The 222Rn content of groundwater in strata of the Plio-Pleistocene Osaka Group in the Sennan area, Japan

• Published in: Journal of hydrology (Amsterdam) Vol. 60; no. 1; pp. 197 - 207
• Main Authors: Fukui, M., Katsurayama, K.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 1983
• Subjects: Japan
• ISSN: 0022-1694; 1879-2707
• DOI: 10.1016/0022-1694(83)90022-7

Studies on the 222Rn content of groundwater were conducted to obtain knowledge of its distribution in the geosphere just below ground surface and below the depth of 100 m in the Osaka Group (Plio-Pleistocene). Samples analyzed from ten bore holes within 10 m depth below land surface showed that a sandy layer contained groundwater with consistent radon concentrations except for a few locations where the variations in the water level were large due to precipitation and/or the water level was within 2 m of ground surface. The average 222Rn concentration in groundwater within 10 m of land surface was found to be approximately equal to 1 3 to 3 5 of the highest concentration found in groundwater from a well penetrating 100–200 m (420 pCi/l −1).