摘要
文章叙述钚处理设备物料滞留量监测仪的研制及其有关设备中和管道内钚的总α放射性的测量方法。监测仪硬件主要包括：可携式平面型ＨＰＧｅ探测器；φ５０ｍｍ×６０ｍｍＮａＩ（Ｔ１）探测器，可调γ射线束准直系统；ＯＲＴＥＣ９２Ｘ－Ｗ＿２能谱控制系统和ＡＳＴ－２８６计算机。软件主要包括Ｍａｅ－ｓｔｒｏ￣（ＴＭ）ｆｏｒＷｉｎｄｏｗ３和ＰＨＯＵＰ１滞留量用户软件。采用ＭＣＮＰ软件对复杂设备内钚源项γ射线到达设备外测量点的几率进行蒙特卡罗计算。采用多位置测量数据平均的方法来减小源项分布不均匀性的影响。在长寿命裂变产物γ剂量场为０．８×１０￣（－１０）Ｃ／ｋｇ·ｓ的环境下，监测仪对附着在３－８ｍｍ厚钢板上的模拟钚源的α放射性探测灵敏度好于３．７×１０￣６Ｂｑ／ｋｇ（钢板）。
The development of hold-up monitoring system for plutonium process tanks and a calculationmethod for a activities deposited in containers and inner walls of pipe are described in the paper.The hardware of monitoring system consists of a portable HPGe detector,a φ50 mm×60 mmNaI(T1)detector,γ-ray tungsten collimators,ORTEC92X Spectrum Master and an AST-286computer.The software of system includes Maestro￣(TM) for Window3 and a PHOUP1 hold-up ap-plication software for user.The Monte-Carlo simulation calculation supported by MCNP softwareis performed for the probability calculation of all the unscattering γ-rays reaching to the detectionpositions from the source terms deposited in the complicated tanks.A measurement mean valuefor different positions is used to minimize the effect of heterogeneous distribution of source term.The sensitivity is better than3.7×10￣6Bq/kg(steel)for a plutonium simulation source on a 3-8mm thick steel plate surrounded by 0.8 × 10￣(-10)C/kg·s γ field from long-life fission products.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
1994年第4期316-323,共8页
Atomic Energy Science and Technology
关键词
滞留量
监测器
钚
Γ谱
Hold-up Monitoring system Passive γ spectrum Monte-Carlo simulationcalculation
