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Journal Articles

Verification of LSD spikes prepared in Japan from a MOX source material

Sumi, Mika; Abe, Katsuo; Kageyama, Tomio; Nakazawa, Hiroaki; Kurosawa, Akira; Yamamoto, Masahiko; Mason, P.*; Neuhoff, J.*; Doubek, N.*; Balsley, S.*; et al.

Proceedings of INMM 51st Annual Meeting (CD-ROM), 9 Pages, 2010/07

Large Size Dried (LSD) spikes are currently used in many facilities in Japan (and around the world) for U and Pu accountancy analysis by Isotope Dilution Mass Spectrometry (IDMS). Because of the large quantity of plutonium standard materials are needed to support Japanese facilities for nuclear fuel cycle and expected difficulties in the long term supply and transport of Pu reference materials, JAEA decided to evaluate the possibility of using MOX stored at Plutonium Fuel Development Center (PFDC) as a source of Pu standard material for LSD spike preparation. At PFDC, Pu nitrate solution was prepared from MOX and two types of the LSD spikes were prepared. The samples of each spike were distributed for verification measurements to international and domestic laboratories. Details of the Pu make-up value evaluation, the LSD spike preparation and the evaluation of the verification results will be presented.

Journal Articles

Present status; Collaboration between NBL and JAEA on preparation of Pu reference material

Sumi, Mika; Kageyama, Tomio; Suzuki, Toru; Manson, P.*; Neuhoff, J.*

Proceedings of INMM 47th Annual Meeting (CD-ROM), 7 Pages, 2006/00

All accountancy analyses at the Plutonium Fuel Development Center (PFDC) of JAEA are performed by isotope dilution mass spectrometry (IDMS) with well-characterized standard materials, which prepared at PFDC itself from Pu and U reference materials. Currently, Pu reference materials must be obtained from foreign suppliers because there are no facilities in Japan with the capability for preparation and supply of Pu reference materials, and, importing those Pu reference materials is gradually becoming more difficult. Therefore, JAEA has started collaborative work with NBL for the preparation of Pu reference materials and associated Large Size Dried (LSD) spike. MOX powder which has been stored in JAEA was dissolved and ion-exchange was performed to obtain purified Pu solution at JAEA. Several aliquots had taken from the solution, dried, and sent to NBL for analysis. Pu samples were shipped and have arrived to NBL. After certification analysis on NBL, the Pu nitrate solution will be mixed with a U nitrate solution which prepared from CRMs. The uncertainty of the purified Pu solution and prepared LSD spikes will be evaluated by GUM method. This paper presents the present status and future plans for the collaboration work.

Oral presentation

Evaluation of isotopics and assay of Pu solution prepared from MOX as the base material of LSD spikes

Sumi, Mika; Suzuki, Toru; Kageyama, Tomio; Mason, P.*; Neuhoff, J.*

no journal, , 

JAEA, with the technical assistance of New Brunswick Laboratory, is developing the capability to produce a small quantity of plutonium material of suitable purity and composition to serve as the basis for standard material of isotope dilution mass spectrometry which called LSD spike. The starting material consists of a mixed oxide of plutonium and uranium (MOX). The MOX material was dissolved and subjected to a series of purification steps to remove as much uranium as possible. The purified plutonium solution was sampled and analyzed for both uranium and plutonium isotopics and elemental concentrations via isotope dilution mass spectrometry using the total evaporation method on thermal ionization mass spectrometers. This report describes the evaluation of the measurement data, performed at JAEA and summarizes the results of the detailed uncertainty analyses performed for each data set at NBL. The detailed uncertainty analyses are performed based on GUM.

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