Bioaccumulation of 95mTc in Fish and Snails

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Abstract
Concentration factors for Tc recommended in radiological assessment models for freshwater biota were default values based on the behavior of I in the environment. In this study, a small experimental freshwater pond was spiked with 95mTc to obtain data for calculating concentration factors for fish and snails. A model using the pond data was developed to calculate steady-state body burdens for freshwater biota. The concentration factors based on the calculated body burden for carp (Cyprinus carpio), mosquitofish (Gambusia affinis) and snails (Heliosoma sp.) were 11, 75 and 121, respectively. The concentration factor for carp was less than the recommended value of 15 listed in the USNRC [USA Nuclear Regulatory Commission] Regulatory Guide 1.109 for calculating radiation dose to man; the concentration factors for mosquitofish and snails exceeded the recommended values 5 and 25 times, respectively.

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