Environmental radioactivity level at a mantle factory in eastern Zhejiang

The γ radiation level, alpha potential energy of thoron and alpha surface contamination level at amantle factory in the east of Zhejiang Province are reported. The measured results show that the additional annual ef-fective dose equivalent absorbed by the worker in some workshops of the factory was higher than 15mSv-management limit. The alpha surface contamination on the workers' hands in some workshops was 10 timesmore than the management limit of National Standard (0.04 Bq/cm2). The mantle factory's main danger to body wasinternal irradiation of α rays from thoron aerosol.

作 者： YE Ji-Da ZENG Guang-Jian WU Zong-mei Liu Hong-shi NI Shi-Ying   作者單位： Zhejiang Province Environmental Radiation Monitoring Center, Hangzhou 310012  刊 名： 核技術(英文版)  SCI 英文刊名： NUCLEAR SCIENCE AND TECHNIQUES  年，卷(期)： 2003 14(4)  分類號： X591  關鍵詞： Mantle factory   γ radiation level   Alpha surface contamination   Thorium   Thoron   Effective doseequivalent  

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