Abstract
1. 1. The distribution of 226Ra, Ca, Ba and Mg in the tissues of the freshwater mussel, Velesunio angasi, was studied. 2. 2. The concentration of 226Ra is significantly ( P < 0.05) and positively correlated with the concentrations of the alkaline earths, Ca, Mg and Ba, in dissected tissues of V. angasi. 3. 3. Alpha track autoradiography, electron microprobe and X-ray analysis, and histochemical studies have shown that 226Ra, Ca, Mg and Ba are co-located predominantly in granular deposits that are dispersed throughout the body of V. angam. 4. 4. The value of such a co-locational study in supporting hypotheses of analogous metabolic behaviour between the non-essential 226Ra and Ca has to be assessed in relation to the functions attributed to calcium granules. 5. 5. Granules may simultaneously accumulate 226Ra and act as a store of exchangeable Ca.
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