Effects Of Fast Neutron Irradiation And High Temperature On Beryllium Oxide
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Effects Of Fast Neutron Irradiation And High Temperature On Beryllium Oxide
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Author : R. P. Shields
language : en
Publisher:
Release Date : 1962
Effects Of Fast Neutron Irradiation And High Temperature On Beryllium Oxide written by R. P. Shields and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Beryllium oxide categories.
Effects Of Fast Neutron Irradiation And High Temperature On Beryllium Oxide
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Author :
language : en
Publisher:
Release Date : 1962
Effects Of Fast Neutron Irradiation And High Temperature On Beryllium Oxide written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with categories.
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).
Irradiation Of Sintered Beryllium Oxide To High Fast Neutron Doses At 110 650 And 1100 Deg C
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Author :
language : en
Publisher:
Release Date : 1964
Irradiation Of Sintered Beryllium Oxide To High Fast Neutron Doses At 110 650 And 1100 Deg C written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with categories.
Effect Of Radiation On Metals And Other High Melting Materials
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Author : Vladimir Vladimirovich Penʹkovskiĭ
language : en
Publisher:
Release Date : 1964
Effect Of Radiation On Metals And Other High Melting Materials written by Vladimir Vladimirovich Penʹkovskiĭ and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with Materials categories.
The Effect Of Neutron Irradiation On The Thermal Conductivity Of Beryllium Oxide
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Author : M. K. Cooper
language : en
Publisher:
Release Date : 1963
The Effect Of Neutron Irradiation On The Thermal Conductivity Of Beryllium Oxide written by M. K. Cooper and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with categories.
The Effect Of Neutron Irradiation On Beryllium Oxide
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Author : B. S. Hickman
language : en
Publisher:
Release Date : 1962
The Effect Of Neutron Irradiation On Beryllium Oxide written by B. S. Hickman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with categories.
Effects Of Neutron Irradiation On High Temperature Superconductors
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Author : John J Hammerer (Jr)
language : en
Publisher:
Release Date : 1988
Effects Of Neutron Irradiation On High Temperature Superconductors written by John J Hammerer (Jr) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
Neutron irradiation of high temperature superconductors was performed in order to determine the effects of nuclear weapons on these novel materials. This radiation could also be encountered in space radiation belts, fusion reactors and particle accelerators. Fluences used were on the order of 10 to the 18th power fast and thermal neutrons/sq cm. The result of the irradiation was a complete loss of observed superconductivity in YBa2Cu3O7 and ErBa2Cu3O7. A combination of gamma heating of 5 W/g and fast neutron flux imposed serve thermal stress on sample pellets. In two cases, the pellets were reduced to powder. Samples were prepared at the Naval Research Laboratory and the National Research Laboratory and the National Bureau of Standards. They were checked for the Meissner effect using magnetic levitation. The dc four terminal method was used to determine the transition temperature. Keywords: Yttrium compounds; Erbium compounds; Barium oxides; Copper compounds; Radiation effects; High temperature superconductivity. (JHD).
Neutron Diffraction Study Of High Temperature Annealed Beryllium Oxide
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Author : E. M. Kuleshov
language : en
Publisher:
Release Date : 1963
Neutron Diffraction Study Of High Temperature Annealed Beryllium Oxide written by E. M. Kuleshov and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with categories.
Nuclear Science Abstracts
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Author :
language : en
Publisher:
Release Date : 1975
Nuclear Science Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Nuclear energy categories.
NSA is a comprehensive collection of international nuclear science and technology literature for the period 1948 through 1976, pre-dating the prestigious INIS database, which began in 1970. NSA existed as a printed product (Volumes 1-33) initially, created by DOE's predecessor, the U.S. Atomic Energy Commission (AEC). NSA includes citations to scientific and technical reports from the AEC, the U.S. Energy Research and Development Administration and its contractors, plus other agencies and international organizations, universities, and industrial and research organizations. References to books, conference proceedings, papers, patents, dissertations, engineering drawings, and journal articles from worldwide sources are also included. Abstracts and full text are provided if available.
Analytical Description Of Growth Of Beryllium Oxide During Neutron Irradiation
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Author : Arthur William Pryor
language : en
Publisher:
Release Date : 1966
Analytical Description Of Growth Of Beryllium Oxide During Neutron Irradiation written by Arthur William Pryor and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Beryllium crystals categories.