Mathematics – Logic
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43.1681a&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 43, Issue 10, pp.1681-1686
Mathematics
Logic
3
Scientific paper
The concentrations of uranium. 226 Ra and 222 Rn were determined in 308 drilled and 58 dug wells in the Helsinki region. The study area was about 400 km 2 and geologically highly variable, with granites, amphibolites and migmatites the dominant rocks. The radioactivity of water in the dug wells was on a "normal" level, but in numerous drilled wells it was anomalously high. In 14 drilled wells the concentration of uranium exceeded 1000 g/l, the highest concentration being 14,870 g/l. For 222 Rn the maximum concentration was 880,000 pCi/l. The 226 Ra / 228 Ra and 230 Th / 232 Th activity ratios showed the isotopes of the uranium series to be dominant in the study area. A state of disequilibrium between 238 U and 234 U was very common in the samples. The 234 U / 238 U activity ratios varied in the range 1.0-4.0 regardless of the amount of uranium in the water. The conclusion can be drawn from the isotopic data that the high radioactivity of water is in some cases caused by primary uranium mineralizations, but mostly by uranium deposited in fissures of the bedrock. The paper includes a summary of the results of two studies carried out between 1967 and 1977.
Asikainen Matti
Kahlos H.
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