Investigation of tritium content in wild plants growing in an area with an underground source of tritium.

Within the framework of the presented work, the results of large-scale studies of the content of TFWT in wild plants growing in an area with an underground source of tritium are presented. Various types of plants were studied: herbaceous, shrubby, woody. The concentration of TFWT in various vegetative organs of the same plants was analyzed separately.

Determination of the geographical coordinates of the aboveground nuclear tests epicenters.

This paper presents the determination method of the exact geographical coordinates of aboveground nuclear tests (NT) epicenters based on the radioecological study results the example of the Semipalatinsk Nuclear Test Site. By testing the NT Epicenter software for determining the exact geographic coordinates of the NT centers, it was established that it is indeed possible to determine the exact coordinates of most of the aboveground NTs. Their locations are currently determined by the presence are currently determined by the presence of technogenic disturbance of the soil surface in the area of the alleged epicenter (the presence of a crater), as well as by comparing maps of radioactive contamination and a space image.

Tritium distribution in the 'water-soil-air' system in the Semipalatinsk Test Site.

This article presents research findings on 3H in abiotic environmental compartments, specifically, the 'water-soil-air' system. All of the research areas are located within the Semipalatinsk Test Site (STS): the perimeter of the 'Degelen' site, the riverside zone of the Shagan river and the 'background' area-the southeastern part of the STS (SEP). As research progressed, numerical values of 3H and its species were revealed in various environmental compartments.

Background Level of Unstable Chromosome Aberrations in the Kazakhstan Population: A Human Biomonitoring Study.

Kazakhstan is known as a country with a complex radioecological situation resulting from different sources such as a natural radiation background, extensive activities of the industrial system of the former Soviet Union and a well-known testing of nuclear power weapons occurred in the Semipalatinsk Test Site (STS) area. The present study focuses on the assessment of the background of dicentric chromosomes in Kazakhstan's population, which is the starting point in the dose assessment of irradiated people, since the baseline level of spontaneous dicentrics can vary significantly in different populations. In this context, aiming to determine the background frequency of chromosome aberrations in the population of Kazakhstan, considering the heterogeneity of natural radiation background levels of its large territory, a selection of 40 control subjects living in four cities of North, South, West and East Kazakhstan was performed.

The transfer of 241Am and 137Cs to the tissues of broilers' organs.

Data on the transfer of artificial radionuclides from the environment to the food supply is necessary for internal dose assessment. There is a necessity for expanding and improving the available information on these factors in order to make better dose models for specific scenarios. This paper describes the results of a field experiment with broiler chickens on the transfer factor (Ff) and concentration ratio (CR) for the long-term intake of 241Am and 137Cs with grass meal and soil.

Development of a method for studying Pu/Am activity ratio in the soil of the main Semipalatinsk test site areas.

The methodology for determination of Pu in soils of the main test sites of the Semipalatinsk Test Site (STS) has been developed. The results of Am and Pu activity determination in soil samples sampled at the main testing sites of the STS are presented. Pu/Am activity ratio is calculated.