干旱区生态环境知识资源中心

At present paper the results of chemical and radiochemical analysis of the environmental samples collected from the Shu river valley, are shown. The samples were collected along the Shu river from Tokmak town to Shu town during the field expedition, conducted in October, 2008, and in July, 2009.

The main ions and uranium decay radionuclides in water increase up to maximum concentration in Tasotkel reservoir. The biogenic elements analysis showed their typical concentration for arid zone. The water contaminations with compounds of phosphorus, silicon, ammonium and nitrate ions are also shown. The activity of uranium isotopes is lower than the values corresponding to the "The norms of radiation safety" series [1]. The uranium concentration values are changing from 7.9 to 39.2 mu g l(-1) (Tasotkel reservoir) along the Shu river. This is in 2.5 times higher than the WHO level (15 mu g l(-1)) [2]. The concentrations of uranium decay radionuclides are lower than the normative levels, corresponded by "The norms of radiation safety" series. The calculated value of effective doses, received from drinking water are near limited levels. The uranium isotopes is the main dose source.

For chemical characterization of soils and sediments RFA and for mineral composition of soils and sediments the RPA respectively were done. The main mineral determined by above methods is quartz, spars, mica, tiff and peach. The levels of uranium and thorium determined in the soil samples are high. The increased levels of uranium and thorium are the result of regional specialization of the ores, containing the radioactive elements. The concentrations of determined isotopes in soils are higher than the concentrations in the sediments owing to the presence of organogenic component in them.