Study on the environmental movements and distributions of natural radioactive nuclides on the granite area, II

Morishima, Hiroshige*; Koga, Taeko*

JNC TJ1400 99-030, 102 Pages, 1999/03

JNC-TJ1400-99-030.pdf:4.0MB

The natural radionuclides as K-40, uranium decay series and thorium decay series etc. are widely distributed on environment. but are not uniformly. These have various influences various forms as the sources of terrecial environmental radiation and of radon in to the human life environment and make wide fluctuation seasonal and spatially on the environment. As the environmental radiation is higher than that of the other west Japan where generally consists rich of granite strata. We deeply appreciate in regard to natural radiation and would carry the studies on the movement and distribution of natural radioactive nuclides on high background radiation area consisted rich granite strata. We have selected and observed and observed on Ikeda mineral spring district Ota-shi Shimane pref., Misasa spa district, Tohaku-gun, Tottori pref., Muro district Uda-gun, Hachibuse district, Nara-shi Nara pref. and Arima spa district Hyogo-pref. for HBRA, and Kawanishi-shi, Hyogo pref. and Higashi-osaka-shi, Osaka pref. as CA. We have carried out the study on the environmental movement and distribution of natural radioactive nuclides containing radon and decay nuclides, and reported these results on following.