Please use this identifier to cite or link to this item:
|Title:||Investigation on the long-term stability of IRMM-1027 series of Large-Sized Dried (LSD) spikes|
|Authors:||BUJAK RENATA; BAUWENS Jeroen; JAKOPIC Rozle; DE GROOTE M.; CARDON L.; AREGBE Yetunde|
|Citation:||ESARDA Bulletin no. 49 p. 46-48|
|Publisher:||Publications Office of the European Union|
|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|
Files in This Item:
There are no files associated with this item.
Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.