FIELD: estimate of radioactive contamination of territory under examination. SUBSTANCE: plutonium is detected by sampling, burning, obtaining and analysis of ash exclusively from the internal part of vegetable material (for example, tree trunk). The presence of plutonium is determined in the obtained ash and, by the abnormal content of it in the ash, contamination of the territory or presence of underground sources of contamination by this transuranium element is judged. EFFECT: enhanced truth of determination of the presence of plutonium on the territory under examination. 4 tbl
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