Natural radioelement solution by circulating groundwaters in the Stripa granite

Details Natural radioelement solution by circulating groundwaters in the Stripa granite Natural radioelement solution by circulating groundwaters in the Stripa granite

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.1791a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 8, pp.1791-1802

Computer Science

3

Scientific paper

Natural radioelement concentrations in groundwaters from the fracture flow regime in the Stripa granite were monitored during the period 1977-1986. Uranium concentrations from depths of 80 m or less and in minewaters from above the hydraulic sink produced by the deepest mining level (410 m), range from 10 to 90 ppb. 234 U / 238 U activity ratios are characteristic of chemical leaching processes at the shallower depths whilst at about 350 m groundwaters occur which have an additional component of 234 U by alpha-recoil processes. At greater depths, U concentrations are indicative of the changed redox conditions and are subject to activity ratio enhancement by the alpha-recoil process. Groundwater residence times may be estimated from the rate of such recoil solution of 234 U in zones where chemical leaching of U is not active. The 222 Rn contents of the minewaters are extremely high and can be related to the 222 Rn flux from fracture surfaces and the fracture width. The fracture apertures range from 10 mm for the shallow groundwater zone ( 222 Rn contents < 400 Bq kg -1 ) to 20 > m for water from the deepest borehole section ( 222 Rn content 100 kBq kg -1 ). The activity ratios 234 Th / 238 U , 210 Pb / 222 Rn and 210 Po / 222 Rn have been used to estimate residence times for Th, Pb and Po isotopes. Solution of Ra is controlled by chemical rather than alpha-recoil processes. The 226 Ra content of the groundwater increases with salinity and is well correlated with groundwater Ca content. The 228 Ra / 226 Ra activity ratios in the groundwaters suggest that water/rock interaction occurs predominantly with the average granitic matrix rather than with highly uraniferous fracture mineralisation. The behaviour of Ra, Th and Po isotopes may be used to assess that of homologous fission product and actinide constituents of nuclear wastes in groundwaters.

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