Uranium enrichment measurement and attributes determination are important activities in mc & a system and routine safeguards inspections . y - ray spectrometry is important one of nda methods widely used in nuclear safeguards 铀样品的富集度分析及属性判定是核保障中衡算测量和核查测量的重要内容,能谱分析方法是核保障无损分析( nda )技术中重点研究的方法。