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The plutonium activities ( 238 Pu and  239,240 Pu) of soil samples from the village of Dolon, located close to the Semipalatinsk Nuclear Test Site in Kazakhstan, were measured and compared with the  90 Sr and  137 Cs activities. Depth profiles of  239,240 Pu were determined for four of the nine sampling sites. The  239,240 Pu areal deposition at the nine sites is in the range of 140 to 9700 Bq m -2 . For all samples, the  239,240 Pu yield after destruction of the soil matrix is significantly higher than after extracting with 8 M HNO 3  indicating that  239,240 Pu originates mainly from local fallout. The fraction of  239,240 Pu not leached with 8 M HNO 3  is assumed to be associated with fused silicates.

Plutonium in soil from Dolon near the Semipalatinsk nuclear test site