BARC/PUB/08/0733

 
  226Ra, 232Th and 40K contents in soil samples from Garhwal Himalaya, India, and its radiological implications  
     
 
Author(s)

Ramnani, S. P.; Sabharwal, S.; Vinod Kumar, J.; Reddy, K. Hari Prasad ; Rama Rao, K. S.; Sai Prasad, P. S. 

ABSTRACT

The exposure of human beings to ionising radiation from natural sources is a continuing and inescapable feature of life on earth. Natural radionuclides are widely distributed in various geological formations and ecosystems such as rocks, soil groundwater and foodstuffs. In the present study, the distribution of 226Ra, 232Th and 40K was measured in soil samples collected from different lithological units of the Thauldhar and Budhakedar regions of Garhwal Himalaya, India. The collected soil samples were analysed using gamma ray spectrometry. The activity concentrations of the naturally occurring radionuclides 226Ra, 232Th and 40K in these soil samples were found to vary from below detection level (BDL) to 131±18 Bq kg−1, 9±6 to 384±53 Bq kg−1 and 471 ± 96 to 1406 ± 175 Bq kg−1, respectively. The distribution of radionuclides depends upon the rock formation and chemical properties within the earth. The activity concentrations vary widely depending on the sample origin. The external absorbed gamma dose rates due to 226Ra, 232Th and 40K were found to vary from 49 to 306 nGy h−1. The average radium equivalent activity from these soil samples was 300 Bq kg−1.

 
 
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