Activity of 137Cs and 40K Isotopes in Pine (Pinus sylvestris L.) and Birch (Betula pendula Roth) Stands of Different Ages in a Selected Area of Eastern Poland

Abstract

Research Highlights: a forest is an ecosystem that allows for the assessment of radioactive contamination of the environment over several decades. (1) Background and Objectives: measurements of the activity of the 137Cs isotope in various elements of a forest ecosystem are one of the most important parameters in the assessment of radioisotope contamination. The translocation of 137Cs in the environment is determined by the activity of the natural 40K isotope in soil. The activities of 137Cs and 40K isotopes were assessed in two stands of Betula pendula and Pinus sylvestris, differing in age (30, 50, and 80 years old); (2) Materials and Methods: the research was conducted in one of the forest districts of eastern Poland. Wood, litter, and soil were collected for the tests from the sampling sites. The activity of 137Cs and 40K was determined using the γ-spectrometric method. Based on the activity of these isotopes in wood and soil, the values of translocation factors (TF) were determined; (3) Results: the highest activity of 137Cs was recorded in the wood of the oldest stands, the growth period of which coincided with the time period of intensive testing with nuclear weapons. With the growing age of the stand, the value of TF 137Cs increased, while the value of TF 40K was not dependent on the age of the stands. Birch wood accumulated more 137Cs and 40K isotopes than pine wood. (4) Conclusions: the results show a much greater radioactive contamination of the environment in eastern Poland during the testing with nuclear weapons than after the Chernobyl nuclear reactor explosion. The greater accumulation of radiocesium in birch wood than in pine wood predisposes this species to be more useful when assessing the radioactive contamination of the environment from the past.

Correlation between Element and Radionuclide Activity Concentrations in Soil and Beech Forests Growth Potential

“…Chemical reactions that take place in the pedosphere in the process of soil formation determine the mobilization and redistribution of elements in the soil profile, so there is a significant correlation between the total content of elements in the soil and the parent substrate [10,11]. Besides chemical elements being natural constituents of rocks and soils [12,13], natural radionuclides in soil or soil solutions continuously participate in biogeochemical processes [14][15][16][17][18].…”

Circulation of 137Cs in Various Forest Plants in the Chornobyl Exclusion Zone during the Year

“…When radionuclides are released into the environment, the forest ecosystems are inevitably polluted. Close attention was paid to the study of the patterns of accumulation of various radionuclides (including 137 Cs) in forest ecosystems in general and in individual forest objects in particular (wood, moss, soil, fungi and others) [23][24][25][26][27][28][29][30][31][32][33].…”