Environmental radioactivity level at a mantle factory in eastern Zhejiang

Environmental radioactivity level at a mantle factory in eastern Zhejiang 1 first-author 1 1 1 1 Zhejiang Province Environmental Radiation Monitoring Center, Hangzhou 310012 Zhejiang Province Environmental Radiation Monitoring Center, Hangzhou 310012 The γ radiation level, alpha potential energy of thoron and alpha surface contamination level at a mantle factory in the east of Zhejiang Province are reported. The measured results show that the additional annual effective dose equivalent absorbed by the worker in some workshops of the factory was higher than 15 mSv—management limit. The alpha surface contamination on the workers' hands in some workshops was 10 times more than the management limit of National Standard (0.04Bq/cm 2 ). The mantle factory's main danger to body was internal irradiation of α rays from thoron aerosol. Mantle factory γ radiation level Alpha surface contamination Thorium Thoron Effective dose equivalent References Survey report of natural radioactivity level in Zhejiang Province (in Chinese) , Zhejiang Province Environment Monitoring Center , 1985 Survey report of natural radioactivity level in Zhejiang Province (in Chinese) Regulation for radiation protection (in Chinese), GB8703-88 UNSCEAR Sources effects of ionizing radiation, 1993 Report , New York UNSCEAR Sources effects of ionizing radiation, 1993 Report X591 2002-02-01 2003-11-01 2021-01-19 2003 Nuclear Science and Techniques 04 14