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Träfflista för sökning "WFRF:(Michalik D.) srt2:(2005-2009)"

Sökning: WFRF:(Michalik D.) > (2005-2009)

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1.
  • Pham, M. K., et al. (författare)
  • A new Certified Reference Material for radionuclides in Irish sea sediment (IAEA-385)
  • 2008
  • Ingår i: APPLIED RADIATION AND ISOTOPES. - : Elsevier BV. - 1872-9800 .- 0969-8043. ; 66:11, s. 1711-1717
  • Konferensbidrag (refereegranskat)abstract
    • A new Certified Reference Material (CRM) for radionuclides in sediment (IAEA-385) is described and the results of the certification process are presented. Eleven radionuclides (K-40, Cs-137, Ra-226, Ra-228, Th-230, Th-232, U-234, U-238, Pu-238, Pu239+240 and Am-241) have been certified and information mass activities with 95% confidence intervals are given for seven other radionuclides (Sr-90, Pb-210(Po-210), U-235, Pu-239, Pu-240 and Pu-241). Results for less frequently reported radionuclides (Co-60, Tc-99, Cs-134, Eu-155, Ra-224 and Np-239) and information on some activity and mass ratios are also reported. The CRM can be used for quality assurance/quality control of the analysis of radionuclides in sediment samples, for the development and validation of analytical methods and for training purposes. (C) 2008 IAEA. Published by Elsevier Ltd. All rights reserved.
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2.
  • Danilczuk, M., et al. (författare)
  • EPR and DFT study on the stabilization of radiation-generated methyl radicals in dehydrated Na-A zeolite
  • 2006
  • Ingår i: Journal of Physical Chemistry B. - : American Chemical Society (ACS). - 1520-6106 .- 1520-5207. ; 110:48, s. 24492-24497
  • Tidskriftsartikel (refereegranskat)abstract
    • Electron paramagnetic resonance (EPR) spectroscopy was applied to study paramagnetic species stabilized in Na-A zeolite exposed to gaseous methane and ?-irradiated at 77 K. Two types of EPR spectra were recorded during thermal annealing of zeolite up to room temperature. Owing to the results for the zeolite exposed to 13CH4 the multiplet observed at 110 K was assigned to a ?CH3?Na+ complex. After decay of the multiplet, the isotropic quartet of methyl radical was recorded in the temperature range of 170-280 K. On the basis of the EPR parameters it is postulated that ?CH3 radicals in this temperature region are able to freely rotate inside the zeolite cage. The structures of the ?CH3?Na+ adsorption complex and respective hyperfine coupling constants were calculated by applying DFT quantum chemical methods. Two different models were applied to represent the zeolite framework: the 6T structure of one six-membered ring and the 3T cluster. The hyperfine coupling constants calculated for the ?CH3?Na+ adsorption complex for both applied models show very good agreement with those obtained experimentally. © 2006 American Chemical Society.
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