9 research outputs found

    Results of time-of-flight transmission measurements for 197Au at a 50 m station of GELINA

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    Transmission measurements have been performed at the time-of-flight facility GELINA to determine the total cross section for neutron induced reactions in 197Au. The measurements have been carried out at a 50 m transmission station of GELINA with the accelerator operating at 800 Hz. This report provides the experimental details required to deliver the data to the EXFOR data library which is maintained by the Nuclear Data Section of the IAEA and the Nuclear Energy Agency of the OECD. The experimental conditions and data reduction procedures are described. In addition, the full covariance information based on the AGS concept is given such that nuclear reaction model parameters together with their covariances can be derived in a least squares adjustment to the data.JRC.D.4-Standards for Nuclear Safety, Security and Safeguard

    Results of transmission measurements for 40Ca at GELINA

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    Transmission measurements have been performed at a 50 transmission station of the neutron time-of-flight facility GELINA to determine the total cross section for neutron induced reactions on 40Ca. These measurements are part of a collaboration of the Joint Research Centre and the Oak Ridge National Laboratory (US) to improve nuclear data for nuclear criticality safety applications. They have been supported by the EUFRAT project. This report provides the experimental details required to submit the data to the EXFOR data library which is maintained by the Nuclear Data Section of the IAEA and the Nuclear Energy Agency of the OECD. The experimental details, i.e. measurement conditions, sample characteristics, measurement procedures and experimental uncertainty components, together with the data reduction procedures are described. The experimental results including the full covariance information, based on the AGS-formalism, are reported following the latest recommendations of the International Nuclear Data Committee. This includes the information that is required to derive nuclear reaction model parameters together with their covariances by a least squares adjustment to experimental data.JRC.D.4-Standards for Nuclear Safety, Security and Safeguard

    Rejection on Report File program (RoRF): Technical description of the RoRF application developed at IRMM

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    For an efficient analysis of time-of-flight (TOF) data from DAQ2000 it is essential to make a pre selection of data taken under good conditions and eliminate those data (runs) with bad conditions. A program (RoRF) was developed to facilitate the selection.JRC.D.4-Standards for Nuclear Safety, Security and Safeguard

    Report of the Fourth Interlaboratory Comparison Organised by the Community Reference Laboratory for Heavy Metals in Feed and Food- Total Cd, Pb, As, Hg and Methylmercury in Seafood

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    The Institute for Reference Materials and Measurements (IRMM) of the Joint Research Centre (JRC), a Directorate-General of the European Commission, operates the Community Reference Laboratory for Heavy Metals in Feed and Food (CRL-HM). One of its core tasks is to organise interlaboratory comparisons (ILCs) among appointed National Reference laboratories (NRLs). This report presents the results of the fourth ILC of the CRL-HM which focused on the determination of total Cd, Pb, As, Hg and methylmercury (related to dry mass) in seafood. The test material used in this exercise was the Certified Reference Material (CRM) TORT-2, lobster hepatopancreas, of the National Research Council of Canada. The material was rebottled and relabelled to prevent recognition by the participants and it was dispatched in the first half of May 2008. Each participant received one bottle containing approximately 20g of test material. Thirty-four participants from twenty-six counttries registered to the exercise of which thirty-three sets of results were reported for Cd and total mercury, thirty-two for Pb, twenty-seven for arsenic and four for methylmercury. One laboratory reported two stes of values for Cd, Pb, Hg and As obtained with two different techniques, respectively. The Assigned values were the certified values taken from the TORT-2 certificate. The uncertainties of the respective assigned values, uref, were taken directly from the CRM certificate as provided by the producer. Participants were invited to report the uncertainty on their measurements. This was done by all the laboratories taking part in the exercise. Laboratory results were rated with z and zeta scores in accordance with ISO 13528. Standard deviation for profficiency assessment (also called target standard deviation) were calculated, using the modified Horwitz equation, and were 9.76% for total Cd, 18.74% for total Pb, 10% for total As, 19.48% for total Hg and 21.24% for methylmercury.JRC.D.4-Isotope measurement

    IMEP-24: Analysis of Eight Heavy Metals in Toys According to EN 71-3:1994

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    The Institute for Reference Materials and Measurements (IRMM) of the Joint Research Centre (JRC), a Directorate-General of the European Commission, operates the International Measurement Evaluation Programme (IMEP). It organises interlaboratory comparisons (ILC's) in support to EU policies. This report presents the results of an ILC which focussed on the determination of soluble antimony, arsenic, barium, cadmium, chromium, lead, mercury, and selenium according to European Standard EN 71-3:1994. The principle of the procedure in EN 71-3:1994 consists in the extraction of soluble elements from toy material under the conditions simulating the material remaining in contact with stomach acid for a period of time after swallowing. Forty participants from eighteen countries registered to the exercise, of which 33 reported results for As, 35 for Ba and Se, 37 for Cr, Pb, and Sb, 38 for Hg, and 39 for Cd. For seven measurands the test material had already been certified in the past. The validity of the certificate was reconfirmed and the certified values were taken as the reference values for this ILC. As no certified value was available for Hg, the mean value of the results provided by four expert laboratories was used together with the corresponding uncertainty. Participants were invited to report the uncertainty on their measurements. This was done by 35 of the 39 laboratories having submitted results in this exercise. Laboratory results were rated with z and zeta scores in accordance with ISO 13528. The standard deviations for proficiency assessment were based on the analytical correction laid down in EN 71-3:1994.JRC.D.8-Food safety and qualit

    IMEP-27: Total Cd, Pb and As and Extractable Cd and Pb in Mineral Feed

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    This report presents the results of an Interlaboratory Comparison (ILC) which focused on the determination of total Cd, Pb and As and extractable Cd and Pb in feed according to Directive 2002/32/EC1 of the European Parliament and of the Council on undesirable substances in animal feed. The test material used in this exercise was a commercial mineral feed provided by AGES, Zentrum Analytik und Mikrobiologie, in Austria. The material, naturally contaminated, was processed, bottled, labelled and dispatched by the Reference Materials Unit of the IRMM. The samples were dispatched on the second half of November 2008. Each participant received one bottle containing approximately 30 g of test material. Twenty-four participants from 11 countries registered to the exercise of which 19 submitted results for extractable Pb and Cd and 20 submitted results for total Pb, Cd and As. Three laboratories did not submit results. The assigned values (Xref) for total and extractable Cd and Pb were provided by IRMM using isotope dilution-inductively coupled plasma-mass spectrometry (ID-ICP-MS). The analytical uncertainty of Xref, uchar, was calculated according to the ISO Guide to the Expression of Uncertainty in Measurement (GUM)2. The assigned value for total As was provided by the Studiecentrum voor Kernenergie (SCK-CEN) using neutron activation analysis. The analytical uncertainty of Xref, uchar, for total As was calculated according to GUM3. Homogeneity and stability studies were subcontracted to Bayer Antwerpen. The uncertainties of the respective assigned values, uref, were calculated combining the analytical uncertainty, uchar, with a contribution for the between-bottle homogeneity, ubb, and for the short term stability of the test material, usts. Participants were invited to report the uncertainty of their measurements. This was done by 17 laboratories for extractable Pb and Cd and by 18 laboratories for total As, Cd and Pb. The laboratory performance was evaluated using z and zeta scores in accordance with ISO 13528 4. The standard deviations for proficiency assessment (also called target standard deviation) were calculated using the modified Horwitz equation5 and were between 15 and 16 % for all the measurandsJRC.D.4-Isotope measurement

    Report of the Sixth Interlaboratory Comparison Organised by the Community Reference Laboratory for Heavy Metals in Feed and Food - Total Cd, Pb, As and Hg in Food Supplements

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    The Institute for Reference Materials and Measurements (IRMM) of the Joint Research Centre (JRC), a Directorate-General of the European Commission, operates the Community Reference Laboratory for Heavy Metals in Feed and Food (CRL-HM). One of its core tasks is to organise interlaboratory comparisons (ILCs) among appointed National Reference Laboratories (NRLs). This report presents the results of the sixth ILC of the CRL-HM which focused on the determination of total Cd, Pb, As and Hg, (related to dry mass) in food supplements. The test material used in this exercise was the candidate standard reference material (SRM) SRM 3256, of the National Institute of Standards and Technology (NIST), the matrix being green tea of Chinese origin. The material was labelled at IRMM and dispatched to the participants the first week of June 2009. Each participant received two sachets containing approximately 2.5 g of test material each. Thirty-three participants from twenty-five countries registered to the exercise of which 32 sets of results were reported for total Cd and for total Pb, and 29 for total As and for total Hg. One laboratory reported two sets of values for total Cd, Pb, As and Hg obtained with two different techniques, respectively. The assigned values were the certified values as provided by NIST. The uncertainties of the respective assigned values, uref, were also provided by NIST. Participants were invited to report the uncertainty on their measurements. This was done by the majority of laboratories taking part in this exercise. Laboratory results were rated with z and zeta scores in accordance with ISO 135281. Standard deviation for proficiency assessment (also called target standard deviation) was fixed to 15 % for total Cd, Pb and As by the advisory board of this ILC, on the basis of the outcome of previous ILC's organised by the CRL-HM for the same population. For total Hg the standard deviation for proficiency assessment was set to 22 % as derived by the modified Horwitz equation2.JRC.D.8-Food safety and qualit
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