1991 年 40 巻 1 号 p. 38-41
A simple and reliable method for determination of 222Rn in natural water has been developed by using gamma ray spectrometric measurement and a sample container particular designed. Samples were directly measured by a Ge detector coupled with the multichannel pulse height analyzer. The activities of 222Rn were determined by the area of 352 keV photopeak of 214Pb. At the same time, in order to evaluate the accuracy of this method, the activity of 222Rn in the same water sample extracted by organic solvent was measured by liquid scintillation counting (LSC) method. The observed activity of 222Rn measured by our method agreed with that by LSC method.