摘要
通过氡在土壤中产生、衰变和扩散迁移规律的分析 ,建立模型 ,用数值方法模拟计算了累积法测量氡析出率时 ,集氡罩内氡浓度与氡析出率随时间变化规律。分析后认为用有效衰变常数计算氡析出率时 ,集氡罩应有一定高度 (本文条件下为 0 .5 m) ,而底部面积应当较小 ;用氡浓度增长曲线线性部分的斜率 (斜率法 )计算氡析出率时 ,集氡罩高度应当较低一些 ,但要适当选取累积时间 ,集氡罩底部面积则可适当大一些。
By analyzing the source, decay and diffusing transport, the mathematics model used to calculate distribution and radon exhalation rate was developed. The result shows that the closed-can method is limited by the can's size. For using the effective decays constant or line slope of radon concentration curve to calculate the exhalation rate, the height of the can should be more than a certain value which is 0.5 m in this case, and the radius of the can, for the former should be small, for the latter large. (
出处
《辐射防护》
CAS
CSCD
北大核心
2000年第4期205-209,253,共6页
Radiation Protection
关键词
氡析出率
模拟计算
土壤
累积法
集氡罩
Radon Exhalation Rate, Model Calculating, Effective Decay Constant, Line Slope)
