Radiological monitoring and assessment of the radiation situation in the Kungur Ice Cave.

This article presents the results of comprehensive radiological studies conducted in 2021 in order to assess the radiation situation in the Kungur Ice Cave (hereinafter referred to as the KIC). Since the cave is a fairly popular sightseeing object, therefore, the safety of both tourists and workers is a key task for scientific study. The radiation safety assessment was carried out taking into account the parameters of the radiation (gamma) background, measurements of radon and thoron concentrations, microclimatic indicators (air temperature, humidity), airflow rate, illumination and calculation of the indicator of a special assessment of working conditions (SAWC).

Comparative studies on radon seasonal variations in various undeground environments: Cases of abandoned Beshtaugorskiy uranium mine and Kungur Ice Cave.

It is well known that one of the most important risk factors in underground environment is the harmful effects of radon. The reasons for strong seasonal fluctuations in radon content in underground environments remain not fully understood. The purpose of this article is to improve existing ideas about this phenomenon.

Biogenic Ferrihydrite Nanoparticles: Synthesis, Properties In Vitro and In Vivo Testing and the Concentration Effect.

Biogenic ferrihydrite nanoparticles were synthesized as a result of the cultivation of microorganisms. The distribution of nanoparticles in the body of laboratory animals and the physical properties of the nanoparticles were studied. The synthesized ferrihydrite nanoparticles are superparamagnetic at room temperature, and the characteristic blocking temperature is 23-25 K.

[Surgical treatment of small aneurysms of the ascending aorta by the method of plasty and bandage].

On the basis of cardio-vascular department of the Saint Petersburg Medical academy of postdiploma education the authors made an analysis of surgical treatment of 23 patients with small (45-55 mm) aneurysms of the ascending portion of the aorta. Mean age of the patients by the time of operation was 55 years (from 35 to 75 years). The causes of the disease were as follows: poststenotic dilatation of the aorta--in 15 patients, atherosclerosis--in 5 patients, degenerative media pathology--in 3 patients.