Time-integrated monitoring of thoron progeny concentration around closed uranium mine sites in Japan.
Thoron progeny concentrations were determined using the time-integrated method around closed uranium mine sites in Japan. Because the time-integrated radon progeny monitor developed by the authors has the function to detect (212)Po, time-integrated monitoring of thoron progeny concentration is also available with the monitor. Assuming that contribution of (216)Po is negligible, equilibrium equivalent concentration of thoron (EECTn) is theoretically calculated from the etch-pit counts by (212)Po. The annual averages of EECTn observed in the investigation area were about 0.2 Bq m(-3), and they had no remarkable differences from one another.
Ishimori
Y
Y
Ningyo-toge Environmental Engineering Center, Japan Atomic Energy Agency, Tomata-gun, Okayama, Japan. ishimori.yuu@jaea.go.jp
D000396:Air Pollutants, Radioactive; D016902:Air Pollution, Indoor / Q000032:analysis*; D004781:Environmental Exposure; D004785:Environmental Pollutants; D004867:Equipment Design; D005843:Geography; D006798:Housing; D007564:Japan; D008906:Mining; D015233:Models, Statistical; D011834:Radiation Monitoring / Q000295:instrumentation*; D011874:Radiometry; D011886:Radon / Q000032:analysis*; D017687:Radon Daughters / Q000032:analysis*; D012306:Risk; D014501:Uranium / Q000032:analysis*
D000396:Air Pollutants, Radioactive; D004785:Environmental Pollutants; D017687:Radon Daughters; D014501:Uranium; D011886:Radon