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    Wyświetlanie 1-4 z 4
    Tytuł:
    Calculated neutron energy dependence of the dose-response of large recombination chamber
    Autorzy:
    Tymińska, Katarzyna
    Gryziński, Michał A.
    Maciak, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/146700.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    ambient absorbed dose
    Monte Carlo
    recombination chamber
    Opis:
    A model of REM-2-type chamber was modeled with MCNPX code to study the dose-response to monoenergetic neutrons in wide energy range from thermal to 20 MeV for various compositions of gas in the chamber. The energy dependence of the total dose absorbed in the fi lling gas was compared with the energy dependence of ambient absorbed dose D*(10) and with experimental data. The results of the studies will be useful for designing new, improved generation of recombination chambers.
    Źródło:
    Nukleonika; 2019, 64, 4; 117-121
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metrological features of a beta absorption particulate air monitor operating with wireless communication system
    Autorzy:
    Jakowiuk, A.
    Urbański, P.
    Świstowski, E.
    Machaj, B.
    Pieńkos, J.
    Kowalska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/146846.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    ambient air
    beta-ray absorption
    particulate matter
    wireless communication
    Opis:
    A system for measurements of particulate matter in the ambient air, employing beta absorption instrument AMIZ-2007 with wireless communication facilities based on GPRS technology, is presented. Uncertainty of measurements caused by the counting statistics was analyzed and it was found that at least 3 h of sampling time is needed to achieve coefficient of variation lower than 20% for the average concentration of particulate matter in the ambient air exceeding 10 μg/m3. Application of a C-14 beta ray source instead of Pm-147 improves sensitivity of the measurement ca. two times. Some results of on-line operation of the system with PM10 and PM2.5 samplers are also shown.
    Źródło:
    Nukleonika; 2008, 53, suppl. 2; 37-42
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deconvolution of alpha spectra from air filters applied for measurements of the short-lived radon progeny concentration
    Autorzy:
    Skubacz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/148906.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    alpha spectroscopy
    ambient pressure
    spectrum analysis
    non-linear regression
    radon progeny
    thoron progeny
    Opis:
    The paper contains a description of a method for the analysis of the complex alpha spectra generated during the measurement of the activity of filters outside of a vacuum chamber under environmental conditions. The peaks corresponding to the energies of alpha particles emitted by the specific isotopes are particularly large on the low-energy side of the peak maximum, and the energy resolution strongly depended on the applied filters. The analysis was based on the non-linear regression to a function designed for four, six and eight parameters. Satisfactory results were obtained for each of these functions, and the best-fitting results were achieved for the eight-parameter function. In addition, the uncertainties related to the estimated parameters, as well as the signals corresponding to functions that describe the shape of the energy peak, have been evaluated. There are also examples of the implementation of the method with respect to short-lived radon progeny and thoron decay products.
    Źródło:
    Nukleonika; 2017, 62, 3; 229-234
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    214Bi/214Pb radioactivity ratio three-year monitoring in rainwater in Prague
    Autorzy:
    Ambrosino, Fabrizio
    Thinová, Lenka
    Hýža, Miroslav
    Sabbarese, Carlo
    Powiązania:
    https://bibliotekanauki.pl/articles/148739.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    214Bi/214Pb gamma-ray ratio
    ambient dose equivalent rate
    hybrid method
    rainfall
    time-series analysis
    Opis:
    Continuous monitoring of natural gamma radiation in air has been carried out, during December 2014 – January 2018, with 1-min cyclic measurement in Prague, Czech Republic using a NaI(Tl) probe. The 214Bi/214Pb ratio as a tracer in rainwater has been investigated to study its variations related to both the ambient dose equivalent rate per hour and the amount of rainfall. A hybrid methodology for time series analysis, composed of the aggregation of two signal decomposition methods (multiple linear regression and empirical mode decomposition) and one forecasting method (support vector regression), has been applied to identify the anomalies in the studied signals in order to better find correlations among them. The results show a strong correlation between the ambient dose equivalent rate and the 214Bi/214Pb ratio values and between both these signals and rainfall amount≥5 mm/h. Furthermore, the considered descendants of radon are mainly responsible for the overall ambient dose equivalent rate.
    Źródło:
    Nukleonika; 2020, 65, 2; 115-119
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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