大型高分辨分段γ扫描装置的研制  

DEVELOPMENT OF A SEGMENTED GAMMA RAYSCANNING SYSTEM

作　　者：朱荣保[1] 谭亚军[1] 袁晓鑫[1] 吕钊[1] 曹斌 吴昕 程炳皓[1] 许晓东 江金才 

机构地区：[1]中国原子能科学研究院

出　　处：《原子能科学技术》1994年第1期16-25,共10页Atomic Energy Science and Technology

摘　　要：文章描述了一台大型高分辨分段γ扫描装置。由近立体角三维自吸收校正模型计算自吸收校正系数ＣＦ（ＡＴ）与透射率Ｔ的函数关系。本装置设计了四位透射源轮和可调立体角的１３ｃｍ￣３ＨＰＧｅ探测器系统。采用￣（７５）Ｓｅ，￣（１６９）Ｙｂ作为透射源。扫描台架可容纳１─８０１已包装废物样品。借助于传感器、步进马达和马达驱动器以及计算机控制实现换源、档束器开闭、全自动分段旋转扫描和全自动数据获取与处理，并进行γ射线自吸收校正计算。对１１￣（２３５）Ｕ硝酸铀酰系列样品和￣（１９２）Ｉｒ硝酸溶液的系列样品进行了Ｋ值刻度。获得的Ｋ值平均标准偏差分别为±０．６２％和±０．４２％。该装置对测定中、低密度非均匀核返料、核废物中核材料含量或裂变产物含量有重要的应用价值。A segmented gamma ray scanning system is developed for the purposes of non-destructive as-say of the contents of uranium,plutonium or fission products existing in packed low density ormedian density nuclear residuals,scrapes or wastes.The near field three-dimensional model forcomputing CF(AT)is used for cylindrical sample and container.the system developed consists ofa transmission source wheel,a rotable seanning plate,a beam shutter,and annular shieldingthey,stepping motors and control system,HPGe detector, nuclear electronics and computer.The full scale scanning of samples,spectrum accumulation and data reduction could be fulfilled au-tomatically according to preset standard procedures. The radioisotopes of￣(169)Yb and￣(75) Se and usedas the transmission sources for assaying￣(235) U and potential￣(239) Pu respectively.The calibration ex-periments using 1 liter solution sample of￣(192) Ir and￣(235) U is performed. The standard deviations weobtained for￣(192)Ir γ rays of 295 keV, 308 keV and 316 keV are ± 0.41 %,±0. 29 % and ± 0.42 % respectively. The standard diviation for￣(235) U 185 keV γ ray is ±0. 62 %.

关 键 词：γ扫描 燃料循环 放射性废物 

分 类 号：TL249[核科学技术—核燃料循环与材料]