis Miscellaneous Publication - National Bureau of Standards by : United States. National Bureau of Standards
Download or read book Miscellaneous Publication - National Bureau of Standards written by United States. National Bureau of Standards and published by . This book was released on 1934 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bibliography, Subject Index, and Author Index of the Literature Examined by the Radiation Shielding Information Center by : S. K. Penny
Download or read book Bibliography, Subject Index, and Author Index of the Literature Examined by the Radiation Shielding Information Center written by S. K. Penny and published by . This book was released on 1965 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Radiation on Metals and Other High Melting Materials by : Vladimir Vladimirovich Penʹkovskiĭ
Download or read book Effect of Radiation on Metals and Other High Melting Materials written by Vladimir Vladimirovich Penʹkovskiĭ and published by . This book was released on 1964 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nuclear Studies of the Nuclear Light Bulb Rocket Engine by : Thomas S. Latham
Download or read book Nuclear Studies of the Nuclear Light Bulb Rocket Engine written by Thomas S. Latham and published by . This book was released on 1969 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report investigates uranium 233 critical mass requirements, neutron kinetic behavior, and neutron and gamma ray heating rates for nuclear light bulb rocket engine.
Book Synopsis Neutron Generators for Analytical Purposes by : International Atomic Energy Agency
Download or read book Neutron Generators for Analytical Purposes written by International Atomic Energy Agency and published by IAEA Radiation Technology Repo. This book was released on 2012 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication addresses recent developments in neutron generator (NG) technology. It presents information on compact instruments with high neutron yield to be used for neutron activation analysis (NAA) and prompt gamma neutron activation analysis in combination with high count rate spectrometers. Traditional NGs have been shown to be effective for applications including borehole logging, homeland security, nuclear medicine and the on-line analysis of aluminium, coal and cement. Pulsed fast thermal neutron analysis, as well as tagged and timed neutron analysis, are additional techniques which can be applied using NG. Furthermore, NG can effectively be used for elemental analysis and is also effective for analysis of hidden materials by neutron radiography. Useful guidelines for developing NG based research laboratories are also provided in this publication.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fundamental Nuclear Energy Research by : U.S. Atomic Energy Commission. Division of Plans and Reports
Download or read book Fundamental Nuclear Energy Research written by U.S. Atomic Energy Commission. Division of Plans and Reports and published by . This book was released on 1964 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1970 with total page 1338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Publications, Reports, and Papers for 1966 from Oak Ridge National Laboratory by : F. M. O'Hara
Download or read book Publications, Reports, and Papers for 1966 from Oak Ridge National Laboratory written by F. M. O'Hara and published by . This book was released on 1967 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nuclear Power Reactor Instrumentation Systems Handbook by : Joseph M. Harrer
Download or read book Nuclear Power Reactor Instrumentation Systems Handbook written by Joseph M. Harrer and published by . This book was released on 1973 with total page 1052 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1982 with total page 900 pages. Available in PDF, EPUB and Kindle. Book excerpt:
