Abstract
Abstract Technetium accumulation from seawater by the abalone Haliotis rufescens was studied with 95Tc. Concentration factors, uptake rates, steady state concentrations, and biological half lives were determined experimentally for whole-body uptake. Whole-body concentration factors ranged from 135 to 205; biological half life was 60 days. Changes in concentration factors were determined for six tissues during the uptake period. The highest activities were in the order of: digestive gland > gill > kidneys > heart > gonad > columnar muscle. Dead shells accumulated little activity compared to shells of living abalone. Gills and digestive system appear to be the routes of entry. Autoradiography shows that of the muscular tissues the outer edge of the foot and epipodium are the most active and the edible columnar muscle the least active.
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