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    Wyświetlanie 1-6 z 6
    Tytuł:
    Ambient dose equivalent measurements in secondary radiation fi elds at proton therapy facility CCB IFJ PAN in Krakow using recombination chambers
    Autorzy:
    Jakubowska, E. A.
    Gryziński, M. A.
    Golnik, N.
    Tulik, P.
    Stolarczyk, L.
    Horwacik, T.
    Zbroja, K.
    Góra, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/147396.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    recombination chambers
    workplace monitoring
    proton therapy
    Opis:
    This work presents recombination methods used for secondary radiation measurements at the Facility for Proton Radiotherapy of Eye Cancer at the Institute for Nuclear Physics, IFJ, in Krakow (Poland). The measurements of H*(10) were performed, with REM-2 tissue equivalent chamber in two halls of cyclotrons AIC-144 and Proteus C-235 and in the corridors close to treatment rooms. The measurements were completed by determination of gamma radiation component, using a hydrogen-free recombination chamber. The results were compared with the measurements using rem meter types FHT 762 (WENDI-II) and NM2 FHT 192 gamma probe and with stationary dosimetric system.
    Źródło:
    Nukleonika; 2016, 61, 1; 23-28
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved dosimetry for BNCT by activation foils, modified thermoluminescent detectors and recombination chambers
    Autorzy:
    Bilski, P.
    Golnik, N.
    Olko, P.
    Pytel, K.
    Tracz, G.
    Tulik, P.
    Zielczyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/971519.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    BNCT
    recombination chambers
    TLD
    activation foils
    Opis:
    Boron neutron capture therapy (BNCT) is an experimental therapy of selected tumours, based on a nuclear reaction initiated by the capture of thermal neutron by the 10B nucleus. After 10B had been delivered selectively to tumour cells, it can be activated by neutrons to deliver locally lethal high-LET radiation. BNCT beams are complex mixed radiation fields, because of broad neutron energy range, presence of gamma contamination and necessity of precise determination of several dose components. The paper presents
    Źródło:
    Nukleonika; 2004, 49, 2; 51-56
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the role of LET-dependent parameters in the determination of the absorbed dose by in-phantom recombination chambers
    Autorzy:
    Golnik, N.
    Maciak, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/146876.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    in-phantom recombination chambers
    absorbed dose
    cavity theory
    Opis:
    The paper discusses the theoretical background in terms of the use of in-phantom recombination chambers in mixed radiation fi elds, with special attention paid to the question of how the experimentally determined, linear-energy-transfer-dependent (LET) parameters can be applied with regard to the more accurate determination of the chamber response and absorbed dose in mixed radiation fi elds. Methods of taking the recombination index of radiation quality (RIQ) measurements and theoretical consideration concerning the determination of the absorbed dose are described. Classical Bragg-Gray and Spencer-Attix cavity theories were analysed and their relationship to in-phantom recombination chambers was specifi ed. Methods concerning the estimation of correction factors with regard to RIQ measurements and their importance are highlighted.
    Źródło:
    Nukleonika; 2018, 63, 1; 9-15
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Initial recombination of ions in ionization chambers filled with hydrocarbon gases
    Autorzy:
    Gryziński, M.
    Golnik, N.
    Zielczyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/148268.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    initial recombination
    ionization chambers
    Opis:
    Data on the initial recombination of ions are needed for designing recombination chambers, used in mixed radiation dosimetry in order to obtain information about radiation quality. Nevertheless, experimental data for pressurized gases are scarce, whereas reliable theoretical models are absent. The paper provides experimental data on the initial recombination in hydrocarbon gases (methane, ethane and propane) depending on gas pressure up to 1.8 MPa. The data were derived from the measurements of saturation curves of a tissue equivalent recombination chamber of an REM-2 type, in reference radiation fields of 137Cs and 239Pu-Be sources. Ion recombination due to volume recombination and back diffusion of ions was subtracted from the measured values of ion collection efficiency. The values of gas parameters needed for the subtraction procedure were determined by measurements of saturation curves of the chamber at several dose rates for each gas pressure. The important practical rule resulting from the experiments is that in the first approximation the initial recombination does not depend on the kind of the hydrocarbon gas but only on its density in the chamber.
    Źródło:
    Nukleonika; 2007, 52, 1; 7-12
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of initial recombination of ions created in quasi-pulsed radiation fields
    Autorzy:
    Zielczyński, M.
    Golnik, N.
    Gryziński, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/146942.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    initial recombination
    volume recombination
    ionization chambers
    pulse radiation
    Opis:
    A new method is proposed for the determination of ion collection efficiency due to initial recombination process only, in a high pressure ionization chamber, operating in a quasi-pulsed radiation field. It is shown that the influence of undesirable volume recombination can be eliminated using a semi-empirical formula. The unknown function of the chamber polarizing voltage, included to the formula, can be found experimentally in the investigated radiation field, using the approach proposed in the paper. The function is the same for all radiation fields with similar time structure.
    Źródło:
    Nukleonika; 2008, 53, suppl. 2; 33-36
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Applications of recombination chambers in the dosimetry of high energy radiation fields
    Autorzy:
    Zielczyński, M.
    Golnik, M.
    Gryziński, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147680.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    initial recombination
    ionization chambers
    high energy radiation
    Opis:
    High energy radiation fields exist in space, in the atmosphere at the height of commercial flights and in the vicinity of some accelerators. The characteristic features of these fields are their complex composition and broad energy spectrum. Estimation of the absorbed dose in such fields cannot be performed by consideration of the doses from all the radiation field components. The physically possible way to solve the problem is to determine the operational quantity-ambient dose equivalent H* (10). The radiation detector used for the determination of H* (10) should be large enough in order to simulate the ICRU sphere. Its effective wall thickness should not be very different than 10 mm of tissue. The REM-2 type recombination chamber is an example of such a detector. The review paper presents specific challenges of high energy radiation field dosimetry and discusses a number of examples of measurements at high energy accelerators, including some international intercomparisons. We show that the REM-2 chamber is especially suitable for radiation monitoring in the vicinity of high energy accelerators.
    Źródło:
    Nukleonika; 2008, 53, suppl. 1; 45-52
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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