Relevance. Both Russian and foreign researchers pay attention to the mental disorders in people with a history of accidental radiation exposure. A wide range of mental pathologies have been observed among the Chernobyl NPP clean-up workers, victims of the accident at the Fukushima Daiichi NPP, etc.Intention – To assess primary incidence of mental disorders and behavioral disorders in residents of the municipal areas of the Chelyabinsk region affected by radioactive contamination.Methodology. Primary incidence rates of mental disorders and behavioral disorders (F00–09, F20–99 ICD-10) were assessed for the period from 2005 to 2018 in residents of municipal areas of the Chelyabinsk regions (Kunashaksky, Krasnoarmeysky, Argayashsky, Kaslinsky, Sosnovsky districts) affected by radioactive contamination in 1949–1951 and 1957 as a result of the activities of the “Mayak” production association. These data were compared to that from non-contaminated Etkulsky district with similar population and economic activity. Mental disorders were classified according to the groups of the chapter V “Mental and behavioral disorders” of the International Classification of Diseases of the 10th revision (ICD-10). Incidence was calculated per 10 thousand population (0/000). Descriptive analysis of the registered primary incidence of mental disorders in residents of these districts of the Chelyabinsk region is presented.Results and discussion. The primary incidence rate of mental disorders in the Chelyabinsk region (49.1 ± 3.6) 0/000 significantly (p < 0.001) exceeds those in the Sverdlovsk (30.3 ± 4.2), Kurgan (30.2 ± 6.9) 0/000 regions and overall estimates for the Russian Federation (32.9 ± 3.8) 0/000 . In the remote period, primary incidence rates of mental disorders in the residents of some radioactively contaminated districts were higher vs Etkulsky district, but significantly lower than overall rates in the Chelyabinsk region (p < 0.001). Taking into account the territorial distribution of the exposed residents and their offspring in the Chelyabinsk region, mental retardation in residents of the Kunashak district should be closely monitored.Conclusion. Mental morbidity in areas accidentally contaminated more than 70 years ago now reflects the general trend of deterioration in the mental health of the population of the Chelyabinsk region. It can be assumed that the incidence of mental disorders in the population of the Chelyabinsk region is determined by a constellation of interacting factors (socio-economic, personal-psychological, radiation, informational and others), among which socially determined mechanisms of the mental pathology prevail.

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Purpose: To study late mental and behavioral disorders (ICD-10) in individuals who were accidentally exposed in the Southern Urals. Material and methods: The research subjects are the persons who were exposed to radiation as a result of dumping of radioactive waste into the Techa River (1949–1956), who were born before 1953 and lived in the Techa River basin between 1950 and 1960. The study group consists of 425 people, women predominate (72.5 %), people with secondary special education make up 44.5 %, and pensioners amount to 89.4 %. Mean age at examination was 67.3 ± 5.3 years. Information on radiation doses included data on the absorbed dose to the stomach, which was considered as an analog of brain exposure (50 ± 3 mGy). The paper uses clinical-anamnestic, clinical-psychopathological, clinical and instrumental methods. Results: It has been demonstrated that in the long-term period, accidentally exposed individuals have organic nonpsychotic mental disorders (72.2 %), with the predominance of organic asthenic (29.6 %) and organic cognitive (36.5 %) disorders. Among the studied individuals, only 20.9 % showed no signs of mental illness. Higher absorbed doses to the stomach (70 ± 8 mGy, p = 0.01) was determined in patients with organic cognitive disorder. Concomitant somatic pathology is present in patients with organic cognitive disorder — hypertension (90.3 %, p = 0.005), ischemic heart disease (56.7, p = 0.004), chronic brain ischemia (43.2 %, p = 0.04). Patients with organic asthenic disorder may have hypertension (94.4 %, p = 0.0002), ischemic heart disease (51.6 %, p = 0.04), chronic brain ischemia (35.7 %, p = 0.02). In the group of patients without mental pathology, the most common were hypertension (76.4 %), diseases of the musculoskeletal system (61.7 %, p = 0.03), and ischemic heart disease (37.1 %). Multiple correlation analysis showed a weak statistically significant association of organic mental disorders with chronic brain ischemia, hypertension, ischemic heart disease and the age of patients. Conclusion: The performed study complements the current understanding of long-term mental disorders in exposed individuals, and requires further research to study the pathogenesis of cerebrovascular and cardiovascular diseases in individuals exposed to radiation.

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