The work studied the vertical distribution of Cs-137 in the trunk of Scots pine (Pinus sylvestris L.), grown in the Bryansk region, contaminated with technogenic radionuclides as a result of the Chernobyl accident. The Cs-137 content was measured in samples of bark and wood from a 10-meter section of a model tree with a step of 10 cm using the gamma spectrometric method. The activity concentration of Cs-137 in tree bark varies from 741 to 5362 Bq kg, in wood — from 134 to 792 Bq kg. The average value transfer factors of Cs-137 from soil to tree bark was 1.9 × 10 m kg, and to wood — 0.4 × 10 m kg. It has been established that the vertical distribution of Cs-137 in the bark and wood of a tree represents harmonic oscillations with a period of 1 meter, which are described by the Fourier equation. The distribution of Cs-137 in the bark and wood of a tree has the same characteristics throughout the entire volume of the tree, regardless of its side. The period of oscillations does not correlate with the formation of annual rings and the formation of whorls, which does not exclude the relationship between the distribution of Cs-137 and self-oscillatory processes in the tree, which determine root pressure through the intake and release of water in the root cells.
Karpov et al. (Wed,) studied this question.
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