使用电感耦合等离子体质谱法同时测定237Np和钚同位素：对美国国家标准与技术研究院环境基质标准参考物质4357、1646a和2702的分析
Concurrent determination of 237Np and Pu isotopes using ICP-MS: analysis of NIST environmental matrix standard reference materials 4357, 1646a, and 2702.
作者信息
Matteson Brent S, Hanson Susan K, Miller Jeffrey L, Oldham Warren J
机构信息
Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA.
Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA.
出版信息
J Environ Radioact. 2015 Apr;142:62-7. doi: 10.1016/j.jenvrad.2015.01.007. Epub 2015 Jan 30.
An optimized method was developed to analyze environmental soil and sediment samples for (237)Np, (239)Pu, and (240)Pu by ICP-MS using a (242)Pu isotope dilution standard. The high yield, short time frame required for analysis, and the commercial availability of the (242)Pu tracer are significant advantages of the method. Control experiments designed to assess method uncertainty, including variation in inter-element fractionation that occurs during the purification protocol, suggest that the overall precision for measurements of (237)Np is typically on the order of ± 5%. Measurements of the (237)Np concentration in a Peruvian Soil blank (NIST SRM 4355) spiked with a known concentration of (237)Np tracer confirmed the accuracy of the method, agreeing well with the expected value. The method has been used to determine neptunium and plutonium concentrations in several environmental matrix standard reference materials available from NIST: SRM 4357 (Radioactivity Standard), SRM 1646a (Estuarine Sediment) and SRM 2702 (Inorganics in Marine Sediment).
开发了一种优化方法，用于通过电感耦合等离子体质谱法（ICP-MS），使用²⁴²Pu同位素稀释标准分析环境土壤和沉积物样品中的²³⁷Np、²³⁹Pu和²⁴⁰Pu。该方法具有高回收率、分析所需时间短以及²⁴²Pu示踪剂可商购等显著优点。为评估方法的不确定性而设计的对照实验，包括在纯化方案过程中发生的元素间分馏变化，表明²³⁷Np测量的总体精密度通常在±5%左右。对添加了已知浓度²³⁷Np示踪剂的秘鲁土壤空白样（NIST SRM 4355）中²³⁷Np浓度的测量，证实了该方法的准确性，与预期值吻合良好。该方法已用于测定美国国家标准与技术研究院（NIST）提供的几种环境基质标准参考物质中的镎和钚浓度：SRM 4357（放射性标准）、SRM 1646a（河口沉积物）和SRM 2702（海洋沉积物中的无机物）。
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