Interlaboratory comparison on 137Cs activity concentration in fume dust

Proceeding of the 9th International Topical Meeting on Industrial Radiation and Radioisotope Measurement Applications, 6-7 July 2014, Valencia, Spain.; International audience; A comparison was conducted, between 11 European National Metrology Institutes and EC-JRC, on measurement of Cs-137 activity concentration in fume dust. As test material an activity standard produced from real contaminated fume dust was used. The standard material consisted of 13 cylindrical samples of compressed fume dust. The material contained Cs-137 and Co-60 of reference activity concentrations of (9.72 +/- 0.10) Bq/g and (0.450 +/- 0.018) Bq/g, respectively, for the reference date of 1 June 2013, determined using the comparison results. The organization and results of the intercomparison, as well as the process of obtaining reliable reference values are presented

60Co in Cast Steel Matrix: a European Interlaboratory Comparison for the Characterisation of New Activity Standards for Calibration of Gamma-ray Spectrometers in Metallurgy

International audience; Two series of activity standards of Co-60 in cast steel matrix, developed for the calibration of gamma-ray spectrometry systems in the metallurgical sector, were characterised using a European interlaboratory comparison among twelve National Metrology Institutes and one international organisation. The first standard, consisting of 14 disc shaped samples, was cast from steel contaminated during production ("originally"), and the second, consisting of 15 similar discs, from artificially-contaminated ("spiked") steel. The reference activity concentrations of Co-60 in the cast steel standards were (1.077 +/- 0.019) Bq g(-1) on 1 January 2013 12h00 UT and (1.483 +/- 0.022) Bq g(-1) on 1 June 2013 12h00 UT, respectively

Nature of Mixed-Symmetry 2+ States in 94Mo from High-Resolution Electron and Proton Scattering and Line Shape of the First Excited 1/2+ State in 9Be

The present work contains two parts. The first one is devoted to the investigation of mixed-symmetry structure in 94Mo and the second one to the astrophysical relevant line shape of the first excited 1/2+ state in 9Be. In the first part of the thesis the nature of one- and two-phonon symmetric and mixed-symmetric 2+ states in 94Mo is investigated with high-resolution inelastic electron and proton scattering experiments in a combined analysis. The (e,e′) experiments were carried out at the 169° magnetic spectrometer at the S-DALINAC. Data were taken at a beam energy Ee = 70 MeV and scattering angles Θe = 93° - 165°. In dispersion-matching mode an energy resolution ΔE = 30 - 45 keV (full width at half maximum) was achieved. The (p,p′) measurements were performed at iThemba LABS, South Africa, using a K600 magnetic spectrometer at a proton energy Ep = 200 MeV and scattering angles Θp = 4.5° - 26°. Typical energy resolutions were ΔE ≈ 35 keV. The data are compared to calculations in the quasiparticle-phonon model, shell model and interacting boson model with proton-neutron degrees of freedom. The combined analysis reveals a dominant one-phonon structure of the transitions to the first and third 2+ states, as well as an isovector character of the transition to the one-phonon mixed-symmetric state within the valence shell by the different momentum-transfer dependence in electron and proton scattering and the analysis of the microscopic wave functions. Excitation of the two-phonon states is sensitive to admixtures of one-phonon components, which are found to be small. Quantitatively consistent estimates of the one-phonon admixtures are obtained from both experimental probes when two-step contributions to the proton scattering cross sections are taken into account.In the second part of the thesis the line shape of the first excited 1/2+ state in 9Be is studied. Spectra of the in 9Be(e,e′) reaction were measured at the S-DALINAC at an electron energy Ee = 73 MeV and scattering angles of 93° and 141° with high energy resolution up to excitation energies Ex = 8 MeV. The form factor of the first excited state has been extracted from the data. The momentum transfer dependence of its form factor is well reproduced by the modern no-core shell model calculations. The astrophysical relevant 9Be(γ,n) cross sections have been extracted from the (e,e′) data. The resonance parameters of the first excited 1/2+ state in 9Be are derived in a one-level R-matrix approximation. The deduced resonance parameters averaged over all available (e,e′) data are ER = 1.748(6) MeV and ΓR = 274(8) keV in agreement with the latest direct (γ,n) experiment. However, the extracted B(E1) strength is a factor of two smaller than found in the latter indicating a violation of Siegert′s theorem at the photon point

Problems of criminal law protection of the national security of the state against subversive acts

The purpose of the article is to study the main problematic aspects of the regulation of liability for sabotage in the legislation of Ukraine. The subject of the research is the problematic aspects of the regulation of criminal liability for sabotage under the laws of Ukraine. In order to obtain reliable results, a number of methods are applied: dialectical, formal-logical, hermeneutic, logical-semantic, statistical, comparative-legal, etc. The results of the conducted research: modern threats to the national security of any state require effective measures of counteraction, including the qualitative criminal legislation. The main shortcomings of the regulation of liability for sabotage under the laws of Ukraine are due to the imperfection of the components of this criminal offense, as well as the misinterpretation of its provisions by the enforcer. In addition, it is determined that one of the important problems of liability for such action is the parallel existence of a terrorist act in the criminal legislation of Ukraine, and the components of a terrorist act by its content and nature in most cases coincides with the components of sabotage. A number of changes and additions to the criminal legislation of Ukraine on elimination of the specified problems are proposed