Thoron in the environment and its related issues |
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Authors: | Shinji Tokonami |
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Institution: | (1) National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan |
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Abstract: | Since radon is internationally noted as the second cause of lung cancer, many countries are trying about to solve the problem
worldwide. In addition, a new evidence of lung cancer risk has been recently found out with a low level below 200 Bq m−3. Thus the action level will have to be set lower than before. Importance of radon exposure has been further recognized and
accurate radon concentrations will be required. Recently thoron has also been recognized from the viewpoint of accurate radon
measurements. The present paper describes specification of the NIRS radon and thoron chambers, passive measurement technique
of radon and thoron and thoron interference on radon measurements from both experimental studies and field experiences on
epidemiological study area.
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Keywords: | Radon thoron measurement exposure lung cancer epidemiology |
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