高海拔地区累积剂量法测量环境地表γ辐射剂量水平方法探讨

Discussion on the Methods of Cumulative Dose Measurement for Environmental Terrestrial γ Radiation Dose Level in High Altitude Area

介绍了在西藏自治区自海拔1 500m^4 500m高度范围内,利用累积剂量方法测量环境地表γ辐射剂量的相关情况。考虑到不同海拔高度宇宙射线强度相差较大,本文对不同点位测量数据扣除了宇宙射线响应值,并与地表环境γ辐射剂量率瞬时测量值进行比对,结果表明:在高海拔地区累积剂量法测量环境地表γ辐射剂量率时,监测设备对宇宙射线的响应值可能远大于环境地表γ辐射剂量率值,在数据分析中需重点考虑;累积剂量法与瞬时剂量测量数据相对偏差在15%内,符合较好。

The cumulative dose measurement for detecting environmental terrestrial γradiation dose level from an altitude of 1 500 meters to 4 500 meters height range in Tibet was introduced in this paper.Considering the cosmic ray intensity at different altitudes differs a lot,the measurement results of different points were deducted from the cosmic ray response values and were compared with the corresponding instantaneous measurement values of environmental terrestrial γ radiation in the paper.The results showed that in the high altitude area,the response value of the monitoring equipment to the radiation dose rate of the cosmic rays may be far larger than the corresponding instantaneous measurement value of environmental terrestrial γ radiation,and this should be mainly considered in the cumulative dose measurement for environmental terrestrial γradiation dose level.The cumulative dose method accords well with the instantaneous dose measurement method with the relative deviation of 15％.