就地HPGeγ谱仪不同距离上的有效前面积和角响应刻度  

EFA and Angle Response Calculation for in-situ HPGe Detector at Different Distances

作　　者：苏川英[1,2] 吴睿[1,2] 冯天成[2] 成智威[2] 龙斌[2] 李公平[1] 

机构地区：[1]兰州大学核科学与技术学院,兰州730000 [2]西北核技术研究所,西安710024

出　　处：《核电子学与探测技术》2013年第5期641-646,共6页Nuclear Electronics & Detection Technology

摘　　要：用"Beck"公式计算就地γ谱仪探测效率时,所用参数主要有探测器有效前面积(EFA)和角响应。通过点源实验和ISOCS无源刻度软件计算获得一宽能HPGe探测器的EFA和角响应,并给出了其随探测距离的变化规律。结果表明,当测量对象与探测器间距离大于1 m时,可使用1 m时的刻度参数计算效率转换因子;当距离小于1 m时,应采用实际测量距离下的刻度参数计算或进行距离修正。In the efficiency conversion factor of in - situ gamma spectrometer by Beck formula, the parameters of effective front area （EFA） and angular response are indispensable. The experiments to obtain these two param- eters of one wide - energy HPGe detector were performed by measuring point source and in - situ object count- ing system （ ISOCS）, and the values and trends as a function of the distance were obtained. The results indica- ted that the values of the parameters at lm could be used to calculate the efficiency conversion factor when the distance from the object to the detector was farther than lm. When the distance was less than lm, efficiency conversion factor must be calculated in accordance with the true values of these two parameters at different dis- tance, or corrected depending on the distance.

关 键 词：就地Γ谱仪 效率刻度 有效前面积 角响应 Beck公式 

分 类 号：TL81[核科学技术—核技术及应用]