对两种厚度氟化锂探测器质子响应特性的测量  

Measurements of Proton Response of two Lithium Fluoride Detectors with Different thicknesses.

作　　者：王根良[1] 祁章年[1] 陈湄[1] 黄增信[1] 李向高[1] 

机构地区：[1]航天医学工程研究所,北京100094

出　　处：《航天医学与医学工程》2000年第2期136-139,共4页Space Medicine & Medical Engineering

摘　　要：研究氟化锂 (LiF)探测器对质子注量率和能量的响应特性 ,并观察探测器的厚度效应。方法质子束流由加速器提供 ,质子能量改变通过改变加速器束流能量或利用探测器叠吸收能量两种方法实现 ,探测器叠中每层探测器的入射质子能量利用质子在LiF材料中的射程计算得到。结果探测器对质子注量率的响应基本不明显 ;对能量的响应是 :当质子能量大于 9MeV时是一常数 (误差小于 1 0 % ) ,当质子能量小于 9MeV时随质子能量的减少而逐渐降低 ;0 .4mm和 0 .8mm两种厚度探测器的厚度效应不明显。结论国产氟化锂探测器比较适合作空间辐射剂量测量应用 ,但当辐射场存在较多 9MeV以下的低能质子时 ,需考虑探测器相对热释光效率下降的特点。Objective To study the response characteristics of LiF detectors to proton fluence rate and energy, and to observe the thickness effect of the detector. Method Protons were generated by an accelerator. Proton energy was changed in two ways, i.e. changing the accelerator energy directly, or using detector stacks to absorb the proton energy. The incident proton energy on each chip of detector stacks was calculated according to proton range in LiF. Result The response of the detector to proton fluence rate was almost constant; when proton energy was above 9 MeV, the response of the detector to proton energy was constant (less than 10% errors). When proton energy was below 9 MeV, the response reduced gradually with the decrease of proton energy. Thickness effect for LiF thicknesses of 0.4mm and 0.8mm was not obvious. Conclusion The homemade LiF detector is suitable for measurement of space radiation dose. When proton component (below 9 MeV) was abundant in radiation field, the decrease of the relative thermoluminescence efficiency should be taken into consideration.

关 键 词：氟化锂探测器 质子 能量响应 太空测量 厚度效应 

分 类 号：TL816.7[核科学技术—核技术及应用] X85[环境科学与工程—环境工程]