Kametani K, Matsumura T
Radioisotopes. 1983 Jan;32(1):18-21.
The 238U, 234U, 226Ra and 228Ra concentrations in the spring waters at the Sanbe and Misasa districts in Japan were investigated. In the spring water at Sanbe, high concentrations of the natural nuclides described above were found in which the maximum levels of 238U and 234U were 0.44 Bq/l and 0.91 Bq/l, respectively, while 234U/238U showed the range of 1.50 approximately 2.37. The maximum levels of 226Ra and 228Ra were found to be 1.95 Bq/l and 0.76 Bq/l, respectively, while 228Ra/226Ra mean value was 0.49. In the spring water at Misasa, the maximum levels of 226Ra and 228Ra were 0.60 Bq/l and 0.41 Bq/l, respectively, and 228Ra/226Ra mean value was 0.55. From the above-mentioned result and the fact that 228Ra is a decayed product of 232Th, it is thought that the rocks of the Sanbe and Misasa districts contain much uranium and thorium.
对日本三本和御所地区温泉水中的238U、234U、226Ra和228Ra浓度进行了调查。在三本的温泉水中，发现上述天然核素的浓度较高，其中238U和234U的最高水平分别为0.44 Bq/l和0.91 Bq/l，而234U/238U的范围为1.50至2.37。226Ra和228Ra的最高水平分别为1.95 Bq/l和0.76 Bq/l，而228Ra/226Ra的平均值为0.49。在御所的温泉水中，226Ra和228Ra的最高水平分别为0.60 Bq/l和0.41 Bq/l，228Ra/226Ra的平均值为0.55。根据上述结果以及228Ra是232Th的衰变产物这一事实，可以认为三本和御所地区的岩石含有大量的铀和钍。
