ラジウム,ラドン量より求めたδRn項による鉱泉中の過剰量ラドンの存在に対する一考察

概要

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A new simulaneous determination method of Ra and Rn in one water sample is proposed, consisting of extraction of Rn with toluene and application of integral counting method with a liquid scintillation counter. Based upon these results, δRn term is defined as (Rn-Rn(eq))/ ^0Ra, where Rn represents the determined amount of Rn, Rn(eq), the calculated amounts of Rn supposed to be equilibrated with the actual amount of Ra, and ^0Ra, the amount of Ra per evaporation residue of 1 g. The relationships between δRn term and water temperature of mineral springs and geothermal well were established and the characteristic nature of each group of them were clearly shown. A new explanation on the presence of exessive amount of Rn compared with that of Ra found was given by assuming that hot springs are mostly formed by mixing the original thermal water with the ground water containing high amount of Rn. The ground water, especially deep layer one, can easily dissolve and concentrate Rn by passing through the wide range of surroundings. Conclusively it can be said that Rn will migrate not only by recoil and diffusion but also by transportation of ground water over distance. The ground water is a main source of high amount of Rn.
日本地球化学会の論文
1978-12-30