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Isothermal release of tritium from neutron-irradiated Li/sub 2/O pellets

Abstract

Li/sub 2/O pellets irradiated with thermal neutrons were isothermally annealed to release tritium in a helium atmosphere at temperatures ranging from 673 to 1073 K. The release rates were found to significantly increase at elevated temperatures and to depend on the density of the Li/sub 2/O pellet. The overall diffusion coefficients of the release process were calculated using the cylindrical geometry model for the pellets as D(cm/sup 2/ s/sup -1/)=1.02 x 10/sup -3/ exp(-51.0 kJ mol/sup -1//RT)(90% theoretical density pellets), and D (cm/sup 2/ s/sup -1/)=2.64 x 10/sup -3/ exp(-46.5 kJ mol/sup -1//RT)(ca. 80% T.D. pellets) over the region 773 <= T <= 1073/sup 0/K. The result of the release experiment at 673/sup 0/K sugested that the diffusion rate was controlled by the decomposition of lithium hydroxide on the surface of Li/sub 2/O grains.
Publication Date:
Apr 01, 1986
Product Type:
Journal Article
Reference Number:
NLN-86-003723; EDB-86-166298
Resource Relation:
Journal Name: J. Nucl. Mater.; (Netherlands); Journal Volume: 138:2/3
Subject:
36 MATERIALS SCIENCE; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; LITHIUM OXIDES; FISSION PRODUCT RELEASE; POST-IRRADIATION EXAMINATION; TRITIUM; LOSSES; ANNEALING; ARRHENIUS EQUATION; BREEDING PELLETS; DIFFUSION; EXPERIMENTAL DATA; HIGH TEMPERATURE; PHYSICAL RADIATION EFFECTS; TEMPERATURE DEPENDENCE; THERMAL NEUTRONS; TIME DEPENDENCE; VERY HIGH TEMPERATURE; ALKALI METAL COMPOUNDS; BARYONS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CHALCOGENIDES; DATA; ELEMENTARY PARTICLES; EQUATIONS; FERMIONS; HADRONS; HEAT TREATMENTS; HYDROGEN ISOTOPES; INFORMATION; ISOTOPES; LIGHT NUCLEI; LITHIUM COMPOUNDS; NEUTRONS; NUCLEI; NUCLEONS; NUMERICAL DATA; ODD-EVEN NUCLEI; OXIDES; OXYGEN COMPOUNDS; RADIATION EFFECTS; RADIOISOTOPES; YEARS LIVING RADIOISOTOPES; 360206* - Ceramics, Cermets, & Refractories- Radiation Effects; 700206 - Fusion Power Plant Technology- Environmental Aspects
OSTI ID:
5349684
Research Organizations:
Tokyo Inst. of Tech., Japan. Research Lab. of Nuclear Reactor
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: JNUMA
Submitting Site:
NLN
Size:
Pages: 235-241
Announcement Date:
Oct 01, 1986

Citation Formats

O'Hira, Shigeru, Nagao, Hiroshi, Fujii, Yasuhiko, and Okamoto, Makoto. Isothermal release of tritium from neutron-irradiated Li/sub 2/O pellets. Netherlands: N. p., 1986. Web. doi:10.1016/0022-3115(86)90011-5.
O'Hira, Shigeru, Nagao, Hiroshi, Fujii, Yasuhiko, & Okamoto, Makoto. Isothermal release of tritium from neutron-irradiated Li/sub 2/O pellets. Netherlands. doi:10.1016/0022-3115(86)90011-5.
O'Hira, Shigeru, Nagao, Hiroshi, Fujii, Yasuhiko, and Okamoto, Makoto. 1986. "Isothermal release of tritium from neutron-irradiated Li/sub 2/O pellets." Netherlands. doi:10.1016/0022-3115(86)90011-5. https://www.osti.gov/servlets/purl/10.1016/0022-3115(86)90011-5.
@misc{etde_5349684,
title = {Isothermal release of tritium from neutron-irradiated Li/sub 2/O pellets}
author = {O'Hira, Shigeru, Nagao, Hiroshi, Fujii, Yasuhiko, and Okamoto, Makoto}
abstractNote = {Li/sub 2/O pellets irradiated with thermal neutrons were isothermally annealed to release tritium in a helium atmosphere at temperatures ranging from 673 to 1073 K. The release rates were found to significantly increase at elevated temperatures and to depend on the density of the Li/sub 2/O pellet. The overall diffusion coefficients of the release process were calculated using the cylindrical geometry model for the pellets as D(cm/sup 2/ s/sup -1/)=1.02 x 10/sup -3/ exp(-51.0 kJ mol/sup -1//RT)(90% theoretical density pellets), and D (cm/sup 2/ s/sup -1/)=2.64 x 10/sup -3/ exp(-46.5 kJ mol/sup -1//RT)(ca. 80% T.D. pellets) over the region 773 <= T <= 1073/sup 0/K. The result of the release experiment at 673/sup 0/K sugested that the diffusion rate was controlled by the decomposition of lithium hydroxide on the surface of Li/sub 2/O grains.}
doi = {10.1016/0022-3115(86)90011-5}
journal = {J. Nucl. Mater.; (Netherlands)}
volume = {138:2/3}
journal type = {AC}
place = {Netherlands}
year = {1986}
month = {Apr}
}