中子活化分析法作为标准物质元素定值权威方法的研究

NEUTRON ACTIVATION ANALYSIS──A DEFINITIVE METHOD FOR MULTIELEMENT CERTIFICATIONS OF REFERENCE MATERIALS

中子活化分析全面参量化方法与传统的相对比较法相结合，初步满足了国际标准化组织（ＩＳＯ）对标准物质（ＲＭ）元素定值权威（ｄｅｆｉｎｉｔｉｖｅ）方法的定义。首次提出了中子活化分析法可作为ＲＭ一批元素定值的权威方法。对典型的地质、岩石围环境有证标准物质ＣＲＭ（ＮＢＳ－２７８，１６３３ａ，ＵＳＧＳ－ＢＣＲ－１，ＩＡＥＡ－ＳＬ－３和ＧＳＤ－１２）的分析结果表明：Ａｌ、Ａｓ、Ｃｅ、Ｃｏ、Ｃｒ、Ｃｓ、Ｅｕ、Ｆｅ、Ｈｆ、Ｌａ、Ｌｕ、Ｍｎ、Ｎａ、Ｒｂ、Ｓｂ、Ｓｃ、Ｔａ、Ｔｂ、Ｔｈ、Ｙｂ等２０种元素的实验测定值与推荐值在误差范围符合得很好，总不确定度小于５％，从而使中子活化分析法作为权威方法得到初步证实。

The lack of definitive methods for trace element certifications is one of the major obstacles in the certifications of reference materials. The realization of fully parametric standardization in our lab makes for the first time it possible to make NAA (by our procedures) a definitive method for certifications of multielements, especially trace elements, in various RMs. As the first phase of the project, our NAA procedures have been proven to be qualified as a definitive method for the following 20 elements, Al, As, Ce, Co, Cr, Cs, Eu, Fe, Hf, La, Lu, Mn, Na, Rb, Sb, Sc,Ta, Tb, Th, Yb in some typical geological and environmental reference materials.