Analysis reveals significant variation in activity of 137Cs, 90Sr, and plutonium isotopes in soil samples, suggesting effective sampling strategies are essential.
The problems of reliable determination of activity of 137Cs, 90Sr, 239,240Pu and activity ratio 137Cs/90Sr in the soil samples containing the hot particles are considered. It is shown that the soil samples have volumetric heterogeneity of contamination, which can not be eliminated by their homogenization. Distribution of the possible values of the sample specific activity is described by the lognormal regularity. It is proposed the method for calculation of a minimal necessary number of the soil samples for the estimation of median of the measured value at the fixed relative uncertainty.
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Yu.V. Khomutinin (2003) studied this question.
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