Abstract

A study of plants grown in 210PoO 2 contaminated soil indicated definite uptake through the root system. The Po concentration in the tissues varied with plant species and decreased with period of growth. Transfer coefficients ( 210Po per g dry plant/ 210Po Per g dry soil) were calculated and ranged from 3 × 10 −2 to 3 × 10 −6 for the plants grown in 210PoO 2 contaminated soil. Comparison of the natural concentrations of 210Po in plants with the data for those grown in contaminated soil confirmed that natural fallout of radon daughters is the primary source of natural 210Po in plants.

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