Download or read book Certification of a Three component Isotopic Reference Material of Uranium EC Nuclear Reference Material 199 written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Certification of a Three Component Isotopic Reference Material of Uranium written by R. Damen and published by . This book was released on 1994-06-01 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Standard Reference Materials Uranium Isotopic Standard Reference Materials written by L. E. Garner and published by . This book was released on 1971 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Uranium Isotopic Standard Reference Materials written by E. L. Garner and published by . This book was released on 1971 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book IRMM 2030 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 the IRMM-2030 uranium nitrate solution reference material, 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]. This certification project was a collaboration between the Joint Research Centre's Unit G.2 in Geel/Belgium, the Urenco facility in Gronau/Germany and the Analytical Services Laboratory of Unit JRC-G.II.8 of the Joint Research Centre in Karlsruhe/Germany. The IRMM-2030 reference material has been prepared in order to provide a uranium nitrate solution isotopic reference material with an isotope amount fraction n(235U)/n(U) of 6 %, commonly called a 235U enrichment of 6 %, in response to a need expressed by nuclear industry. This reference material is particularly needed at enrichment facilities such as Urenco/Germany that typically enrich 235U between 3 %and 5 % but are aiming to enrich uranium up to 6 %. The material was also requested by the International Atomic Energy Agency (IAEA) as a reference material for quality control (QC) purposes. For the preparation of IRMM-2030, two already characterized uranium base materials were mixed to achieve a 235U enrichment within limits specified by the requestor. The first material was a previously characterized UF6 material named UREU502648 with a 235U enrichment of about 4.9 %. The UF6 material was hydrolysed and converted to a uranyl nitrate solution. The second base material is a solution prepared from the certified reference material NBL U500 with a 235U enrichment of about 50 %. By the use of this highly enriched second base material, the lower 234U, 235U and 236U abundances of the first base material were increased to achieve the specified 234U, 235U and 236U abundances for IRMM-2030 simultaneously in one mixing step. The isotopic composition of the base solution IRMM-2030 was measured and certified using the TIMS/MTE method at JRC-G.2 in Geel. After dilution and dispensing into screw-cap quartz ampoules, the isotope ratios were verified for three randomly stratified chosen ampoules internally at JRC-G2 in Geel. The Analytical Service Laboratory at JRC-G.II.8 in Karlsruhe verified independently another set of three randomly stratified chosen ampoules. The isotopic reference material IRMM-2030 with an enrichment of 6 % for 235U is part of a systematic program of JRC-G.2 to supply isotope reference materials to the safeguards community and to partners and stakeholders. IRMM-2030 can also be considered as an extension of the IRMM-2019-2029 uranium solution reference materials [4, 5] with 235U enrichments from 0.16 % - 5.0 % towards a 235U enrichment of 6 %. These reference materials are intended for the calibration of instruments and methods, quality control purposes. As with any certified reference material, they can also be used for validation studies.
Download or read book Uranium Isotopic Standard Reference Materials written by E. L. Garner and published by . This book was released on 1971 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Standard Reference Materials written by E. L. Garner and published by Forgotten Books. This book was released on 2017-11-18 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Standard Reference Materials: Uranium Isotopic Standard Reference Materials (Certification of Uranium Isotopic Standard Reference Materials) Methods for the Chemical Analysis of nbs Copper - Base Spectrochemical Standards, October 1965. 60 cents. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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 Preparation and Certification of Uranium QUAD Isotopic Reference Materials IRMM 3100 and IRMM 3102 written by and published by . This book was released on 2008 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Isotopic reference material IRMM-3101 was prepared by mixing of solutions from highly enriched 99.96% 233U (IRMM-3630), 99.994% 235U (IRMM-3650), 99.97% 236U (IRMM-3660) and 99.99998% 238U (IRMM-3680) in order to obtain an isotopic ratio n(233U)/n(235U)/n(236U)/n(238U) close to unity. IRMM-3100 and IRMM-3102 were prepared from IRMM-3101 by gravimetrical dilution. The certified isotope amount ratio for ratio n(233U)/n(236U) has been established by mass metrology and was verified by isotope mass spectrometry. The methodology used in the preparation and certification was similar to that of comparable uranium mixtures made in the past. The certified ratios n(234U)/n(236U), (235U)/n(236U) and (238U)/n(236U) have been achieved by TIMS using the n(233U)/n(236U) as internal standard. Verification of the Quad isotopic reference material was performed on two independent TRITON by TIMS multidynamic measurements on Faraday collectors. The results agreed well with the certified values obtained from the mixing calculations. The Isotopic Reference Materials IRMM-3100, IRMM-3101 and IRMM-3102 are part of a systematic IRMM programme to supply Isotopic Reference Materials of various isotopes at different concentrations. The Isotopic Reference Material is supplied in a polyethylene ampoule containing 1 mL of a 1 M nitric acid solution.
Download or read book Uranium Isotopic Standard Reference Materials written by E. L. Garner and published by . This book was released on 1971 with total page 89 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:
Download or read book Uranium Isotopic Standard 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:
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 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 235 Uranium Isotope Abundance Certified Reference Material for Gamma Spectrometry written by Paul De Bièvre and published by European Communities. This book was released on 1986-12-01 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Euro Abstracts written by and published by . This book was released on 1994 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
