Radon and Thoron exhalation rate map in Japan

Journal Article · Thu Aug 07 04:00:00 EDT 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2991202· OSTI ID:21152435

Masahiro, Hosoda ^[1]; Michikuni, Shimo; Kazuyuki, Minami; Kazutaka, Ejiri ^[2]; Masato, Sugino ^[3]; Masahide, Furukawa ^[4]; Masahiro, Fukushi ^[5]

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1. Chuoh College of Medical Technology, 3-5-12 Tateishi, Katsushika-ku, Tokyo, 124-0012 (Japan)
2. Fujita Health University, 1-98Dengakugakubo, Kutsukake-cho, Toyoake-shi, Aichi, 470-1192 (Japan)
3. Gumma Prefecture College of Health Sciences, 323-lKamioki-cho, Maebashi-shi, Gunma, 371-0052 (Japan)
4. University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa, 903-0213 (Japan)
5. Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo, 116-8551 (Japan)

Measurements of radon and thoron exhalation rates have been done using the radon and thoron exhalation rate measuring instrument adopting the accumulation method. We obtained the 111 data in the 40 sites of the 14 prefectures in Japan. The arithmetic average value of the radon and thoron exhalation rates by all 111 data were obtained to be 8.6 mBq{center_dot}m{sup -2}{center_dot}s{sup -1} and 0.80 Bq{center_dot}m{sup -2}{center_dot}s{sup -1}, respectively, and we have reported the radon and thoron exhalation rates in relation to the geological features. The relation between the exhalation rate and geology was shown that the exhalation rate had an increasing tendency in order of basic rock, neutral rock and acidic rock. We made the nationwide exhalation-rate map using the survey data of exhalation-rate of radon and thoron and the geological distribution map.

• OSTI ID: 21152435
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1034; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ALPHA DETECTION
BUILDUP
DIELECTRIC TRACK DETECTORS
DISTRIBUTION
EXHALATION
GEOLOGY
JAPAN
MAGNETISM
NATURAL RADIOACTIVITY
RADON
RADON 220
ROCKS