Radiation dose due to radon and thoron progeny inhalation in high-level natural radiation areas of Kerala, India

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...

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Bibliographic Details
Published in:Journal of radiological protection 2017-03, Vol.37 (1), p.111-126
Main Authors: Omori, Yasutaka, Tokonami, Shinji, Sahoo, Sarata Kumar, Ishikawa, Tetsuo, Sorimachi, Atsuyuki, Hosoda, Masahiro, Kudo, Hiromi, Pornnumpa, Chanis, Nair, Raghu Ram K, Jayalekshmi, Padmavaty Amma, Sebastian, Paul, Akiba, Suminori
Format: Article
Language:English
Subjects:
Air Pollutants, Radioactive - analysis
Air Pollution, Indoor - analysis
Background Radiation
Carcinogens, Environmental - analysis
Environmental Exposure - analysis
high background radiation area
Housing
Humans
India
inhalation
internal exposure
Radiation Monitoring - methods
radon
Radon - analysis
Radon Daughters - analysis
thoron
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Summary: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.
ISSN:0952-4746
1361-6498
DOI:10.1088/1361-6498/37/1/111