Alpha-recoil damage and solution effects in minerals: uranium isotopic disequilibrium and radon release

Details Alpha-recoil damage and solution effects in minerals: uranium isotopic disequilibrium and radon release Alpha-recoil damage and solution effects in minerals: uranium isotopic disequilibrium and radon release

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.2191f&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, Issue 11, pp.2191-2201

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9

Scientific paper

Preferential loss relative to 238 U of 234 U from rocks into solutions has long been attributed to recoiling alpha-emitting nuclei. Using fission-track activation direct evidence has been obtained for two mechanisms: 1. (1) recoil ejection from grains. 2. (2) release by natural etching of alpha-recoil tracks. Tests of the second mechanism have been done using 239 PuO 2 sources to implant 235 U as recoiling nuclei. These particles leave similar tracks to the recoils from 238 U decay, and the implanted nuclei are chemically the same as the 234 U that results in nature. Another virtue of 235 U nuclei is their fissionability, which allows them to be sensitively detected by neutron irradiation followed by etching of the induced particle tracks. The 235 U nuclei are implanted in a mineral, the mineral is exposed to a solution and both the mineral and the solution are tested for their 235 U content. Preferential removal of recoil nuclei has been observed in 6 of 7 natural minerals that have been studied in 24-hour treatments. The increase with time of the fraction of the recoil nuclei that is released has been measured in muscovite. The observations also imply that radon emanation occurs by the same two mechanisms.

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