Inhalation Dose and Source Term Studies in a Tribal Area of Wayanad, Kerala, IndiaReport as inadecuate

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Journal of Environmental and Public Health - Volume 2017 2017, Article ID 1930787, 10 pages -

Research Article

Government Medical College, Kozhikode, Kerala, India

Department of Physics, University of Calicut, Malappuram, Kerala, India

Department of Physics, Fatima Matha National College, Kollam, India

Radiological Safety Division, Indira Gandhi Center for Atomic Research, Kalpakkam, India

Environmental Assessment Division, Bhabha Atomic Research Center, Mumbai, India

Correspondence should be addressed to Reshma Bhaskaran

Received 20 December 2016; Revised 26 March 2017; Accepted 30 April 2017; Published 22 May 2017

Academic Editor: Jong-Tae Lee

Copyright © 2017 Reshma Bhaskaran et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Among radiation exposure pathways to human beings, inhalation dose is the most prominent one. Radon, thoron, and their progeny contribute more than 50 per cent to the annual effective dose due to natural radioactivity. South west coast of India is classified as a High Natural Background Radioactivity Area and large scale data on natural radioactivity and dosimetry are available from these coastal regions including the Neendakara-Chavara belt in the south of Kerala. However, similar studies and reports from the northern part of Kerala are scarce. The present study involves the data collection and analysis of radon, thoron, and progeny concentration in the Wayanad district of Kerala. The radon concentration was found to be within a range of 12–378 Bq-m

. The thoron concentration varied from 15 to 621 Bq-m

. Progeny concentration of radon and thoron and the diurnal variation of radon were also studied. In order to assess source term, wall and floor exhalation studies have been done for the houses showing elevated concentration of radon and thoron. The average values of radon, thoron, and their progeny are found to be above the Indian average as well as the average values reported from the High Natural Background Radioactivity Areas of Kerala. Exhalation studies of the soil samples collected from the vicinity of the houses show that radon mass exhalation rate varied from below detectable limit BDL to a maximum of 80 mBq-kg-h. The thoron surface exhalation rate ranged from BDL to 17470 Bq-m





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