Physics
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45..201a&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 45, Issue 2, pp.201-206
Physics
1
Scientific paper
Approximately one thousand drilled wells were investigated for their natural radioactivity. The determinations of 238 U, 234 U, 226 Ra and 222 Rn from 310 samples showed a high state of radioactive disequilibrium between the members of the uranium series present in water. The 238 U / 226 Ra activity ratio usually fell in the range 1-20 and the 238 U / 222 Rn activity ratio in the range 1-20 × 10 -4 , the highest activity ratios being from samples with an elevated uranium content. The 234 U / 238 U activity ratio varied between 0.76 and 4.67, the most frequent values showing a 60% excess of 234 U in the samples. Most of the 234 U / 238 U activity ratios near unity were found in samples with a high uranium content. Several drilled wells with anomalously high uranium contents were found in southern Finland. The average 226 Ra and 222 Rn contents of these wells were not exceptionally high, which suggests high mobility of uranium in groundwater from the areas involved.
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