Characterisation of a radionuclide specific laboratory detector system for the metallurgical industry by Monte Carlo simulations

One of the outputs of the European Metrology Research Programme project “Ionising radiation metrology for the metallurgical industry” (MetroMetal) was a recommendation on a novel radionuclide specific detector system optimized for the measurement of radioactivity in metallurgical samples. The detection efficiency of the recommended system for the standards of cast steel, slag and fume dust developed within the project was characterized by Monte Carlo (MC) simulations performed using different MC codes. Capabilities of MC codes were also tested for simulation of true coincidence summing (TCS) effects for several radionuclides of interest in the metallurgical industry. The TCS correction factors reached up to 32 % showing that the TCS effects are of high importance in close measurement geometries met in routine analyses of metallurgical samples.JRC.D.4-Standards for Nuclear Safety, Security and Safeguard

Characterisation of a radionuclide specific laboratory detector system for the metallurgical industry by Monte Carlo simulations

Kierrätysmetallia hyödyntävissä metallisulattamoissa saattaa lopputuotteena saatavaan teräkseen tai muuhun materiaaliin joutua radioaktiivisia aineita. Tuotteen radiologinen puhtaus todetaan yleensä laboratoriomittauksin. Artikkelissa kuvataan eurooppalaisessa metrologian tutkimusohjelmassa kehitetty optimaalinen mittausjärjestely, jolla epäpuhtaudet havaitaan mahdollisimman tehokkaasti. Mittausjärjestelmän ominaisuuksia on testattu laskennallisia menetelmiä käyttäen

Results of the EURAMET.RI(II)- S7.Sm-151 supplementary comparison (EURAMET Project 1292)

An international comparison of the activity standardisation of the relatively long-lived gamma-ray emitter 151Sm has been recently completed. A total of six laboratories measured a solution prepared by CEA/LNHB and CEA/LANIE. Aliquots of the master solution were standardized in terms of activity per mass unit by participant laboratories using 2 different techniques. The results of the comparison can be used as the basis for establishing equivalence among the laboratories. The activity measurements of this comparison are part of the joint research project “Metrology for Radioactive Waste Management” of the European Metrology Research Programme (EMRP). One aim of this project is a new determination of the 151Sm half-life.JRC.D.4-Standards for Nuclear Safety, Security and Safeguard

Determination of the 151Sm half-life

New measurements have been undertaken to determine the half-life of 151Sm. A pure 151Sm solution was obtained after chemical separation from a samarium solution resulting from the dissolution of an irradiated samarium sample. The concentration of 151Sm in the solution was measured by mass spectrometry, combined with the isotope dilution technique. The activity of the solution was measured by liquid scintillation counting by six European laboratories as part of an international comparison. These combined results lead to a half-life of T1/2 = 94.6(6) a.JRC.D.4-Standards for Nuclear Safety, Security and Safeguard

The CCRI(II)-K2.Fe-55.2019 key comparison of activity concentration measurements of a 55^{55}Fe solution

International audienceA comparison of the activity concentration of an 55 Fe solution was organized by the POLATOM under the auspices of the CCRI(II). The solution was sent to thirteen laboratories; ready-to-measure sources were also prepared using the same 55 Fe solution in diffusive (polyethylene) vials and sent to twelve laboratories. Twelve measurement reports were received. The results, as well as relevant information on the measurement techniques, are presented and analysed in this paper. The differences in the results obtained from measurements in non-diffusive (glass) and diffusive vials are indicated. To reach the main text of this paper, click on Final Report . Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/ . The final report has been peer-reviewed and approved for publication by the CCRI, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA)

Results of an international comparison for the activity measurement of 177Lu

An international Key Comparison of 177Lu has recently been carried out. A total of twelve laboratories performed assays for radioactivity content on aliquots of a common master solution of 177Lu, leading to eleven results submitted for entry into the Key Comparison Database or the Mutual Recognition Arrangement. A proposed Comparison Reference Value (CRV) was calculated to be 3.288(5) MBq·g-1 using all eleven results. Degrees of equivalence (DOE) and their associated uncertainties were calculated for each reporting laboratory based on the CRV. Most of the values reported by the participating laboratories were within 0.6 % of the CRV.JRC.D.4-Standards for Nuclear Safety, Security and Safeguard

Results of an international comparison of activity measurements of 68 Ge

Proceedings of the 21st International Conference on Radionuclide Metrology and its Applications (ICRM), May 15-19, 2017, Buenos Aires, Argentina. Organizer: Argentinian National Atomic Energy CommissionInternational audienceAn international key comparison, identifier CCRI(II)-K2.Ge-68, has been performed. The National Institute of Standards and Technology (NIST) served as the pilot laboratory, distributing aliquots of a 68Ge/68Ga solution. Results for the activity concentration, CA, of 68Ge at a reference date of 12h00 UTC 14 November 2014 were submitted by 17 laboratories, encompassing many variants of coincidence methods and liquid-scintillation counting methods. The first use of 4π(Cherenkov)β-γ coincidence and anticoincidence methods in an international comparison is reported. One participant reported results by secondary methods only. Two results, both utilizing pure liquid-scintillation methods, were identified as outliers. Evaluation using the Power-Moderated Mean method results in a proposed Comparison Reference Value (CRV) of 621.7(11) kBq g−1, based on 14 results. The degrees of equivalence and their associated uncertainties are evaluated for each participant. Several participants submitted 3.6 mL ampoules to the BIPM to link the comparison to the International Reference System (SIR) which may lead to the evaluation of a Key Comparison Reference Value and associated degrees of equivalence