Aim: To assess background radiation levels in the area adjacent to a mining and processing plant in a Russian Arctic setting. Methods: An equivalent dose rate in μSv / h at an altitude of about 1 m as well as a flux density of alpha and beta radiation from the surface of water, rocks and soil were estimated. The MKS-01A Multirad-M portable spectrometry complex was used for the route radiometric survey to measure the dose rate of gamma radiation and the content of natural radionuclides in soil. Radon level measurements were carried out using an PAA-10 and IZV-3M radiometer aerosols. Result: Soil radioactivity in the swamp tundra varied from 7.03 to 71.06 Bq/kg while in the mountain tundra the corresponding values were from 15.17 to 27.75 Bq/kg. The radiation intensity of the Khibiny surface sediments ranged from 0.12 (soils of wetlands and lowlands) to 0.45 (bedrock, precipitation-scree deposits) μSv/h. On the territory of quarries and industrial sites, as well as in the mountains used for recreational purposes, the background radiation was from 0.21-60.0 μSv/h. Air radioactivity in the basements of buildings was from 17.3 to 57.6 Bq/m3. Conclusions. Our results suggest that the territories of quarries and other industrial sites, as well as mountain areas used for recreational purposes can be classified as areas for persons of category B meaning that a limited part of the population may be exposed to radiation. This does not raise concerns because of limited duration of stay of people in these areas which is is much shorter than the permissible exposure time for these conditions regulated by URB. The radon content and the assessment of the activity of the daughter products of its decay in the basements suggest that the average concentrations do not exceed the limit of 200 Bq/m3. The radiation environment of the study area can be considered as relatively safe.

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The effects of the watch system of job management on central hemodynamic parameters and the constant potential of the brain were studied in sailors during a long voyage. Twenty crew members were examined during a 120-day translatitudinal voyage. The studies were performed on days 4-6, 40-42, 73-75, and 107-109 of the voyage. It was found that the role of the peripheral regulatory loop in maintaining physiological functions increases during the second half of the voyage and that the functional activity before a watch determines the changes in the parameters by the end of the watch. For each stage of the study, the baseline value of the constant potential of the brain is an important element of functional activity. The system of ratios between parameters before and after a watch that is formed in the early period of the voyage breaks up during the second month, the general reactivity of the body after a watch being independent of the reactivity before the watch; the reactivity is stochastic and is mainly controlled by central mechanisms. In the second month of the voyage, the first signs of a strategy aimed at making the functioning more economical are observed in crew members. The second and third months of the voyage are characterized by a considerable strain of the mechanisms of adaptation, activity, and reactivity in sailors. During the third month of the voyage, overfatigue develops.

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The effect of the experimental physical education program (twice a week) on the maximum oxygen consumption (MOC), blood lipid composition and motor tests of technical university students have been studied. The research was carried out four times during the academic year (in September, December, February and May). It was established that MOC significantly increased at all stages of the experiment, reaching its maximum in the spring term. The concentration of high density lipoproteins (HDL) statistically significantly increased in the fall and spring terms. The level of low density lipoproteins (LDL) decreased significantly throughout the research period. The level of total cholesterol (TC) decreased significantly in the spring term (by 9%). It can be concluded that training twice a week is effective for the development of aerobic performance and changing the lipid composition of the blood.