Certification Report: Preparation and Certification of Large-Size Dried (LSD) Spike: IRMM-1027w
Certified reference material for the masses of 239Pu, 235U, 238U and Pu and U isotope amount ratios
Large-Sized Dried (LSD) spikes are used as a fundamental part of the fissile material control of irradiated nuclear fuel and have been provided on a regular basis to safeguards authorities and industry for 30 years [ ]. This report describes the preparation and certification of a new batch of LSD spikes. IRMM-1027w is a dried mixture of uranyl- and plutonium nitrate in carboxymethyl cellulose (CMC). The material is certified for the masses of 235U, 238U and 239Pu and the uranium and plutonium isotope amount ratios per unit. The material was produced in accordance with ISO/IEC 17034:2016 [ ]. The homogeneity and stability were assessed in accordance with ISO Guide 35:2017 [ ] and the uncertainties of the certified values were calculated in accordance with Guide to the Expression of Uncertainty in Measurement (GUM) [ ].
The certified reference materials uranium metal NBL PO CRM 112-A, enriched uranium metal NBL PO CRM 116-A and plutonium metal CETAMA MP2 were used as starting materials to prepare the mother solution. This solution was dispensed into individual vials by means of an automated robot system and subsequently evaporated to dryness. A solution of carboxymethyl cellulose (CMC) was added to the spike material and evaporated and dried. The organic matrix serves as a stabiliser to retain the dried nuclear material at the bottom of the vial. In total, 862 units were produced.
TOTH Kalman;
JAKOPIC Rozle;
BAUWENS Jeroen;
HENNESSY Carmel;
KEHOE Mary Frances;
JAKOBSSON Ulf;
RICHTER Stephan;
AREGBE Yetunde;
2022-08-10
Publications Office of the European Union
JRC130296
978-92-76-55655-8 (online),
OP KJ-07-22-813-EN-N (online),
https://publications.jrc.ec.europa.eu/repository/handle/JRC130296,
10.2760/817757 (online),
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