State of disequilibrium between 238U, 234U, 226Ra and 222Rn in groundwater from bedrock |
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Authors: | Matti Asikainen |
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Affiliation: | Institute of Radiation Protection, P.O. Box 268, SF 00101 Helsinki 10, Finland |
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Abstract: | Approximately one thousand drilled wells were investigated for their natural radioactivity. The determinations of 238U, 234U, 226Ra and 222Rn from 310 samples showed a high state of radioactive disequilibrium between the members of the uranium series present in water. The activity ratio usually fell in the range 1–20 and the activity ratio in the range 1–20 × 10?4, the highest activity ratios being from samples with an elevated uranium content. The activity ratio varied between 0.76 and 4.67, the most frequent values showing a 60% excess of 234U in the samples. Most of the 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 226Ra and 222Rn contents of these wells were not exceptionally high, which suggests high mobility of uranium in groundwater from the areas involved. |
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