NaI(Tl)航测谱仪对 ^(137)Cs、^(60)Co 点源角响应的地面刻度  

CALIBRATION OF ANGLE RESPONSE OF A NaI(Tl) AIRBORNE SPECTROMETER TO 137 Cs AND 60 Co POINT SOURCES ON THE GROUND

作　　者：刘新华[1] 张永兴[1] 顾仁康[2,3] 沈恩升 

机构地区：[1]中国原子能科学研究院 [2]石家庄核工业航测遥感中心 [3]国家科委核安全中心

出　　处：《辐射防护》1998年第3期175-184,共10页Radiation Protection

摘　　要：在核事故应急监测航空测量中，角响应函数Ｆ（，θ）是航测谱仪的基本刻度量。本文主要报道ＮａＩ（Ｔｌ）航测谱仪对１３７Ｃｓ和６０Ｃｏ点源角响应函数的地面刻度方法及其结果，其不确定度一般小于２０％。利用该结果，采用数值积分方法，对地表均匀分布的１３７Ｃｓ沉积面源，计算了安装在运五飞机上的ＮａＩ（Ｔｌ）航测谱仪（３箱晶体）不同飞行高度的刻度因子，不确定度小于３０％。在石家庄航测动态测试带的天然本底辐射场下，９０ｍ和１２０ｍ飞行高度下的最小探测限分别为３．８和５．６ｋＢｑ／ｍ２。The angle response function F(φ,θ) is a basic calibration of airborne spectrometers in airborne surveying for nuclear emergency monitoring. This paper describes the method and results of angle response function calibration of a NaI(Tl) airborne spectrometer for 137 Cs and 60 Co point sources on the ground, with less than 20% uncertainty. By using the results, the calibra tion factors of the NaI(Tl) airborne spectrometer fixed in Yun 5 plane at different flying heights are calculated by numerical integral method for 137 Cs uniform area source on ground surface, with less than 25% uncertainty. The minimum detection limits (L D) are calculated at 90 m and 120 m flying heights in the range of over Shijiazhuang airborne surveying for 137 Cs uniform area source on ground surface to be 3.82 and 5.62 kBq/m 2, respectively. (

关 键 词：航空测量 角响应 地面刻度 核事故应急 谱仪 铯 

分 类 号：TL73[核科学技术—辐射防护及环境保护] TL817