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In this work the role of organic matter in the potential mobility and bioavailability of 137 Cs and 60 Co in Brazilian soil was investigated. Radish was cultivated in pots containing the top layer (0–20cm) of a Histosol, Ferralsol and Nitisol spiked with 137 Cs and 60 Co. In the case of the Ferralsol and Nitisol samples, besides the control, two different rates of organic...