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    Wyświetlanie 1-7 z 7
    Tytuł:
    Bone powder as EPR dosimetry system for electron and gamma radiation
    Autorzy:
    Ziaie, F.
    Hajiloo, N.
    Fathollahi, H.
    Mehtieva, S. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/148156.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    bone powder dosimeter
    EPR response
    dose rate
    electron beam
    gamma ray
    Opis:
    In this work bovine bone powder samples were irradiated at three different dose rates of 100, 260 and 630 kGy/min for the absorbed dose range of 3 to 110 kGy, using 10 MeV electron beam radiation. The samples were subjected to EPR measurement at room temperature in air. The variation of EPR signal intensities were constructed and evaluated base on quantitative data related to the absorbed doses. Moreover, they were compared with the obtained results from the samples irradiated by a 60Co gamma-ray source with a dose rate of 2.65 kGy/h. The time and temperature effects on the EPR response of this dosimeter were also studied. The results indicated that the bone sample was a suitable dosimeter especially for electron beam at high doses.
    Źródło:
    Nukleonika; 2009, 54, 4; 267-270
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability study of free radicals in 10 MeV electron beam irradiated quartz as an EPR dosimetry method
    Autorzy:
    Ziaie, F.
    Mohammadzadeh, A.
    Modarresi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/148163.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    quartz dosimeter
    EPR response
    dose rate
    electron beam
    EPR signal stability
    Opis:
    In this work the stability of free radicals induced by a 10 MeV electron beam in quartz samples was studied. The investigations have been done for different doses and different dose rates. For this reason, quartz samples in powder form were irradiated at different dose rates, i.e. 100, 260 and 630 kGy/min for absorbed dose range of similar to 5–80 kGy using the 10 MeV electron beam radiation. The dose values were validated using a polystyrene calorimeter system as a reference standard dosimetry system. The EPR optimum system parameters were defined and EPR responses at room temperature in air were measured and compared. The EPR signal, which is due to the free radicals induced by electron beam, was also investigated at different time intervals to check its stability. The main objective of this work was to study the feasibility of using quartz as a dosimeter. Thus, the variation of EPR signal intensities with the absorbed dose values were evaluated and plotted in a graph. The results show that the variation of dose rate, do not affect considerably the EPR response.
    Źródło:
    Nukleonika; 2009, 54, 4; 251-254
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dose rate effect on LDPE cross-linking induced by electron beam irradiation
    Autorzy:
    Ziaie, F.
    Anvari, F.
    Ghaffari, M.
    Borhani, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/148862.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dose rate
    electron beam
    low-density polyethylene
    cross-linking
    chain scission
    Opis:
    In this project, the radiation induced cross-linking in low-density polyethylene (LDPE) samples irradiated with the different dose rates of 5 MeV electron beam in the dose range of 20 up to 200 kGy were investigated and compared. The dose rate values were ranged from 13 to 300 kGy/min. The cross-linking of the samples were studied on the basis of gel content measurement and a hot set test. The yield of gel content showed slight increases with decreasing dose rate values. The same results were more clearly observed using the hot set test. It was concluded that, to irradiate the product based on LDPE, any variation in electron beam current causes different dose rates which, in turn, affect the absorbed dose value in materials.
    Źródło:
    Nukleonika; 2005, 50, 3; 125-127
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of temperature on breakdown voltage of 10 MeV electron beam irradiated LDPE and HDPE
    Autorzy:
    Borhani, M.
    Ziaie, F.
    Bolorizadeh, M.
    Mirjalili, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/146157.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    breakdown voltage
    dielectric constant
    temperature effect
    electron beam
    low-density polyethylene
    Opis:
    The paper presents measurements of the breakdown (dielectric strength) and dielectric constant of the low density polyethylene (LDPE) and high density polyethylene (HDPE) thin sheets, which were irradiated with a 10 MeV electron beam in the range of 0-470 kGy using a Rhodotron accelerator system. The tests were performed at temperatures ranging from 20°C to 110°C. Variation of the measured parameters vs. radiation absorbed dose and temperature were discussed.
    Źródło:
    Nukleonika; 2006, 51, 3; 179-182
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of additives on thermal properties of electron beam irradiated LDPE foam
    Autorzy:
    Ghaffari, E.
    Ziaie, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/148260.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    polyethylene foam
    10 MeV electron beam
    crosslinking
    thermal properties
    multifunctional monomer
    activator
    Opis:
    In this work, the effects of some additives such as TMPTMA, a multifunctional monomer, and ZnO as the activator on thermal properties of electron beam irradiated LDPE foam were investigated. LDPE foams were made via adding 5 phr of azodicarbonamide as the blowing agent (ACA), 1-5 phr of ZnO and 1-5 phr of TMPTMA to the low-density polyethylene (LDPE) and then cross-linked using the 10 MeV electron beam at the dose range of 20 to 100 kGy. Effects of activator, multifunctional monomer and irradiation on thermal properties such as melting and degradation temperatures in cross-linked polyethylene foam were investigated. The thermal properties were measured by differential scanning calorimetry system (DSC).
    Źródło:
    Nukleonika; 2007, 52, 1; 35-38
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of high-dose irradiation effects on polystyrene calorimeter response
    Autorzy:
    Ziaie, F.
    Noori, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/146133.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    polystyrene calorimeter
    electron beam
    absorbed dose
    high dose
    high impact polystyrene (HIPS)
    Opis:
    In this work attempts have been made to investigate the variation of polystyrene calorimeter response after frequent irradiations with an electron beam. Polystyrene calorimeters are routinely used in every radiation processing center as a traceable to NPL primary standard dosimeter. Thus, self designed high impact polystyrene as the calorimeter core was irradiated several times up to many thousands of kGy doses. After each irradiation, the specific heat capacity of the polystyrene as the main changeable parameter was measured using the differential scanning calorimeter system (DSC) in the practical temperature range of polystyrene calorimeter. Therefore, correction factors to calculate the precise absorbed dose were obtained. At the final stage, several these calorimeters were irradiated simultaneously along with two Risoe standard calorimeters and another correction factor for each tested calorimeter was calculated.
    Źródło:
    Nukleonika; 2006, 51, 3; 175-178
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical properties of EVA/LDPE blends irradiated by high energy electron beam
    Autorzy:
    Borhani, M.
    Mirjalili, G.
    Ziaie, F.
    Bolorizadeh, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146572.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    EVA/LDPE blends
    electrical properties
    surface resistances
    permittivity (dielectric constant)
    loss factor
    high energy electron beam
    Opis:
    A series of low-density polyethylene (LDPE) blends with different amounts of poly(ethylene-vinyl acetate) (EVA) was prepared and irradiated with 10 MeV electron beam in the range of 50-380 kGy at room temperature in air. Some electrical properties of the blends such as surface and volume resistance, breakdown voltage, permittivity and loss factor were studied as a function of the EVA content and the radiation dose. It was revealed that the surface resistance and volume resistivity of the blends reach a maximum at a 170 kGy dose of radiation and 30 wt% of EVA. There is no considerable change at breakdown voltage permittivity and loss factor of the irradiated samples; however, the permittivity and the loss factor of the blends increase significantly with increasing amount of EVA contents.
    Źródło:
    Nukleonika; 2007, 52, 2; 77-81
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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