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 The Preparation and Certification of a Uranium Reference Material written by and published by . This book was released on 1983 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the preparation, analysis, and certification of a bulk sample of low-grade uranium ore for use as a reference material. An investigation into its state of radioactive equilibrium established that the material is suitable for the purpose for which it is primarily intended, ie, the calibration of radiometric sorting equipment on mines. Eleven South African laboratories, using several well-established analytical techniques, contributed data on the uranium content of the material.

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 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 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 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 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 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 CERTIFICATION of a Uranium Reference Material for Chemical Analyses written by and published by . This book was released on 1983 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Preparation and Certification of IRMM 1000a 20 Mg and IRMM 1000b 50 Mg written by and published by . This book was released on 2015 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the production and certification of IRMM-1000a and IRMM-1000b, uranium reference materials certified for the production date based on the 230Th/234U radiochronometer, which corresponds to the last chemical separation, i.e. the removal of any 230Th from the material to the maximum extent achievable. The starting material was low-enriched uranium with a relative mass fraction, m(235U)/m(U) of 3.6 %. The targeted completeness for the last chemical separation of the 230Th decay product from its parent nuclide 234U was achieved. The certified production date was assigned following ISO Guide 34:2009. The between unit-homogeneity and the stability of the certified value were assessed in accordance with ISO Guide 35:2006. The uncertainty of the certified value was estimated in compliance with the Guide to the Expression of Uncertainty in Measurement (GUM) and includes uncertainties related to characterisation, possible inhomogeneity and instability. The material is mainly intended for calibration of methods, quality control, and assessment of method performance with isotope mass spectrometry and radiometry techniques. As any reference material, it can also be used for control charts or validation studies. The certified reference material is available in two sizes: 20 mg (IRMM-1000a) and 50 mg uranium (IRMM-1000b) as dried uranyl nitrate in screw-cap TeflonÒ (PFA) vials.

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 Certification of a Uranium Metal Reference Material for Chemical Analyses written by Commission of the European Communities. Central Bureau for Nuclear Measurements and published by . This book was released on 1983 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Nuclear Science and Technology written by Commission of the European Communities and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Certification of a Uranium Metal Reference Material for Chemical Analyses written by Y. Le Duigou and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Preparation and Certification of Highly Enriched Uranium Nitrate Solutions IRMM 3000 Series written by and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Directorate G "Nuclear Safety and Security", Unit G.2 "Standards for Nuclear Safety, Security and Safeguards" (SN3S) at the European Commission's Joint Research Centre, Geel in Belgium (formerly known as the "Institute for Reference Materials and Measurements" (IRMM)), provides a wide range of nuclear Certified Reference Materials (CRMs) to the safeguards authorities and the nuclear industry. This is an obligation under the Euratom treaty, where the need for isotope standards is explicitly mentioned, acknowledging their importance for the measurements of nuclear materials. For accurate mass spectrometric measurements in nuclear material accountancy and nuclear safeguards, suitable CRMs are needed to validate measurement procedures and to calibrate instruments. In particular, for mass spectrometry, CRMs are needed which have been prepared and characterized using procedures which are independent on mass spectrometric techniques as much as possible. One possible way to achieve this, is to use highly isotopically enriched starting materials and mix them under gravimetrical control in the correct proportions to achieve given targets for the isotope ratios. This procedure has been applied for the preparation of uranium and plutonium isotope CRMs for many years by several institutions, like NIST, NBL and IRMM/JRC-Geel. In the 1980s, the IRMM-072 series [7] of isotope mixtures containing 233U, 235U and 238U in various proportions was prepared based on this approach/method. About 20 years later, the isotope mixing program was restarted, and several further isotope CRMs were prepared and certified: the IRMM-074 [4] and IRMM-075 series [5], and the IRMM-3636a double spike [6]. In 2009, the IRMM-3000 series was prepared. It consists of a set of five highly enriched uranium nitrate solution reference materials named IRMM-3020, IRMM-3035, IRMM-3050, IRMM-3075 and IRMM-3090 with 235U enrichments varying from 20 % to 90 %. The solutions were prepared by dissolving uranium oxide (U3O8) materials, which were prepared by gravimetrically mixing oxides that are highly enriched in 235U and 238U. However, the verification measurements by TIMS showed some significant differences from the calculations based on the gravimetrical preparation. It was suspected that incomplete impurity analyses of the 238U starting material could be the cause for most of the differences, but this could not be confirmed at that time. Recently, the certification project for the IRMM-3000 series was restarted, including new mass spectrometric analyses of the isotope ratios performed at several laboratories and new impurity analysis for the 238U starting material.

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: