| Budget Amount *help |
¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
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| Outline of Final Research Achievements |
Lung dose for inhaled radon-222 progeny varies with aerosol parameters in the environment and with subject related parameters such as breathing rate and airway dimension. The purpose of this study is to develop a computer code used for calculating the lung dose per unit exposure to radon-222 progeny in the home and the work places. An updated ICRP human respiratory tract model was incorporated in the present computer code. By using this code, sensitivity analysis in the calculation of lung dose was performed with aerosol parameters. This analysis made clear that evaluation of an unattached fraction of radon progeny plays an important role to determine a dose conversion coefficient inherent to a specific environment. Furthermore, an annual effective dose attributable to the inhalation of radon progeny in Japan was estimated by taking account of the indoor and outdoor radon concentrations in Japan and the physical characteristics and the living hours of the Japanese people.
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