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    Wyświetlanie 1-3 z 3
    Tytuł:
    Self-absorption correction and efficiency calibration for radioactivity measurement of environmental samples by gamma-ray spectrometry
    Autorzy:
    Misiak, R.
    Hajduk, R.
    Stobiński, M.
    Bartyzel, M.
    Szarłowicz, K.
    Kubica, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/147063.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    gamma spectrometry
    efficiency calibration
    self-absorption
    environmental
    Opis:
    In this work empirical functions which relate the full-energy peak efficiency with sample height, energy, matrix composition and bulk density for voluminal samples in a cylindrical counting geometry were found. Accurate determination of the radioactivity of gamma-emitting radionuclides in environmental samples requires taking into account self-absorption. For the obtained self-absorption correction factor, a direct transmission method was chosen. Finally, this paper proposes a simple correlation between the self-absorption correction factor and the bulk density and height of the measured sample for a given energy.
    Źródło:
    Nukleonika; 2011, 56, 1; 23-28
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of the new Monte Carlo code AlfaMC to the calibration of alpha-particle sources
    Autorzy:
    Jurado Vargas, M.
    Fernández Timón, A.
    García Orellana, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/148497.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    alpha-particle spectrometry
    code AlfaMC
    Monte Carlo simulation
    scattering and self-absorption
    Opis:
    Measurements of α-particle sources require corrections to the counting rate due to scattering and self- -absorption in the source and the backing material. In this study, we describe a simple procedure to estimate these corrections using the new Monte Carlo code AlfaMC to consider the effects of scattering and self-absorption conjointly, and so to determine the activity of α emitters. The procedure proposed was applied to 235UO2 sources deposited on highly polished platinum backings. In general, the dependence of the efficiency with source thickness was in good agreement with a simple model considering a linear and a hyperbolic behavior for thin and thick sources, respectively, although significant deviations from this model were found for very thin sources. For these very thin sources, the Monte Carlo simulation revealed to be as a required method in the primary calibration of α-particle sources. The efficiency results obtained by simulation with AlfaMC were in agreement with available efficiency data.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 2; 651-655
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Precise determination of HPGe detector efficiency for gamma spectrometry measurements of environmental samples with variable geometry and density
    Autorzy:
    Barrera, M.
    Casas-Ruiz, M.
    Alonso, J. J.
    Vidal, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146350.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    efficiency calibration
    environmental radioactivity
    gamma spectrometry
    geometric dependence of the efficiency
    self-attenuation corrections
    Opis:
    A methodology to determine the full energy peak efficiency (FEPE) for precise gamma spectrometry measurements of environmental samples with high-purity germanium (HPGe) detector, valid when this efficiency depends on the energy of the radiation E, the height of the cylindrical sample H, and its density ρ is introduced. The methodology consists of an initial calibration as a function of E and H and the application of a self-attenuation factor, depending on the density of the sample ρ, in order to correct for the different attenuation of the generic sample in relation to the measured standard. The obtained efficiency can be used in the whole range of interest studied, E = 120–2000 keV, H = 1–5 cm, and ρ = 0.8–1.7 g/cm3, being its uncertainty below 5%. The efficiency has been checked by the measurement of standards, resulting in a good agreement between experimental and expected activities. The described methodology can be extended to similar situations when samples show geometric and compaction differences.
    Źródło:
    Nukleonika; 2017, 62, 1; 47-59
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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