Journal
APPLIED RADIATION AND ISOTOPES
Volume 68, Issue 12, Pages 2147-2152Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.apradiso.2010.07.006
Keywords
(238)pu; Alpha spectrometry; ICP-MS; Safeguards; CRM 137; Environmental sample
Categories
Funding
- IAEA
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The accuracy and precision of the determination of Pu-238 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 136-Plutonium Isotopic Standard, National Bureau of Standards, Washington, D.C.. USA). The activity of Pu-238 was calculated from the amount of Pu-239 and Pu-240 obtained by isotope dilution method and ICP-MS combined with the intensity ratio of Pu-238/Pu-239.240 obtained by alpha spectrometry without adding spike. The results show that approximately 130 fg of Pu-238 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 Pu-238 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 Pu-238 determination because efficiency calibration is not necessary for alpha spectrometry. (C) 2010 Elsevier Ltd. All rights reserved.
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