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Twenty-one years after the Chernobyl accident, lichen and moss samples were collected from the Ordu province, which was already chosen for a related study some years ago. It was observed that 137 Cs activity concentration ranged from 31 to 469 Bq kg −1 in the moss and from 132 to 1508 Bq kg −1 in the lichen samples. The decrease of the activity concentrations in the present...
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