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Koga, Taeko*; Morishima, Hiroshige*
JNC TJ1400 2004-001, 74 Pages, 2005/02
In the surroundings of the daily life, the effective internal doses due to the inhalation of radon, thoron and their decay nuclides account on average of the all world for about one-half of all natural sources of radiation. Radon and thoron, which are natural gaseous radioactive nuclides released out of rocks and soil etc. can spontaneously decay to other metal atoms, of which Po-214, Po-210 and Tl-208 are mainly the sources of exposure. We have carried out continuously the measurement of radon, thoron and their decay nuclides, and it's important of the study on the environmental movement and distribution of natural radioactive nuclides.The assessments of exposed dose by the natural radiation sources of the surrounding inhabitants and their outlooks should be understanded. In addition, we have canied out the measurements of the environmental dose rates on Japan for several years. We have selected and observed on Misasa spa district, Tottori pref., Kawanishi-shi, Hyogo pref., and Tamagawa spa district, Akita pref., and Higashi-Osaka-shi, Osaka pref., for CA, and reported these results on following ; (1) We continued time course variation of mean radon concentrations on same private house of Misasa spa district. Kawanishi-shi district and Higashi-Osaka-shi district. It tends that mean radon concentrations in air at their districts for 10 years were fluctuated low level on summer and rain season, and high on winter. (2) We have measured the radon concentrations in air with a set of indoor and outdoor on Misasa district. Radon concentrations in air on geologically formed granite layers were higher than those basaltic layers. It showed a similar tendency to the radon concentrations, although there were the low environmental dose rate levels at Misasa districts.
Koga, Taeko*; Morishima, Hiroshige*
JNC TJ1420 2003-002, 50 Pages, 2004/01
JNC-TJ1420-2003-002.pdf:11.07MB
no abstracts in English
Morishima, Hiroshige*; Koga, Taeko*
JNC TJ1420 2002-001, 73 Pages, 2002/03
JNC-TJ1420-2002-001.pdf:14.34MB
no abstracts in English
Morishima, Hiroshige*; Koga, Taeko*
PNC TJ1630 96-001, 27 Pages, 1996/03
no abstracts in English