[en] The present study deals with Committed Effective Dose (CEO) due to ²¹⁰Po through the dietary intake of seafood from the Athangarai estuary and Punnaikayal estuary. The concentration of ²¹⁰Po was determined in selected species of estuarine organisms. It is found that the ²¹⁰Po dose due to the consumption of estuarine food varied from 49.9 to 552.1 μSv/y in Athangarai estuary and 148.0 to 406.9 μSv/y in Punnaikayal estuary. Concentration of ²¹⁰Po in the muscle of edible organisms in Athangarai estuary and Punnaikayal estuary ranged from 20.8 to 181.3 Bq/kg and 88.1 to 242.2 Bq/kg respectively. Higher ²¹⁰Po dose is expected via the consumption of fish Sandinella longiceps (552.1 μSv/y) in Athangarai estuary and Thyssa malabarica (406.9 μSv/y) in Punnaikayal estuary. In the present study higher level of ²¹⁰Po concentration was observed in Plankton feeding fish of both the estuary. (author)