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Cauvery, one of the major rivers, passes through three states, namely Karnataka, Tamil Nadu, and Kerala. This river is crucial for drinking water, irrigation, and electricity. In India, river sand is a key component of building construction. Through a gamma ray spectrometer with a NaI doped with a thallium detector, the natural radioactive elements such as uranium, thorium, and potassium (238U, 232Th, 40K) are explored and analyzed. As per the report of the United States Department of Agriculture (USDA) sediment and sand grain size is divided into several types, which include gravel medium...