Radiation-induced decomposition of U(VI) phases to nanocrystals of UO"2 [rapid communication]

Details Radiation-induced decomposition of U(VI) phases to nanocrystals of UO"2 [rapid communication] Radiation-induced decomposition of U(VI) phases to nanocrystals of UO"2 [rapid communication]

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005e%26psl.240..521u&link_type=abstract

Earth and Planetary Science Letters, Volume 240, Issue 2, p. 521-528.

Computer Science

1

Scientific paper

U6+-phases are common alteration products, under oxidizing conditions, of uraninite and the UO2 in spent nuclear fuel. These U6+-phases are subjected to a radiation field caused by the α-decay of U, or in the case of spent nuclear fuel, incorporated actinides, such as 239Pu and 237Np. In order to evaluate the effects of α-decay events on the stability of the U6+-phases, we report, for the first time, the results of ion beam irradiations (1.0 MeV Kr2+) of U6+-phases. The heavy-particle irradiations are used to simulate the ballistic interactions of the recoil-nucleus of an α-decay event with the surrounding structure. The Kr2+-irradiation decomposed the U6+-phases to UO2 nanocrystals at doses as low as 0.006 displacements per atom (dpa). U6+-phases accumulate substantial radiation doses (˜1.0 displacement per atom) within 100,000 yr if the concentration of incorporated 239Pu is as high as 1 wt.%. Similar nanocrystals of UO2 were observed in samples from the natural fission reactors at Oklo, Gabon. Multiple cycles of radiation-induced decomposition to UO2 followed by alteration to U6+-phases provide a mechanism for the remobilization of incorporated radionuclides.

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