Abstract

The comparative uptake by maize ( Zea mays L.) and bean ( Phaseolus vulgaris L.) plants of gamma-emitting activation products 59Fe, 58Co, 54Mn and 65Zn, which may be released in controlled or accidental discharges from nuclear installations, was examined in nutrient culture experiments. The accumulation in aerial tissues of 65Zn and 54Mn was greater than that of 58Co and 59Fe for identical plant growth periods. The distribution of 59Fe, 58Co and 65Zn in the organs of bean plants was generally uniform whereas the distribution of 54Mn was markedly acropetal in amount. Chemical fractionation of these activation products accumulated in the edible bean pods indicated substantial distribution of 59Fe, 58Co and 65Zn in the lipids, including lipophyllic pigments, free amino acids and amino sugars (ethanol) fraction) and also with ionic forms, including salts of organic acids, phosphates, carbonates and some protein bound forms extracted with weak mineral acids (acid fraction); the 54Mn was present only in the acid fraction.

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