Abstract
Measurement of natural radioactivity content as well as elemental composition in three different grain sizes (600–425 μm, 425–250 μm and 250–125 μm) of Mamallapuram beach sand, obtained from three sites, have been undertaken using gamma ray spectroscopy and SEM-EDX respectively. 238 U and 232Th activities are higher at the lowest grain size sands (250–125 μm); 40 K activity is seen, only in those samples, where 238 U and 232Th activities are comparatively lesser. In SEM-EDX analysis of the beach sand samples, fourteen elements have been identified. Besides Oxygen (39.06 %) and Silicon (24.59 %), other elements identified, which are more than 1 % are, Iron (13.46 %), Titanium (10.75 %), aluminum (5.22 %), calcium (1.46 %), magnesium (1.28 %) and Potassium (1.28 %). Six elements in trace levels have also been observed viz., Mn (0.68 %), Ni (0.38 %), V (0.36 %), Cr (0.35 %), Zn (0.35 %) and Co (0.32%).
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