Diffusion and trapping of rare gas xenon in calcium fluoride single crystals

Ong, Alex; Elleman, T.S.

doi:10.1016/0022-3115(72)90024-4

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1972

1999

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Cited by 16 publications

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Xenon-133 diffusion and trapping in single-crystal uranium dioxide

Carter

Driscoll

Elleman

1972

Phys. Stat. Sol. (a)

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The diffusion of 133Xe in single‐crystal UO2 was studied following the recoil injection of the 133Xe from an external fissionable source. This technique was selected to minimize the diffusion path to a free surface and decrease the possibility of gas‐atom trapping during the diffusion anneals. Gas release results consistent with classical diffusion solutions were obtained over the entire heating cycle for each release curve and no “burst effect” was observed. The results were consistent with D = 2.88 × 103 exp [(−4.78 ± 0.15) eV/kT] cm2s−1 over the temperature range 1065 to 1300 °C. Increasing the recoil concentration to 3 × 1012 fission fragments cm−2 (3 × 10−8 fission atom fraction) produced anomalies in the gas release curves which probably resulted from gas‐atom trapping. Using parameters measured elsewhere for rare gas trapping in UO2 and CaF2, it was shown that many of the rare gas diffusion coefficients reported in the literature for UO2 appear to be too low as a consequence of gas‐atom trapping.

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