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A systematic study on the natural radionuclides such as ²¹⁰Po and ²¹⁰Pb in the environmental matrices of Point Calimere ecosystem has been undertaken to establish a baseline data on the radiation profile of Point Calimere environment. The environmental samples such as water, sediment and biota (seaweeds, crustaceans, molluscs and fish) have been subjected to analyses. It has been observed that the concentration of ²¹⁰Po and ²¹⁰Pb in the water samples of Point Calimere to be 0.5mBq/l and 1.3mBq/l, respectively. The soft tissues of the organisms accumulated higher ²¹⁰Po content while shells and bones contained more ²¹⁰Pb. The bivalve molluscs Meretrix casta have been identified to accumulate higher concentration of ²¹⁰Po suggesting that they could serve as bio-indicator of radionuclides like ²¹⁰Po in the Point Calimere ecosystem. The concentration factor of ²¹⁰Po for the biotic components …