期刊
JOURNAL OF RADIOLOGICAL PROTECTION
卷 37, 期 1, 页码 111-126出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6498/37/1/111
关键词
high background radiation area; inhalation; internal exposure; radon; thoron
类别
资金
- Ministry of the Environment in Japan
In order to evaluate internal exposure to radon and thoron, concentrations for radon, thoron, and thoron progeny were measured for 259 dwellings located in high background radiation areas (HBRAs, outdoor external dose: 3-5 mGy y(-1)) and low background radiation areas (control areas, outdoor external dose: 1 mGy y(-1)) in Karunagappally Taluk, Kerala, India. The measurements were conducted using passive-type radon-thoron detectors and thoron progeny detectors over two six-month measurement periods from June 2010 to June 2011. The results showed no major differences in radon and thoron progeny concentrations between the HBRAs and the control areas. The geometric mean of the annual effective dose due to radon and thoron was calculated as 0.10 and 0.44 mSv, respectively. The doses were small, but not negligible compared with the external dose in the two areas.
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