Geochemical and Isotope Anomalies in Sioma River Gorge, Western Tajikistan

Radiation

Djamshed A. Abdushukurov¹  Daler Abdusamadzoda¹  Marina V. Frontasyeva²  Octavian G. Duliu² 

[1] Institute of Water Problem, Hydropower Engineering and Ecology 12, Parvin Str., Dushanbe 734063, Tajikistan;Joint Institute for Nuclear Research, 6, Joliot Curie Str., 141980 Dubna, Russia;

关键词: Sioma River;    Tajikistan;    natural radioactive elements;    radiocesium;    pegmatite;    gamma-ray spectrometry;   

DOI  :  10.3390/radiation1020013

来源: DOAJ

【 摘 要 】

For a better understanding of the previously observed increased natural radioactivity at the confluence of the Varzob and Sioma rivers, Central Tajikistan, the activity concentration of natural radioactive ${}^{40}$K, Th and U daughters as well as of the anthropogenic ${}^{137}$Cs were determined in nine locations covering the entire Sioma River. The radiometric determinations evidenced, in addition to increased activity concentrations of Th and U daughter radionuclides, an anomalous accumulation of anthropic ${}^{137}$Cs and natural ${}^{210}$Pb in the middle of the Sioma gorge. Complementarily, the mass fractions of natural Th and U determined by instrumental neutron activation analysis evidenced an increased presence of Th and U, which, in some places, overpasses six-times the average mass fraction found in the upper continental crust. The possible influence of active air transport from the southern Tadjik plane during the Afghani storms, as well as the presence of actinide-rich minerals, were analyzed and discussed.

【 授权许可】

Unknown