Natural Radioactivity and Associated Dose Rates in Soil Samples of Malnichera Tea Garden in Sylhet District of Bangladesh
نویسندگان
چکیده
The activ ity concentrations of naturally occurring radionuclides Ra, Th and K, were measured by using a Broad Energy Ge (BEGe) detector for soil samples collected from the Malnichara tea garden in Sylhet district of Bangladesh. The average activity concentrations of Ra, Th and K in soil samples were found to be 55.284±4.68, 125.270±5.81 and 497.91±43.83 Bqkg, respectively. The results obtained for the corresponding nuclides are slightly higher than the worldwide average values of 35, 30, and 400 Bqkg, respectively. The average outdoor absorbed dose and the annual effective dose rates due to Ra, Th and K were observed to be 124.12 ± 7.59 nGyh and 152.22±9.31 μSvy, respectively; which are above the world average. Whereas, the radium equivalent activity and external hazard indices are less than the world average values.
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