Radiation dose due to radon and thoron progeny inhalation in high-level natural radiation areas of Kerala, India. (21st December 2016)

• Record Type: Journal Article
• 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
• Is Part Of: Journal of radiological protection. Volume 37:Number 1(2017:Mar.)
• Page Start: 111
• Page End: 126
• Publication Date: 2016-12-21
• Subjects: high background radiation area -- inhalation -- internal exposure -- radon -- thoron; Radiation -- Safety measures -- Periodicals; Health Physics -- Periodicals; Radiation Monitoring -- Periodicals; Radiation Protection -- Periodicals; Rayonnement -- Sécurité -- Mesures -- Périodiques; Electronic journals; Fulltext; Internet Resource; Periodical; 363.179905
• DOI: 10.1088/1361-6498/37/1/111
• Languages: English
• ISSNs: 0952-4746

Abstract

Abstract: 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.