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Technetium-99 was determined in samples from the 30-km zone around the Chernobyl reactor. Concentrations of 99 Tc in soil samples taken from three forest sites ranged from 1.1 to 14.1 Bq kg -1 dry weight for the organic soil layers, and from 0.13 to 0.83 Bq kg -1 dry weight for the mineral soil layers. In particular, for the organic layers, the measured 9...
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