| Huang Chaoyun,Wang Haipeng,Fan Qihui.Investigation on the radioactivity level of natural rock in Lhasa[J].Chinese Journal of Radiological Medicine and Protection,2016,36(10):761-764 |
| Investigation on the radioactivity level of natural rock in Lhasa |
| Received:April 27, 2016 |
| DOI：10.3760/cma.j.issn.0254-5098.2016.10.009 |
| KeyWords:Rock Radioactivity Dose Lhasa |
| FundProject:国家科技重大专项CAP1400安全审评关键技术研究(2013ZX06002001) |
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| Abstract:: |
| Objective To investigate the radioactivity level of natural rocks in Lhasa in order to obtain the radionuclide contents and availiability of the rock. Methods Radiation monitoring and sampling were carried out in the natural rock mining area in Lhasa, and the contents of radionuclides in the samples were analyzed. Both internal and external exposure indexes were calculated, and the rocks were classified according to the relevant national standards on building materials. Results The average specific activity of 40K, 226Ra, 232Th and 238U in the rock samples were 912, 59.0, 77.1, and 64.4 Bq/kg, respectively. Internal and external exposure indexes were both less than 1. Conclusions The radioactivity level in natural rocks in Lhasa were lower than the national levels. The natural rocks could be used as main building materials and Class A decoration materials. |
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