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

Omori, Y.  ,  Tokonami, S.  ,  Sahoo, S.K.  ,  Ishikawa, T.  ,  Sorimachi, A.  ,  Hosoda, M.  ,  Kudo, H.  ,  Pornnumpa, C.  ,  K. Nair, R.  ,  Jayalekshmi, P.A.  ,  Sebastian, P.  ,  Akiba, S.

37 ( 1 )  , pp.111 - 126 , 2017-01 , IOP Science
ISSN:0952-4746
Description
In order to evaluate internal exposure to radon and thoron, concentrationsfor radon, thoron, and thoron progeny were measured for 259 dwellingslocated in high background radiation areas (HBRAs, outdoor external dose:3–5 mGy y−1) and low background radiation areas (control areas, outdoorexternal dose: 1 mGy y−1) in Karunagappally Taluk, Kerala, India. Themeasurements were conducted using passive-type radon-thoron detectors andthoron progeny detectors over two six-month measurement periods from June2010 to June 2011. The results showed no major differences in radon andthoron progeny concentrations between the HBRAs and the control areas. Thegeometric mean of the annual effective dose due to radon and thoron wascalculated as 0.10 and 0.44 mSv, respectively. The doses were small, but notnegligible compared with the external dose in the two areas.

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