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Thoron exhalation rates in areas of Japan

Shimo, Michikuni*; Ishimori, Yuu  ; Hosoda, Masahiro*; Tokonami, Shinji*

Thoron exhalation rates were measured with a newly made portable instrument at 33 areas in 7 prefectures of Japan. Thoron exhalation rates ranged from 49 to 4890 mBq m$$^{-2}$$ s$$^{-1}$$. Radon exhalation rates were also measured in many of the areas at the same time and ranged from 2.1 to 11 mBq m$$^{-2}$$ s$$^{-1}$$. Thoron exhalation rates showed a rough correlation with radon exhalation rates. Both exhalation rates also showed a rough correlation with geological features.



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Category:Environmental Sciences



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