“…Central Tamil Nadu reported uranium concentrations of 11.78-68.28 µg/L, which was due to the dominance of lithological granitic structures like granite, quartzite, fissile hornblende, biotite, and gneiss [22,23]. The Palakkad, Thrissur, Kottayam, and Ernakulam districts of Kerala witnessed 0.5-12.54 µg/L uranium concentrations [24], whereas salem district of tamil nadu and central part of tamil nadu was reported with 0.01-385.40 µg/L and 0.4-68.28 µg/L respectively [25,26]. The Nalgonda district, Vishakaptanam, and Tummalapalle of Andhra Pradesh have been reported to have varying uranium concentrations of uranium (0.2-68.0, 0.6-12.3, and 0.38-79.70 µg/L, respectively).…”