Wang N, Peng A, Xiao L, Chu X, Yin Y, Qin C, Zheng L
School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China.
Radiat Prot Dosimetry. 2012 Nov;152(1-3):204-9. doi: 10.1093/rpd/ncs223. Epub 2012 Aug 23.
In order to understand the level and distribution of (220)Rn concentrations in soil-gas in the high-radiation-background area, an (220)Rn survey was carried out for the first time using a RAD7 portable radon monitor at 67 locations covering a total area of 1800 km(2) in the South of China. (220)Rn concentrations were significantly different from that in the surface areas covered by the weathered granite of Yanshan Period or Quaternary sediments. The (220)Rn concentrations varied between 6.65 and 461 kBq m(-3) and the averages were 294.42 ± 81.36 and 23.30 ± 25.84 kBq m(-3) for weathered granite products and sediments, respectively. A high positive correlation between (220)Rn concentrations and (232)Th activity concentrations was found. (220)Rn concentrations had no statistically significant variations from depths of 20-140 cm with an interval of 20 cm. It is worth paying attention to the problem of such a high soil (220)Rn concentration in Zhuhai City and Zhongshan City.
为了解高辐射本底地区土壤气中（220）Rn浓度水平及分布情况，首次在中国南方1800 km²的67个地点使用RAD7便携式氡监测仪开展了（220）Rn调查。（220）Rn浓度与燕山期风化花岗岩或第四纪沉积物覆盖的地表区域存在显著差异。（220）Rn浓度在6.65至461 kBq m⁻³之间变化，风化花岗岩产物和沉积物的平均值分别为294.42±81.36和23.30±25.84 kBq m⁻³。发现（220）Rn浓度与（232）Th活度浓度之间存在高度正相关。（220）Rn浓度在20 - 140 cm深度范围内，间隔20 cm，无统计学显著变化。珠海市和中山市土壤（220）Rn浓度如此之高的问题值得关注。
