Mechanism of transport of U-Th series radioisotopes from solids into ground water

Details Mechanism of transport of U-Th series radioisotopes from solids into ground water Mechanism of transport of U-Th series radioisotopes from solids into ground water

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48..395r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 48, Issue 2, pp.395-399

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6

Scientific paper

A set of experiments conducted to understand the mechanism responsible for release of large quantities of 222 Rn from solids into ground water reveals that a major part of Rn moving into the intergranular water comes from within the grains (solids), not by recoil from the outer surface. We have deduced that the solids we have studied are permeated, to a varying degree, with pores having very large wall area but very small volume, i.e. , having width of opening of the order of 10-20 nm. Recoil from the walls of these openings introduces Rn and other isotopes into the water contained in these openings (nanopores). Radon, an inert gas, is able to diffuse from nanopore water into the intergranular water in substantial quantities. In contrast, nongaseous isotopes of the U-Th series recoiled into the nanopore water in comparable quantities are adsorbed within the nanopores on the large internal area available there. Further, it appears that a large part of the inventory of long-lived isotopes produced by decay of radon in intergranular water is slowly transported to and adsorbed on the large internal area available in the nanopores. Thus, most of the inventory of all long-lived non-gaseous emanation isotopes exist in an adsorbed state in the nanopores, while radon is located in intergranular water.

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