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    Wyświetlanie 1-11 z 11
    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:
    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:
    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:
    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
    Tytuł:
    Gamma irradiation used on adult Tetranychus urticae Koch as a quarantine treatment
    Autorzy:
    Osouli, S.
    Nejad, K.H.I.
    Ziaie, F.
    Moghaddam, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/65503.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gamma-irradiation
    adult
    Tetranychus urticae
    quarantine treatment
    sterility
    Opis:
    The effect of gamma radiation with 0, 200, 250, 300, 350, 400, and 450 Gy intensities on the longevity, total number of eggs, and the percent of hatched eggs laid by irradiated females of Tetranychus urticae Koch (Tetranychidae) was evaluated. Two different groups (0–24 h old and 48–72 h old) of adult females were irradiated. The results showed that 350 and 300 Gy doses significantly reduced the longevity of the 0–24 h old females and the 48–72 h old females. The younger females were more tolerant at lower dose rates than the older females. There was a quadratic relationship between dose rates and young females, while it was linear in older females. The total number of eggs laid by females of both ages was significantly reduced with a linear trend by 250 Gy irradiation. The eggs laid by females of both the 0–24 h olds and the 48–72 h olds lost their hatchability when the dose rate was 350 Gy. It was concluded, that applying a dose rate of 320 Gy on one of the mates (male or female) before mating, or a 300 Gy on both of them, would be sufficient to cause sterility in adult mites.
    Źródło:
    Journal of Plant Protection Research; 2014, 54, 2
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    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:
    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:
    Investigation on polycarbonate nanomembrane production based on alpha particles irradiation
    Autorzy:
    Ziaie, F.
    Shadman, M.
    Yeganegi, S.
    Mollaie, A.
    Majdabadi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/148096.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    track-etched membrane
    micro/nanofilter
    alpha particles
    chemical etching
    polycarbonate
    Opis:
    Track-etched membranes were prepared in the Dosimetry Laboratory of Agricultural, Medical and Industrial Research School by exposing polycarbonate (PC) films with a thickness of about 20 μm to alpha particles emitted from 241Am followed by chemical etching in sodium hydroxide (NaOH) at different temperatures and solution concentrations. The PC films were prepared using the method of chemical solving, forming and drying in a vacuum oven. The etching rate of PC was related to the concentration of etching solution, etching temperature and time. Therefore, a series of track-etched membranes were produced using different etching parameters. The relation between the etching rate and the etching parameters were established from experimental data and can be used to control the average pore sizes of the PC track-etched membrane. The pore sizes and their structures were studied by an optical microscope (OM) and a scanning electron microscope (SEM) and the obtained results indicated that the pores across the PC films are cylindrically shaped.
    Źródło:
    Nukleonika; 2009, 54, 3; 157-161
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Manufacturing of a graphite calorimeter at Yazd Radiation Processing Center
    Autorzy:
    Ziaie, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/147318.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    graphite calorimeters
    absorbed dose
    radiation processing
    self designed calorimeters (SDC)
    standard calorimeter
    Opis:
    In this work, a few quasi-adiabatic graphite calorimeters of different dimensions are described. These calorimeters have been manufactured by ourselves and studied for accurate absorbed dose measurements in 10 MeV electron beam. In order to prove the accuracy and reliability of dose measurements with the use of the self designed graphite calorimeters (SDC), an inter comparison study was performed on these calorimeters and RisŘ's graphite calorimeters (SC, standard calorimeter) at different doses by using a Rhodotron accelerator. The comparison shows conclusively SDC of the optimal size, the results agreeing with those obtained with the SC within 1%.
    Źródło:
    Nukleonika; 2004, 49, 4; 159-162
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mass throughput rate calculation for X-ray facilities
    Autorzy:
    Ziaie, F.
    Tahami, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/148864.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    bremsstrahlung
    dose uniformity
    radiation processing
    dynamic mode
    mass throughput rate
    conversion
    Opis:
    Abstract In this work, the mass throughput rate in a radiation processing center, equipped with an X-ray facility, is calculated by means of a curve against the thickness of the material, along with the variation of dose uniformity. Therefore, depending on the desired dose value, the best thickness and the mass throughput rate can be calculated. The calculation results for the 5 and 10 MeV X-ray bremsstrahlung for polyethylene and wood as the irradiation products, have been obtained by using a Monte-Carlo computer code. In addition, the experimental results at the same geometry and materials were compared with those calculated.
    Źródło:
    Nukleonika; 2005, 50, 3; 121-124
    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
      Wyświetlanie 1-11 z 11

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