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The activity of 137Cs and 40K in forest soils and wastelands in the vicinity of Siedlce (eastern Poland) were measured. The soil samples were collected on depths of 0-4 cm, 4-8 cm and 8-12 cm. The average specific radioactivity of 137Cs in forest soils and wastelands were 57 Bq/kg and 15 Bq/kg, respectively. The highest specific radioactivity of 137Cs was observed in superficial layers of forest soils...
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