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The main aim of the study is to present an assessment report of radon concentration in the underground water of Bokaro district, Jharkhand, India. Water samples were collected from tube-wells at 100 different locations scattered throughout the district. The radon (²²²Rn) concentration level varies widely between 3.5 and 598.9 Bq/l with an average value of 145.8 Bq/l. In this paper, total annual effective dose of the samples and associated excess lifetime cancer risk (ELCR) were estimated also to assess the health risk due to the consumption of the radon rich water.