Download or read book Preparation and Certification of the Uranium Oxide Micro Particle Reference Material IRMM 2331P written by and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the certification of IRMM-2331P, a uranium micro particle reference material. This certification project was a collaboration between the Forschungszentrum Jülich (FZJ), Germany, and the Joint Research Centre (JRC), Unit G.2 in Geel, Belgium. The reference material was produced in compliance with ISO/IEC 17034:2016 [1] and certified in accordance with ISO Guide 35:2006 [2]. Uncertainties of the certified values were estimated in compliance with ISO/IEC Guide 98-3:2008 (the Guide to the Expression of Uncertainty in Measurement, GUM) [3]. In order to achieve "fit-for-purpose" isotope ratios for particle analysis, the base material IRMM-2330 was prepared by mixing of two uranium nitrate solutions, which were prepared by conversion of uranium hexafluoride (UF6) materials. Certification of the uranium isotopic composition for the base material IRMM-2330 was performed directly by Thermal Ionisation Mass Spectrometry (TIMS) using the Modified Total Evaporation (MTE) method at JRC-G2, and the results were verified by TIMS/MTE measurements at the IAEA. The production of the uranium particles was performed at the FZJ using a dedicated method based on spray-pyrolysis of droplets generated with a vibrating orifice aerosol generator (VOAG). Verification measurements of the base solution and 'process control measurements' on dissolved uranium particles were performed at the FZJ via Multi Collector Inductively Coupled Plasma Mass Spectrometry (MC-ICPMS) and the results agreed with the isotopic composition of the base solution IRMM-2330. This agreement permitted the certification of the isotopic composition for the particle reference material IRMM-2331P to be performed using the certified isotopic composition of the base material IRMM-2330. The reference material is intended for the calibration of instruments and methods, quality control purposes, and the assessment of method performance for isotope mass spectrometry on uranium particles. As with any certified reference material, it can also be used for validation studies. The following certified values and expanded uncertainties were assigned for isotope amount ratios, isotope amount fractions, isotope mass fractions, and molar mass for IRMM-2331P.

Download or read book Preparation and Certification of the Uranium Oxide Micro Particles IRMM 2329P written by and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the certification of the IRMM-2329P, a uranium micro particle reference material. This certification project was a collaboration between the International Atomic Energy Agency (IAEA-SGAS, Austria), the Forschungszentrum Jülich GmbH (FZJ, Germany) and the Joint Research Centre (JRC-Geel, Unit G.2). The material was produced in compliance with ISO/IEC 17034:2016 [1] and certified in accordance with ISO Guide 35:2006 [2]. Between-unit homogeneity was quantified and stability during dispatch and storage were investigated in accordance with ISO Guide 35:2006 [2]. Uncertainties of the certified values were estimated in compliance with ISO/IEC Guide 98-3:2008 (the Guide to the Expression of Uncertainty in Measurement, GUM) [3]. In order to achieve "fit for purpose" isotope ratios for particle analysis, the base material IRMM-2329 was prepared by mixing of two uranium nitrate solutions, which were prepared by hydrolysis and nitration of uranium hexafluoride (UF6) CRM's. Certification of the uranium isotopic composition was done by Thermal Ionisation Mass Spectrometry (TIMS) using the Modified Total Evaporation (MTE) method. Production of the uranium particles was done at the FZJ using a dedicated method based on spray-pyrolysis of droplets generated with a vibrating orifice aerosol generator (VOAG).Verification measurements of the base solution and 'process control measurements' on the uranium particles were performed at the IAEA-SGAS via Multi Collector Inductively Coupled Plasma Mass Spectrometry (MC-ICPMS). In addition to the isotopic composition, the uranium amount and mass per particle is certified by Isotope Dilution Thermal Ionisation Mass Spectrometry (ID-TIMS) and confirmed by ID-MC-ICPMS performed at IAEA-SGAS. Moreover, the certified values were established using new published values for the atomic masses and applying a 2-digit rounding rule. The materials are intended for the calibration of instruments and methods, quality control purposes, and the assessment of method performance for isotope mass spectrometry on uranium particles. As with any certified reference material, they can also be used for validation studies.

Download or read book Preparation and Certification of Uranium Oxide U3O8 Spectrometric Reference Materials written by PM. Santoliquido and published by . This book was released on 1991 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes the preparation, provisional certification, and certification of reference materials for the trace element analysis for uranium oxide (U3O8). The reference materials were prepared by the addition of solution pools containing the trace elements to a dry base of high-purity uranium oxide (U3O8) with subsequent mixing, drying, milling, and blending. Provisional certification was accomplished through an interlaboratory program in which four different laboratories analyzed the reference materials by carrier distillation d-c arc emission spectroscopy. The full certification of these reference material requires concordant results by two independent methods of analysis. Newer methods of analysis, such as graphite-furnace atomic absorption spectrophotometry and inductively-coupled plasma emission spectrometry, unavailable when the last reference material of this type was certified, have figured prominently in the certification of newer reference materials, a project now nearing completion.

Download or read book Preparation of Working Reference Materials Uranium Dioxide written by R. L. Hand and published by . This book was released on 1980 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Preparation and Certification of the Uranium Nitrate Solution Series IRMM 2019 2029 written by and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the certification of the IRMM-2019-2029 series of uranium nitrate solution reference materials and the revision of the uranium hexafluoride (UF6) reference materials series IRMM-019-029, both certified for the uranium isotopic composition. The certified values and their uncertainties were assigned following ISO 17034 [1], ISO Guide 35 [2] and the Guide to the Expression of Uncertainty in Measurement [3]. The IRMM-019-029 series of eleven uranium hexafluoride (UF6) reference materials was originally produced and certified in the 1980's-1990's. For the first re-certification performed in 2014, the UF6 materials were converted into eleven uranium nitrate solutions to perform the homogeneity and characterisation studies. These materials were characterised in compliance with ISO 17034 [1] by Thermal Ionisation Mass Spectrometry (TIMS), by taking advantage of newly established measurement procedures such as the Modified Total Evaporation (MTE) and Double Spike (DS) methods, and using a new set of certified uranium isotope reference materials, which were prepared by gravimetrical mixing of highly enriched 233U, 235U, 236U and 238U oxides or solutions. The results of the characterisation measurements were also confirmed by Gas Source Mass Spectrometry (GSMS) measurements using the original UF6 gases [4, 5]. For the certification of the isotopic composition of the IRMM-2019-2029 series each of the remaining uranium nitrate solutions used for the certification of IRMM-019-029 was diluted using one molar nitric acid to a concentration of about 2 mg uranium per g solution and dispensed into cleaned screw-cap quartz ampoules. Each ampoule contains 5 ml of solution. Subsequently "process control measurements" (PCM) by TIMS using the MTE and DS methods were performed for three ampoules for each of the reference materials. The results for the isotopic composition from the process control measurements on these uranium nitrate solutions agreed well with the certified values for IRMM-019-029 series of UF6 materials. Therefore no separate new characterisation and homogeneity studies were performed, and the certified values for IRMM-019-029 were assigned as well to the uranium solution reference material series IRMM-2019-2029. Moreover, certified values for both the IRMM-019-029 series of UF6 reference materials and the IRMM-2019-2029 series of uranium nitrate solution reference materials were established using new published values for the atomic masses and applying a 2-digit rounding rule. The materials are intended for the calibration of instruments, methods, quality control purposes, and the assessment of method performance for isotope mass spectrometry. As with any certified reference material, they can also be used for validation studies.

Download or read book Developments in Surface Contamination and Cleaning Volume 3 written by Rajiv Kohli and published by William Andrew. This book was released on 2011-03-25 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: The contributions in this volume cover methods for removal of particle contaminants on surfaces. Several of these methods are well established and have been employed in industrial applications for a long time. However, the ever- higher demand for removal of smaller particles on newer substrate materials is driving continuous development of the established cleaning methods and alternative innovative methods for particle removal. This book provides information on the latest developments in this topic area. - Comprehensive coverage of innovations in surface contamination and cleaning - Written by established experts in the contamination and cleaning field - Each chapter is a comprehensive review of the state of the art - Case studies included

Download or read book The Preparation and Certification of Ten Uranium Reference Materials written by Rosemary Grace Hansen and published by . This book was released on 1982 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Preparation and Certification of a Uranium Reference Material written by Rosemary Grace Hansen and published by . This book was released on 1983 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Certification of a Uranium Dioxide Reference Material for Chemical Analyses written by Commission of the European Communities and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Certification of Uranium Mass Fraction in IRMM 540R and IRMM 541 Uranium doped Oxide Glasses written by G. Roebben and published by . This book was released on 2006 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two reference materials (IRMM-540R and IRMM-541) have been certified. The CRMs consist of discs of specially prepared oxide glasses, containing respectively 15 and 50 mg/kg uranium (nominal values). The glasses were prepared from blended oxide powders with a limited amount of impurity elements of the kind that interfere with thermal neutron irradiation based methods. Glass rods were produced, which were then cut into discs of 2 mm thickness and 15 mm diameter and subsequently polished. The glass discs can be used for uranium determinations for example in geological samples using the fission-track dating method. The isotopic abundance ratio 235U/238U was measured and confirmed to be natural within the measurement uncertainty. The materials IRMM 540R and IRMM-541 are available as individual discs.

Download or read book Standard Reference Materials written by E. L. Garner and published by . This book was released on 1971 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Certification of a Uranium Dioxide Reference Material for Chemical Analyses written by Y. Le Duigou and published by . This book was released on 1983 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Standard reference materials uranium isotopic standart reference materials certification of uranium isotopic standart reference materials written by E. L. Garner and published by . This book was released on 1971 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: