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POSTIRRADIATION RELEASE OF XENON-133 FROM SINGLE-CRYSTAL ALPHA ALUMINA

Technical Report ·
OSTI ID:4774157
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Postirradiation measurements of the release of Xe/sup 133/ recoiled into single-crystal alpha alumina during neutron irradiation in contact with UO/sub 2/ powder were made at 500 to 1500 deg C. Exposures of 7 x 10/sup 8/ to 1.5 x 10/sup 18/ fissionfragment recoils per cm/sup 2/ were employed. The initial release of Xe/sup 133/ from alpha alumina during a postirradiation heat treatment is very rapid, giving rise to the burst. After several minutes, the release rate decreases, and the cumulative fractional release becomes a linear function of the square root of the heating time. This behavior is observed both during the initial heating of the specimen and during its subsequent heat treatments at higher temperatures. Although the burst effect is not expected from simple diffusion theory, a linear cumulative fractional release with the square root of the heating time is expected. The activation energy calculated from the temperature dependence of the diffusion coefficients derived from the linear portion of the release curves is 64 plus or minus 18 kcal g mole for an exposure of 3 x 10/sup 13/ fission recoils per cm/sup 2/ at 1040 to 1550 deg C. An activation energy of 9.2 plus or minus 2 kcal per g mole is calculated for diffusion below 1040 deg C at this exposuie. For higher radiation exposures the low-activation-energy process is absent. (auth)
Research Organization:
Battelle Memorial Inst., Columbus, Ohio
DOE Contract Number:
W-7405-ENG-92
NSA Number:
NSA-16-032138
OSTI ID:
4774157
Report Number(s):
BMI-1592
Country of Publication:
United States
Language:
English

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Related Subjects

ACTIVATION ENERGY
ALUMINUM OXIDES
CRYSTALS
DIFFUSION
DISTRIBUTION
FISSION PRODUCTS
HEAT TREATMENTS
HEATING
IRRADIATION
LEAKS
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
NEUTRON BEAMS
POWDERS
QUANTITY RATIO
RADIATION EFFECTS
RECOILS
TEMPERATURE
URANIUM DIOXIDE
XENON 133