雨后短时间环境地表γ剂量率数值变化研究

Analysis on Rising x-γ Dose in Atmosphere After Raining Using γ Field and Radon Daughter Element Falling Model

雨后数小时内近地表x-γ空气吸收剂量率数值将显著上升,持续一段时间之后,近地表x-γ空气吸收剂量率数值再次恢复为通常水平,为探明成因,通过大气氡分布理论得出氡子体沉降模型,利用该模型和γ场理论计算出近地表x-γ空气吸收剂量率数值上升区间,与近年杭州某辐射环境自动站x-γ空气吸收剂量率连续监测系统的实测历史数据比较,证明γ场理论和氡子体沉降模型对雨后短时间环境地表γ剂量率数值上升具有较好的理论解释和预测,并对辐射自动站选址和环境地表γ剂量率监测提供指导意义。

The value of x-γ absorbed dose rate in atmosphere rising after raining within a few hours,then the value will return to normal again after some hours. This paper uses γ field theory and radon daughter falling model to analyze the reason of x-γ absorbed dose rate rising and calculate the rising value interval. The results are in good accord with the data from Hangzhou automatic radiation monitoring station. It is proved that the γ field and radon daughter falling model have a good theoretical explanation for x-γ absorbed dose rate in atmosphere rising after raining within a few hours. This paper provides reference to the automatic radiation monitoring station location and environmental γ dose rate monitoring.