不同结构建筑物对宇宙射线屏蔽修正因子测量  

Measurement of Cosmic Ray Shielding Correction Factor for Buildings with Different Structures

作　　者：郑国文[1] 陈凌[1] 

机构地区：[1]中国原子能科学研究院辐射安全研究所,北京102413

出　　处：《中国辐射卫生》2017年第3期334-336,共3页Chinese Journal of Radiological Health

摘　　要：目的提出一种新的建筑物对宇宙射线的屏蔽修正因子测量的方法,减小相关不确定度,提高评估居民室内所受剂量的准确度。方法采用高气压电离室和球形Na I(Tl)剂量率仪,对典型建筑结构窑洞、平房及楼房的不同楼层进行测量分析,得到相应建筑物对宇宙射线的屏蔽修正因子。结果所选典型平房对宇宙射线的屏蔽修正因子为0.61,石窑洞对宇宙射线的屏蔽修正因子为0.29~0.39,土窑洞对宇宙射线的屏蔽修正因子为0.13~0.17,楼房不同楼层对宇宙射线的屏蔽修正因子为0.40~0.81。结论窑洞对宇宙射线屏蔽修正因子随测量点与窗户间的距离增大而减小;楼房对宇宙射线屏蔽修正因子随楼层高度增加而增大,楼房中间楼层屏蔽修正因子接近一致,同一房间内屏蔽修正因子随测量点与窗户之间距离的增大而减小。Objective To put forward a new measurement method of different cosmic ray shielding correction factor for buildings which can reduce the uncertainty so that improve the accuracy of indoor dose rate assessment. Methods Based on HPIC and spherical NaI（T1） dose rate meter, cave, bungalows and different floors of the building were measured. According to the results, the cosmic ray shielding correction factor of each building was summarized. Results The cosmic ray shielding correction factor of the selected typical bungalow, stone cave ,soil cave and different floors of building is 0.61, 0.29 -0.39, 0.13 - 0.17 and 0.40 - 0.81. Conclusion Cosmic ray shielding correction factor of cave decreases with increasing the dis- tance between the measurement point to the windows. Cosmic ray shielding correction factor of building increases with the in- crease of floor height; and the shielding correction factors in middle floors are consistent. In the same room shielding correction factor decreases with increasing of the distance between the measurement point to the window.

关 键 词：宇宙射线 屏蔽修正因子 高气压电离室 NaI(Tl)剂量率仪 

分 类 号：R142.2[医药卫生—公共卫生与预防医学]