A: Nanowires, due to their special physical properties and also high surface to volume ratio, can have considerable applications in designing and development of novel nanodevices. For the radiation shielding, higher absorption coefficient of nanostructures in comparison to bulk ones is an advantage. In gas detectors, designing a proper converter that absorbs higher energy of gamma and X-rays and convert it to more free electrons is one of the major problems. Since the nanowires have higher surface to volume ratio in comparison to the bulk one, so it is expected that by optimizing the thickness, the generated electrons can have higher chance to escape from the surface. In this work, the random CuO nanowires with diameter of 40 nm are deposited on thin glass slide. This nanostructure with different thicknesses are tested by plastic and CsI scintillators by X-ray tube with HVs in the range of 16 to 25 kV. The results show that for the same thickness, the CuO nanowires can release electrons six times more than the bulk ones and for the same energy the optimum QE of nanoconverter can be three times greater than the bulk converter. This novel nanoconverter with higher detection efficiency can have applications in high energy physics, medical imaging and also astronomy.
K: Interaction of radiation with matter; Materials for gaseous detectors; X-ray detectors; Detector modelling and simulations I (interaction of radiation with matter, interaction of photons with matter, interaction of hadrons with matter, etc) 1Corresponding author.
A: Resistive Plate Chambers (RPC) have attracted a lot of research attention since past two decades due to their special features and properties especially for high energy physics applications. In this paper its capability to be used for medical imaging applications is studied. The main focus of this paper is on the gamma detection efficiency and energy resolution of this detector for common medical imaging modalities. The gamma to electron converter material and its thickness for a multilayer converter configuration is optimized to improve the detection efficiency. Simulation results show that 200 µm thickness of Borosilicate glass resistive plate can suppress the scattered photons. Therefor it can distinguish the primary and scattered photons for PET imaging with good detection efficiency for the primaries. By using 50 layers of RPCs with 30-50 µm thickness of lead converters and 200 µm thickness of borosilicate glasses as resistive plates of RPCs, not only for 511 keV gamma, the detection efficiency of 15% can be achieved, but also the related signals of scatterd gammas at 425 keV and 325 keV energies in comparison to 511 keV are reduced 30% and 65%, respectively. The 2 µm and 10 µm thicknesses of Lead are also introduced as high detection efficiency converter material for CT and SPECT scans, respectively.
K: Detector modelling and simulations I (interaction of radiation with matter, interaction of photons with matter, interaction of hadrons with matter, etc); Gamma camera, SPECT, PET PET/CT, coronary CT angiography (CTA); Gaseous detectors; Resistive-plate chambers 1Corresponding author.
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