The naturally occurring radionuclides present in soil, rocks, and water are not uniformly distributed all over the world, and depend primarily on geological and geographical conditions. Terrestrial gamma rays derive essentially from 40 K and the radio nuclides belong to 238 U and 232 Th series that are present in the earth's crust. Apart from these natural sources, modern scientific and technological activities also contribute to radiation levels in the environment [1-2] . . 137 Cs is regarded as the most important constituent of the worldwide radioactive fallout. In the case of an accidental release of fission products from a nuclear power plant, cesium isotopes are especially significant due to their volatility and large inventory that builds up in the reactor over time.
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Alshahri et al. (2018) studied this question.