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A coloured rain event originating from the Sahara Desert occurred on April 9, 2000 at Thessaloniki, Northern Greece (40 o 38'N, 22 o 58'E). The radioactive nuclides that were determined in a coloured rain dust sample were 137 Cs of Chernobyl origin, 7 Be of cosmogenic origin and 40 K of terrestrial origin. Cesium-137 still remained 14 years after...
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