用中子活化分析法对阿伏伽德罗硅晶体WASO 04的元素表征
Elemental characterization of the Avogadro silicon crystal WASO 04 by neutron activation analysis
摘要：
用于测定阿伏伽德罗常数的28 Si晶体的分析测量是必不可少的，以防止有偏见的结果或低估的不确定性。对现有数据的回顾证实了硅相对于大量元素的高纯度。为了获得纯度的直接证据，我们发展了一种基于中子活化的相关分析方法。作为初步试验，将该方法应用于阿伏伽德罗晶体WASO 04的样品。调查涉及29个要素。Au的质量分数定量为1.03（18）x 10-12。对于其余28种元素，质量分数低于检测限，其范围在1 x 10-12和1 x 10-5之间。
英文摘要：
Analytical measurements of the 28Si crystal used for the determination of the Avogadro constant are essential to prevent biased results or under-estimated uncertainties. A review of the existing data confirms the high-purity of silicon with respect to a large number of elements. In order to obtain a direct evidence of purity, we developed a relative analytical method based on neutron activation. As a preliminary test, this method was applied to a sample of the Avogadro crystal WASO 04. The investigation concerned twenty-nine elements. The mass fraction of Au was quantified to be 1.03(18) x 10-12. For the remaining twenty-eight elements, the mass fractions are below the detection limits, which range between 1 x 10-12 and 1 x 10-5.
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