Abstract
Contrary to recent reports (e.g., see reference (1)) on the effects of radioactivity on various heterogeneous chemical processes, barium sulphate labelled with 35S having specific activities of 5, 20 and 50 mc/g showed constant solubility of 1·15 × 10 −5 mole/l. in water at 25°C. Calcium sulphate, labelled with 45Ca having specific activities of 0·1, 0·2, 0·5 and 1·0 mc/g showed constant solubility of 0·0151 mole/l. However, silver iodate, labelled with 110Ag, behaved as though the radioactivity induces breakup of the crystal surface into particles too small for ordinary filtration, and the effect seems to depend on specific activity in the range 0·04–6·0 mc/g.
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