Radon concentration in ground waters in some areas of granite intrusion in various ages.
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概要
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It was reported that the later the intrusion age of granite is, the higher is its radium content. It may be supposed that ground water with high radon concentration is found in the area of granite with high radium content. The radon concentrations of ground waters in the areas of granite with various intrusion ages have been measured. No relation between radium content and intrusion age granite was observed in the present study. The following observations were made : the ground waters with high radon concentration exist in the area of very old granite, and those with low radon concentration exist in the area of very young granite. Areas where radon concentration in ground water is high are distributed on or near the area where fault lines and/or intrusive rock mass exist. In general, no relation between the radon concentration in ground waters and the alkalinity or electric conductivity was observed, and it was independent of chemical weathering.
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