Natural radioactivity measurements in beach sand along southern coast of Orissa,eastern India |
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| Authors: | N Sulekha Rao D Sengupta R Guin S K Saha |
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| Institution: | (1) Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, West Bengal, 721302, India;(2) Radiochemistry Division, Variable Energy Cyclotron Centre, BARC, Kolkata, West Bengal, 700 064, India; |
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| Abstract: | The beach placer deposits in the southern coastal Orissa, India may have significant levels of radiation due to the presence
of Th and U bearing minerals such as monazite and zircon. In this study, Gopalpur and Rushikulya beach regions were selected
to study the ambient radiation environment. The average activity concentrations of radioactive elements such as 232Th, 238U and 40K of beach sand samples were measured by γ-ray spectrometry using a HPGe detector, and found to be much higher than the internationally
accepted values. The cross plots of eTh/eU and eTh/K inferred that the sand samples of Gopalpur and Rushikulya beach placer
deposit were deposited in leached uranium and an oxidising environment. The absorbed γ dose rate levels of the study areas
are similar to other monazite sand-bearing HBRAs of southern and southwestern coastal regions of India and of world. Different
radiation hazard indices were estimated for the present study area and were found to be much higher than the internationally
accepted values. Hence, Gopalpur and Rushikulya beach placer region can be considered as a high background radiation area
and a potential zone for radiogenic heavy mineral exploration. |
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