Abstract
In the present study the activity concentration of natural radionuclides viz. 40K, 226Ra, and 232Th in the sand samples of coastal regions of Azhithala, Kerala measured using the 5″ × 5″ flat type NaI (Tl) detector. The radiological parameters such as absorbed dose rate (indoor and outdoor), annual effective dose, radium equivalent activity, and excess lifetime cancer risk were measured and compared with the Indian and World average values. The activity concentration of all natural radionuclides is well within the Indian and world average values except for the activity concentration of 232Th. The higher concentration of natural radioactivity in the study area is due to the deposition of weathered zircons or monazites from charnokite rocks. The charnokite group is the predominant lithology of the south the of Kasaragod district. The active erosion by the rivers might be the reason for the presence of the zircons or monazites in the study area. The results of the study are discussed in detail in this manuscript.
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