【摘要】 我国陆地１３７Ｃｓ沉积所造成的γ辐射剂量率，以均匀分布模式进行估算比较合理。以此得到，我国各省的１３７Ｃｓγ辐射剂量率的均值在（７—１８） ×１０－１０Ｇｙｈ－１之间，约占陆地总的γ辐射剂量率的１％－３％；考虑到人口的分布，全国的平均值约为９×１０－１０Ｇｙｈ－１，约占总γ剂量率的１．５％左右。但最高值可达 １．７ × １０－８Ｇｙｈ－１，与其它任一天然放射性核素的贡献相接近。与此相比较，如果用张弛长度为 ３ｃｍ的指数分布模式估算，１３７Ｃｓ γ辐射剂量率的贡献比用均匀分布模式约高 １倍。更多还原

【Abstract】 Cs deposited on the Chinese land produces r dose rate. It is fairly reasonable to estimate its contribution by using the uniform distribution model. In this study, the province averages of 137Cs r dose rate were found to be (7-18 ) x 10 -10,Gyh -1, which correspond to 1 % --3% of total r dose rate on land. The average of whole country was about 9 x 10 -10Gyh -1 and 1. 5% of total r dose rate when took the population distribution into consideration. The maximum was 1. 7 x 10 -8Gyh -1 which approached to the contribution from any natural radionuclide series. The results for 137Cs r dose rate estimated by using the exponential distribution model with 3cm average depth were about twice as large as those estimated by using the uniform distribution one.更多还原