Distribution of 137Cs activity concentration in wood scots pine (Pinus sylvestris L.) of Zhytomyr Polissya after the Chernobyl accident

Using the calculated values for wood samples (relative diameter, height and relative activity concentration of 137Cs) selected in different parts of the profile tree stems, statistical and graphical interpretation of the regularity of the distribution of 137Cs in the wood of model trees of Scots pine were performed. In the research, detected observation uniformity of samples in the studied profiles stems for the relative activity concentration of 137Cs, calculated on the base of the ratio of the activity concentration of tree rings for certain years to their median at height of 1.3 m. Three intervals of the relative diameters for stem wood of model trees at height of 1.3 m of the study stand were obtained, that is characterized by significant difference on the activity concentration of 137Cs: d(ω)1.3m ≤ 0.55 (Am(ω) = 0.63 ± 0.08); 0.55 < d(ω)1.3m ≤ 0.95 (Am(ω) = 1.01 ± 0.04); 0.95 < d(ω)1.3m ≤ 1.0 (Am(ω) = 2.1 ± 0.5)