Iodine in soils, pasture vegetation cuttings, and local food products of certain regions of Russia affected by the Chernobyl nuclear power plant accident

Natural iodine deficiency, which in some regions of Russia provokes thyroid diseases, increases the consequences of the entry of short-lived radioactive isotopes of this element into the food chain as a result of the Chernobyl accident (1986). The aim of the work is to assess the risk of morbidity of the population of the Kaluga, Bryansk and Oryol regions with thyroid cancer at the level of individual settlements based on experimental data. The iodine content in soils and vegetation cuttings of pastures in geochemically contrasting landscapes, as well as in cows' milk and potatoes of private household farms in the regions affected by the Chernobyl accident in 1986: Bryansk (2021), Oryol (2022) and Kaluga (2023) regions was studied. Joint expeditions of the Laboratory of Environmental Biogeochemistry of GEOKHI RAS and the Department of Human Ecology and Bioelementology of the Institute of Ecology of RUDN, carried out on the initiative and with the participation of the authors, revealed a significant variation of iodine concentration in soils and food products, which may be crucial for assessing the risk of thyroid diseases, including thyroid cancer, among the local rural population. The iodine content was found to be highly variable in both topsoil (0.31-3.04 mg/kg) and grass cuttings (0.14-0.29 mg/kg) of the study area. The maximum natural and technogenic risk of thyroid cancer morbidity in the rural population as a result of the consequences of the Chernobyl accident of 1986 is specific for the studied settlements of Zhizdrinsky district of Kaluga region, Bolkhovsky, Dmitrovsky and Sverdlovsky districts of Oryol region, Rognedinsky district of Bryansk region.