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- W1554082402 abstract "The relative abundance of 226Ra and 228Ra were determined in the groundwater from 125 drilled wells containing from < 0.1 to 51.3 pCi/l of 226Ra. The determination of 228Ra was carried out with a liquid scintillation counter by measuring only the weakly energetic β particles emitted from 228Ra. Thus the interference from the daughter nuclides of 226Ra was avoided, without specific separation of 228Ac. The direct measurement of 228Ra made the method decisively simpler and faster in terms of the chemistry involved. The concentration of 228Ra was found to be independent of the amount of 226Ra present in the samples. The concentrations of 228Ra were nearly the same over the whole range of 226Ra concentrations and the average sol226Ra228Ra ratio sharply increased as the 226Ra content of water increased. The 226Ra228Ra ratio in the drilled wells varied from 0.3 to 26. Abnormally high 226Ra228Ra ratios were found in areas with known uranium deposits as well as in several drilled wells at other locations. The abnormally high 226Ra228Ra ratios present in groundwater suggest that the radioactivity anomaly is caused by uranium deposits and not by common rocks. In samples with a low radioactivity level the average 226Ra228Ra ratio was slightly below unity, corresponding to the typical U/Th ratio of granite, the most common kind of rock in the study area. The samples from the rapakivi area proved to be exceptional in that they had a low 226Ra228Ra ratio independent of the concentration of 226Ra." @default.
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- W1554082402 date "1981-08-01" @default.
- W1554082402 modified "2023-09-25" @default.
- W1554082402 title "Radium content and the activity ratio in groundwater from bedrock" @default.
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- W1554082402 doi "https://doi.org/10.1016/0016-7037(81)90230-1" @default.
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