氧化钚属性测量技术研究  

Investigation on the attribute detection of plutonium oxide

作　　者：刘素萍[1] 郝樊华[1] 龚建[1] 伍怀龙[1] 胡广春[1] 胡永波[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,绵阳621900

出　　处：《核技术》2006年第12期936-940,共5页Nuclear Techniques

摘　　要：利用高分辨高纯锗γ谱仪,在铅屏蔽室内,对100g回收氧化钚粉末样品和8g纯氧化钚粉末样品分别进行了长时间测量,在自然环境,对200g回收氧化钚粉末样品进行了现场探测。在三个样品的能谱中均观察到871keV特征γ射线,除此之外,没有观察到其它与氧的存在相关的特征射线。同过去所测的金属钚谱相比较,在金属钚谱中未曾发现871keV特征γ射线。因此,就核查区分封闭容器罐中的钚材料是金属钚还是化合钚而言,可以用871keV来旁证“金属钚的不存在”。对200g氧化钚样品的现场探测表明,871keV能峰是明显存在的,而且自编的丰度和年龄分析软件能从10min测量能谱中识别出871keV能峰。如果将属性测量系统的分析软件和控制部分进行适当改进,该系统就具备通过监测871keV能峰确定氧化钚属性的能力。A long-term detection of the 871 keV gamma-ray emitted from two PuO2 samples （100 g recovered powder and 8 g pure powder） has been conducted with a high resolution HPGe spectrometer in a lead-shielded chamber. An on-site detection of the 871 keV gamma-ray emitted from 200 g recovered PuO： powder has also been performed. Although the 871 keV peak can be observed in all 3 samples, other characteristic gamma-rays related to the existence of oxygen are not seen. The 871 keV peak is absent in spectra acquired from metal plutonium samples, which can answer whether the plutonium material in a sealed container is metal plutonium or plutonium oxide, i.e. the 871 keV gamma-ray can be an evidence for the absence of metal plutonium. The 871 keV peak is strong in the spectrum of 200 g recovered PuOz sample. A software of plutonium abundance and age analysis developed by ourselves can identify the 871 keV peak from a spectrum of 10 min. If the system is appropriately improved, it can be used to detect attribute of plutonium oxide through identifying 871 keV gamma-ray peak.

关 键 词：氧化钚属性 封闭容器罐 金属钚 氧化钚 核查 

分 类 号：TL273[核科学技术—核燃料循环与材料]