Radium content and the 226 Ra / 228 Ra activity ratio in groundwater from bedrock

Details Radium content and the 226 Ra / 228 Ra activity ratio in groundwater from bedrock Radium content and the 226 Ra / 228 Ra activity ratio in groundwater from bedrock

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45.1375a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 45, Issue 8, pp.1375-1381

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Scientific paper

The relative abundance of 226 Ra and 228 Ra were determined in the groundwater from 125 drilled wells containing from < 0.1 to 51.3 pCi/l of 226 Ra. The determination of 228 Ra was carried out with a liquid scintillation counter by measuring only the weakly energetic particles emitted from 228 Ra. Thus the interference from the daughter nuclides of 226 Ra was avoided, without specific separation of 228 Ac. The direct measurement of 228 Ra made the method decisively simpler and faster in terms of the chemistry involved. The concentration of 228 Ra was found to be independent of the amount of 226 Ra present in the samples. The concentrations of 228 Ra were nearly the same over the whole range of 226 Ra concentrations and the average ratio sharply increased as the 226 Ra content of water increased. The 226 Ra / 228 Ra ratio in the drilled wells varied from 0.3 to 26. Abnormally high 226 Ra / 228 Ra ratios were found in areas with known uranium deposits as well as in several drilled wells at other locations. The abnormally high 226 Ra / 228 Ra 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 226 Ra / 228 Ra 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 226 Ra / 228 Ra ratio independent of the concentration of 226 Ra.

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