Mácsik Zsuzsanna, Shinonaga Taeko
Institute of Nuclear Techniques, Budapest University of Technology and Economics, Muegyetem rkp. 9, H-1111 Budapest, Hungary.
Appl Radiat Isot. 2010 Dec;68(12):2147-52. doi: 10.1016/j.apradiso.2010.07.006. Epub 2010 Jul 18.
The accuracy and precision of the determination of (238)Pu amount at the fg (mBq) level by a combination of alpha spectrometry and inductively coupled plasma mass spectrometry (ICP-MS) were studied using a standard reference material (CRM 137-Plutonium [corrected] Isotopic Standard, National Bureau of Standards, Washington, D.C., USA). The activity of (238)Pu was calculated from the amount of (239)Pu and (240)Pu obtained by isotope dilution method and ICP-MS combined with the intensity ratio of (238)Pu/(239,240)Pu obtained by alpha spectrometry without adding spike. The results show that approximately 130 fg of (238)Pu can be analyzed within an accuracy of 7% bias and with 5-12% of total uncertainty. The examined analytical procedure was applied to the quantitative analysis of (238)Pu in water samples representing Safeguards inspection samples. The combination of alpha spectrometry and ICP-MS is useful for quantitative and isotopic analysis in low-level Pu samples. Also the method leads to improving the accuracy of (238)Pu determination because efficiency calibration is not necessary for alpha spectrometry.
使用标准参考物质（美国华盛顿特区国家标准局的CRM 137 - 钚[校正后]同位素标准），研究了通过α能谱法和电感耦合等离子体质谱法（ICP - MS）相结合在飞克（毫贝克勒尔）水平测定（238）钚含量的准确性和精密度。（238）钚的活度是根据通过同位素稀释法和ICP - MS获得的（239）钚和（240）钚的量，并结合不添加示踪剂时通过α能谱法获得的（238）钚/（239,240）钚强度比来计算的。结果表明，在偏差为7%的准确度和总不确定度为5 - 12%的情况下，可以分析约130飞克的（238）钚。所研究的分析程序应用于代表保障监督检查样品的水样中（238）钚的定量分析。α能谱法和ICP - MS的结合对于低水平钚样品的定量和同位素分析很有用。而且该方法提高了（238）钚测定的准确性，因为α能谱法不需要效率校准。
