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Radon concentration was measured in drinking water samples in some areas of Jammu & Kashmir, India, using RAD 7, an electronic solid state silicon detector. The observed values of radon concentration in some samples exceed the safe limit as recommended by the US Environmental Protection Agency (USEPA). These samples were also analyzed for concentration of certain heavy elements like As, Pb, Zn, Cu, Hg, Ni, and Cd using inductively coupled plasma atomic emission spectrometer (ICP-AES). The study was undertaken from the health hazard point of view. [ABSTRACT FROM AUTHOR]