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Radiation Protection Dosimetry Advance Access originally published online on August 4, 2008
Radiation Protection Dosimetry 2008 131(4):495-502; doi:10.1093/rpd/ncn203
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Study on radionuclides in granite quarries of Bangalore rural district, Karnataka, India

C. Ningappa1, J. Sannappa2,* and N. Karunakara3

1 Vidya Vikas Institute of Engineering and Technology, Mysore-570 010, Karnataka, India
2 Yuvaraja's college, University of Mysore, Mysore-570 005, Karnataka, India
3 USIC, Mangalore University, Mangalore, Karnataka, India

* Corresponding author: sannappaj{at}yahoo.co.in

Received November 3, 2007, amended July 3, 2008, accepted July 13, 2008

Studies on natural radiation levels and radionuclides were carried out extensively in the environment of granite quarries of Kanakapura, Ramanagara Taluks and Bidadi Hobli in Bangalore rural District and Bangalore city. The indoor and outdoor gamma exposure rate in air was measured using an environmental dosemeter, and it is converted into absorbed dose using suitable conversion factor. The activity concentrations of natural radionuclides in rock samples and also in soil samples were measured using an HPGe gamma-ray spectrometer. The results reveal that the activity concentrations of 226Ra, 232Th and 40K in rocks are found to be vary from 32.2 to 163.6, 128.3 to 548.6 and 757.4 to 1418.4 Bq kg–1, respectively, with corresponding arithmetic mean values of 93.2, 306.2 and 1074.4 Bq kg–1. Activity concentrations of 226Ra, 232Th and 40K in soil samples were found to vary from 32.4 to 55.2, 39.9 to 214.3 and 485.4 to 1150.2 Bq kg–1, respectively, with corresponding arithmetic mean values of 40.7, 93.1 and 750.4 Bq kg–1. The average activity levels of all these radionuclides are above the global average. This is consistent with the geological and geo-chemical significance of the rocks of the area under investigation. The results of these systematic investigations are discussed in detail and compared with the literature values represented for other environments.


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