Disequilibrium between uranium and its progeny in the Lake Issyk-Kul system (Kyrgyzstan) under a combined effect of natural and manmade processes

Palaeoenvironment of Seam I in the Marathousa Lignite Mine, Megalopolis Basin (Southern Greece)

“…Depending on the inorganic constituents of the raw coal 40 K also contributes to the natural radioactivity of coals. Beyond the environmental aspects, the natural radionuclides' concentrations can provide a useful tool for assessing the redox conditions that prevailed during sedimentation, as well as implications concerning the sedimentation rate (Jones and Manning, 1994;Gavshin et al, 2005).…”

Uranium and its decay products in radioactive anomalies of oxidized brown coals (western part of Kansko-Achinsk brown coal basin)

“…At definition of radium the 235 U line (185.7 keV) contribution was considered. The procedure was adapted for measuring 10 cm 3 samples in the HPGe well-type detector [8,9]. Limits of detection of specified radioisotopes for 10 cm 3 sample were not worse than 3 Bq\kg at the counting time equal to 24 hours.…”

Soil-Gas Geochemistry: Significance and Application in Geological Prospectings

“…A different study of radionuclide migration was performed in the Djilubulak ephemeral stream valley on the southern shore of Issyk-Kul (Kyrgyzstan, central Asia), one of the largest and most pristine lakes in the world (Gavshin et al, 2002). The tail storages from the past mining may pose a pollution hazard to the lake water and sediments.…”

“…Soil gas results, therefore, suggest that there has not been a significant down-stream migration of radiogenic particles or elements, either via mass transport during flooding events or via groundwater movement. However, it is worth noting that in case of a catastrophic event such as an intensive flash flood, the deposits of Kadji-Sai could be eroded and distributed in the Djilubulak valley and may reach the shores of Issyk-Kul Lake (Gavshin et al, 2002). These contaminants would then produce high local levels of radioactivity in any area they reach.…”