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To examine inshore radioactive contamination caused by nuclear power plants, nuclear testing, hospital and laboratory, both gross -radioactivity and -spectrometry were measured. The measurements were taken with the Abalone and Top shell, which had been collected from the four different sites at the coast in Jeju-do (Seongsan, Deajeong, Wimi, Dodu). The activity ranges of concentration were respectively 0.11-0.29 Bq/kg-wet for , 0.01-0.04 Bq/kg-wet for , 36 - 53 Bq/kg-wet for in shellfish on the Jeju island. The radioactivities of , and were similar to those in sampling location of shellfish in the coastal on the Jeju island. The radioactivity of for the Abalone was lower level than that for Top shell. The radio- activity of for the Abalone was similar to that for the Top shell. But the radioactivity of for the Abalone was higher level than that for the Top shell. As a result, the gross -radioactivity observed was similar to that in nature. Among radionuclides, only , and were detected in a very small amount, and each was also close to the natural levels.
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