Title: Investigation on the long-term stability of IRMM-1027 series of Large-Sized Dried (LSD) spikes
Citation: ESARDA Bulletin no. 49 p. 46-48
Publisher: Publications Office of the European Union
Publication Year: 2013
JRC N°: JRC82105
ISSN: 0392-3029
URI: https://esarda.jrc.ec.europa.eu/
Type: Articles in periodicals and books
Abstract: The IRMM-1027 is a certified reference material for nuclear material control and accountancy. Each individual spike contains about 50 mg uranium (m(235U)/m(U) ~ 20%) and about 1.8 mg plutonium (m(239Pu)/m(Pu) ~ 98%) in dried form. They are used for the determination of U and Pu content of spent fuel solutions with isotope dilution mass spectrometry (IDMS) by plant operators and safeguards authorities. The dried uranyl and plutonium nitrates are embedded in an organic substance, which provides a stable layer at the bottom of the vial and preserves the integrity of the spike during storage and transport. Cellulose acetate butyrate (CAB) with 19 wt% butyryl content has been applied on the IRMM-1027 spikes for the last decade. However, the cellulose matrix containing the spike material tends to flake off after about two years. In order to prolong the shelf life of the spikes, JRC-IRMM has been investigating CABs with higher butyryl contents – 35 wt% and 52 wt% –, to optimize the chemical stability and to achieve a longer lasting layer. Empirical tests have shown that the higher the butyryl content, chemically the more stable and the more resistant the CAB is. Accordingly, future series of LSD spikes will be prepared with CAB containing 35 wt% butyryl, which should remain intact for at least 4 years. Furthermore, JRC-IRMM together with CPMT is investigating the chemical and mechanical properties of the three different CABs to further improve understanding on their stability and durability.
JRC Directorate:Health, Consumers and Reference Materials

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