THE EFFECT OF IONIZING RADIATION ON URANOPHANE
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dc.contributor.author | Utsunomiya S. | |
dc.contributor.author | Wang L.-M. | |
dc.contributor.author | Ewing R.C. | |
dc.contributor.author | Douglas M. | |
dc.contributor.author | Clark S.B. | |
dc.date.accessioned | 2021-12-02T03:58:05Z | |
dc.date.available | 2021-12-02T03:58:05Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=14384366 | |
dc.identifier.citation | American Mineralogist, 2003, 88, 1, 159 | |
dc.identifier.issn | 0003-004X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/32613 | |
dc.description.abstract | The susceptibility of uranophane, a uranyl sheet silicate, ideally Ca(UO2)2(SiO3OH)2(H2 (H2O)5, to ionizing irradiation has been evaluated by systematic irradations with 200 ke V electrons over the temperature range 94 to 573 K. High-resolution transmission electron microscopy revealed that amorphous domains formed locally, concurrently with a gradual disordering of the entire structure. Amorphization doses at room temperature were 1.1 × 1010 Gy for uranophane, 1.3 × 1010 Gy for Sr-substituted uranophane, and 1.9 × 1010 Gy for Eu-substituted uranophane; thus, there was an increase in amorphization dose with increasing average atomic mass. At 573 K, the amorphization dose of uranophane was 2.0 × 1011 Gy. The temperature dependence of the amorphization dose of uranophane has two stages; ≤413 K and >413 K. Based on a defect accumulation model, the effective activation energies for amorphization at each stage are 0.0440 eV and 0.869 eV, respectively. This suggests that the presence of H2O (and OH-) reduce the energy deposition required to cause amorphization. Above 413 K, the amorphization dose increased due to the absence of H2O and OH- and the absence of radiolytic decomposition of H2O and OH-. | |
dc.subject | Uranophane | |
dc.title | THE EFFECT OF IONIZING RADIATION ON URANOPHANE | |
dc.type | Статья |
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