Radiation-enhanced release of uranium from accessory minerals in crystalline rocks

Details Radiation-enhanced release of uranium from accessory minerals in crystalline rocks Radiation-enhanced release of uranium from accessory minerals in crystalline rocks

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49..871p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 49, Issue 3, pp.871-876

Physics

3

Scientific paper

Implantation of low energy (~ 1 keV/amu) Pb ions, simulating -recoils, greatly increases the dissolution rate of U-bearing minerals in aqueous solutions above a critical dose ~5 × 10 12 ions·cm -2 . A Monte-Carlo code of etching indicates that this phenomenon corresponds to a percolation threshold due to the accumulation of ion-induced defects above a critical concentration. Such a radiationenhanced dissolution could be produced by -recoil damage in U-rich accessory minerals of sufficient U-content and/or age. Therefore, this process could be the primary source of this element in the formation of U ores associated with crystalline rocks.

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