The present paper discusses the systematic study on gamma dose rate, radon exhalation, radium content in soil and sediment and radon concentration in water of Hemavathi River environments. The Gamma dose rate in the air in the study area varied from 98 to 202 nGy h−1 with mean value 145 nGy h−1. The measured dose rate was above the world and Indian average. The mean value of radium activity in soil and sediment was found to be 366.61 and 328.36 mBq kg−1, respectively. The mean value of radon in soil and sediment was found to be 373.90 and 334.90 Bq m−3, respectively. The radon concentration of water ranges from 0.20 to 1.60 kBq m−3 with an average value of 0.67 kBq m−3. The radon in water contributes to dosage in stomach and lungs. The effective doses of radon were calculated and compared with international recommended values. The results show that sediment and water are safe to use for construction and drinking purpose.
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