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| γ Dose Rate Level in Terrestrial Field Environment from 1995 to 2008 |
| HU Xiao-yan, LIU Hong-shi, XIANG Yuan-yi, LU Yue-ping, HE Bi-sheng, ZHOU Yan |
| Zhejiang Provincial Radiation Environment Monitoring Center, Hangzhou 310012 China |
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Abstract Objective To further understand the level and the distribution of the natural γ radiation dose rate in terrestrial field environment in China. Methods Collect the γ dose rate data from published books, journals and bulletins, then check, analyz, and rearrange these data to summarize the γ radiation dose rate level in terrestrial field environment of 30 provinces, autonomous regions and municipalities from 1995 to 2008. Results The instantaneous γ dose rate in terrestrial field environment in 30 provinces from 1995 to 2008 is in the range of 46.3~98.1 nGy/h, the arithmetic mean value is about 62.3 nGy/h. The γ radiation dose rate level in south of the Yangtze fields(63.9 nGy/h) is slightly larger than the north of the Yangtze(60.6 nGy/h). According to the environmental instantaneous γ radiation level, except slightly higher in the South China region, in the north, east, central, southwest and northwest areas it is at the same level. Conclusion In China, the instantaneous γ radiation dose rate of terrestrial field environment from 1995 to 2008 is close to the background value during 1983 to 1990(62.8 nGy/h), and there is no significant change by years. The γ radiation dose rate of each region/province are at the same level.
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Received: 07 June 2012
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