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| Distribution Characteristics and Induced Internal Radiation Dose of 232Th in Lhasa River, Tibet |
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Received:September 23, 2021
Revised:October 01, 2021
Accepted:October 08, 2021
Published Online:January 18, 2022
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| DOI：doi：10.3969/j.issn.1007-7545.2022.02.016 |
| KeyWord:232Th; radionuclides; internal irradiation dose; distribution characteristics; Lhasa River |
| Author | Institution |
| QIN Huan-huan |
东华理工大学 |
| CHEN Yi-ping |
东华理工大学 |
| GAO Bai |
东华理工大学 |
| SUN Zhan-xue |
东华理工大学 |
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| Abstract: |
| Contents of 232Th in water samples from 16 sampling points in the middle and lower reaches of Lhasa River and Duilongqu tributary were measured by ICP-MS, and distribution characteristics and induced internal radiation dose of 232Th in the water of the study area were obtained. The results show that content of 232Th in the water body of Lhasa River is lower than the average content of the national surface level and the drinking water standard stipulated by WHO, but higher than that of the rivers in the Yangtze River Basin and Irtysh river. 232Th content drops firstly and then rises along the middle reaches, fluctuates and changes in the downstream, decreases along the Duilongqu tributary, and rises with the increase of latitude and the decrease of longitude. 232Th has some homology with Cl- and some heterogeneity with Ca2+, Mg2+, SO42-, HCO3- and TDS, indicating that clastic rock particles around Lhasa River have transported 232Th and Cl- from the make-up water to the river under the action of high temperature, high pressure and weathering. The average cumulative dose equivalent of internal exposure caused by radionuclide 232Th ingested by residents in Lhasa River Basin is lower than the reference value recommended by WHO, indicating that the radioactivity level of Lhasa River is safe and will not cause health hazards to residents and animals drinking water from Lhasa River. |
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