The distribution pattern of radioactivc minerals in Trivandrum district of Kerala has becn investigated. Thc surface radioactivity was measured employing a jeep-mounted four-channel gamma-ray spectrometer coupled to a high volume Na I (TI) crystal detector. The distribution of radioactivity has been correlated with the corresponding litho-units and major structures of the study area. The total countrate from scdimcntarics including beach sands and pcgmatite rich zones (-3,5(10 CPS) are significantly higher than that of the latcrites and gneisses which arc substantiated by laboratory studies.

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