Abstract
The distribution of natural radioactivity in beach sand samples collected from naturally high background radiation areas of south west coast of Tamil Nadu in India is studied by gamma spectrometry. The activity concentration of radionuclide collected from the study area ranges from 18.9 ± 4.6 Bq/kg to 260.5 ± 29.4 Bq/kg for 226 Ra, 534.5 ± 34.0 Bq/kg to 2961.4 ± 33.7 Bq/kg for 232 Th, and 40.6 ± 7.2 Bq/kg to 148.7 ± 17.9 Bq/kg for 40 K. The measured activity of 226 Ra and 232 Th in soil samples collected from the study area is higher than the activity of 40 K. The external hazard index, internal hazard index, absorbed dose rate, and annual effective dose equivalent are calculated and tabulated. It is found that all the evaluated values are higher than the safe limit. The annual effective dose of radiation ranges from 0.41 mSv to 2.35 mSv due to naturally occurring radionuclide.
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