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Year : 2011  |  Volume : 34  |  Issue : 4  |  Page : 225-228

Study on airborne radioactivity levels in dwellings of Tumkur district, Karnataka state, India

1 Department of Physics, Government First Grade College, Sira, Affiliated to Tumkur University, Karnataka, India
2 Jnana Sahyadri, Kuvempu University Shimoga, Karnataka, India
3 Government First Grade College for Women Hassan, Karnataka, India
4 Vidya Vikas Institute of Engineering and Technology Mysore, Karnataka, India
5 P.E.S Institute of Technology and Mangement, Shimoga, Karnataka, India

Correspondence Address:
S Manjunatha
P.E.S Institute of Technology and Mangement, Shimoga, Karnataka
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-0464.106073

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Radon is a radioactive gas produced by the decay of 226 Ra present in the soil, rock, water and in atmosphere. Radon, thoron and their progeny are present in indoor and outdoor atmosphere. The concentration of these gases in indoor atmosphere is higher than that of outdoor. In the present study, the concentrations of radon, thoron and their progenies in some taluks of Tumkur district were estimated and the doses due them were calculated. Twin cup dosimeters with alpha sensitive films, LR- 115 type-2, were used for the measurement of concentrations of radionuclides. The mean indoor gamma radiation dose was found to be 0.64 mSvy−1 with highest of 0.75 mSvy−1 in Kunigal taluk. The concentrations of radon in good ventilated dwellings with granite floorings varied from 20.66 Bqm−3 in Tumkur city to 27.61 Bqm−3 in Kunigal. In poor ventilated dwellings, the concentrations of radon varied from 35.56 Bqm−3 in Tumkur to 44.87 Bqm−3 in Turuvekere. The dwellings with granite flooring showed higher concentration of radioactive gases than with marble as flooring and other floorings. The dwelling situated near the granite rocks showed higher concentrations.

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