عظیمی راد, روح اله
دانشگاه صنعتی مالک اشتر
[ 1 ] - سنتز و مشخصه‌یابی نانوپودر سوسوزن کادمیم تنگستات بر پایه استات و نیترات و مقایسه ویژگی آنها به عنوان شمارشگر ذرات آلفا
Cadmium tungstate nano powder (CdWO4) was synthesized with co-precipitation method. Two different types of material (based on acetate and nitrate) were used as precursors. The synthesized powder was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Fourier transfer Infrared absorption (FTIR) spectrum, and photoluminescent (PL) spectrum. According to the X...
[ 2 ] - دزیمتری یک سیستم بازرسی کانتینرها با پرتوهای فوتونی دوانرژی با شبیه سازی مونت‌کارلو
Todays, X-ray imaging system for cargo and containers inspecting of country gates are highly regarded. The dual energy imaging system due to the use of two beams with different spectrums can extracts more information about the materials in cargo than the conventional X-ray imaging system. Since the X-ray beam is an ionizing radiation, three parameters should be taken into account including just...
[ 3 ] - Fabrication of an alpha particle counter: spin coated films of synthesized nanocrystalline cadmium tungstate powder
Background: CdWO4 is a scintillator with some unique properties. For example, high density, thermal and chemical stability and so on. Different applications of this scintillator such as X-ray scintillator has been investigated thoroughly so far. However, there is limited number of studies reporting the characteristics of CdWO4 as an alpha counter. Materials and Methods: The CdWO4 powder was syn...
[ 4 ] - بهبود عملکرد حسگر گازی نانومیله های اکسیدروی کپسوله شده با یک لایه اکسیدروی آلاییده با ناخالصی کروم در برابر بخار اتانول
In this study, encapsulated ZnO nanorods with different amount of chromium (Cr) dopant (0-4.5 at.%) were prepared with hydrothermal method, and their sensitivities as gas sensors against ethanol vapor were investigated. Morphologies of samples were explored by field emission scanning electron microscope (FESEM) which showed that encapsulation process increased the diameter of ZnO nanorods. Exis...
[ 5 ] - Effect of hydrothermal reaction temperature on the photocatalytic properties of CdWO4-RGO nanocomposites
Cadmium tungstate (CdWO4) nanorods and CdWO4-reduced graphene oxide (RGO) nanocomposites have been prepared by the hydrothermal method at 140, 160 and 180 oC reaction temperatures. The synthesized samples were characterized by X-ray powder diffraction, scanning electron microscopy (SEM), Fourier transform infrared, photoluminescence spectroscopy and Raman spectroscopy. SEM image showed the pure...
[ 6 ] - Optical simulation and experimental measurement of gamma ray energy spectrum of plastic scintillators with different sizes
The application of large plastic scintillators is widely increasing in the different areas of industry, medicine and security due to technical and economic advantages. One of the main disadvantages of these detectors is the unknown position of Compton edge at gamma ray spectrum. In this research, GEANT4/GATE code has been used to simulate the gamma ray spectrum for different volumes of large pl...