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.

Goal. To reveal the peculiarities of central hemodynamics of cadets of a marine university in the conditions of a five-month sailing.Materials and methods. A survey of 70 cadets on board of a sailing training vessel was carried out in the dynamics of a five-month voyage (165 days). Hemodynamic indicators were monitored before entry on duty. For the statistical processing of the results, the SPSS software, v 17.0 (IBM) was used.Results and its discussion. The first two months are characterized by stable indicators of myocardial contractile function, which begins to change from the third month. In the third month, signs of mobilization of the circulatory function appear, which is expressed in an increase in blood pressure (p<0.05) and blood pressure (p<0,05) (by 6.6% and 14%, respectively).The fourth and fifth months are characterized by a further activation of the compensatory-adaptive mechanisms of hemodynamics: an increase in blood pressure (p<0,05), blood pressure (p<0,001), as well as MVC (p<0,05) due to an increase in heart rate (p<0,001), which indirectly indicates a decrease in efficiency in the work of the cardiovascular system.

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.

This paper analyses the results of a correlation analysis of haemodynamic parameters in 38 male skiers with the ranks of First- and Second-Class Sportsman aged between 18 and 22 years. Stroke volume, heart rate, cardiac output, myocardial efficiency index, myocardial stress index, left ventricular power index, and total peripheral resistance were determined 4 times a year (autumn, winter, spring and summer). It was found that not only the haemodynamic parameters, but also the connections between them change during the year. For instance, in skiers with sports ranks, stroke volume prevails in the structure of cardiac output, especially in autumn and winter, which indicates a significant chronotropic reserve of the cardiovascular system. Myocardial efficiency index is provided by the value of stroke volume. A correlation between myocardial efficiency index and left ventricular power index in skiers can be observed in autumn and, especially, in winter. The value of total peripheral resistance negatively affects cardiac output, stroke volume, myocardial stress index, heart rate, and left ventricular power index.

The article briefly describes the results of calculations of probable potential accidents (emergencies) at a technical facility designed for storing diesel fuel at a tank battery and their consequences for humans and the environment. The calculations considered the most important parameters: the amount and hazard class of substances, the volume, and area of industrial premises, temperature and pressure fluctuations, the distance of personnel from the damaging factor, etc. It was revealed that such types of accidents as an explosion of a fuel-air mixture, a pool fire, jet fire, an explosion inside equipment, an explosion inside a building are possible at this enterprise. As a result of calculations, it has been established that the most likely accident will occur in case of partial depressurization of the pipeline and the formation of the pool fire, the number of the forecasted casualties is 1 person.