The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
Kyuseog Hwang - One of the best experts on this subject based on the ideXlab platform.
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photoluminescence of zno layer on Commercial Glass substrate prepared by sol gel process
Ceramics International, 2008Co-Authors: Seung Hwangbo, Kyuseog HwangAbstract:Abstract Amorphous ZnO thin film on soda–lime–silica Glass substrate was prepared by the sol–gel process at low-temperature processing, i.e., 100 °C. No distinct grain structure was observable in the surface of the film. The photoluminescence spectrum of the ZnO thin film with an intense near band edge emission was observed while the defect-related broad green emission was nearly quenched.
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Photoluminescence of ZnO layer on Commercial Glass substrate prepared by sol–gel process
Ceramics International, 2008Co-Authors: Seung Hwangbo, Kyuseog HwangAbstract:Abstract Amorphous ZnO thin film on soda–lime–silica Glass substrate was prepared by the sol–gel process at low-temperature processing, i.e., 100 °C. No distinct grain structure was observable in the surface of the film. The photoluminescence spectrum of the ZnO thin film with an intense near band edge emission was observed while the defect-related broad green emission was nearly quenched.
Seung Hwangbo - One of the best experts on this subject based on the ideXlab platform.
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photoluminescence of zno layer on Commercial Glass substrate prepared by sol gel process
Ceramics International, 2008Co-Authors: Seung Hwangbo, Kyuseog HwangAbstract:Abstract Amorphous ZnO thin film on soda–lime–silica Glass substrate was prepared by the sol–gel process at low-temperature processing, i.e., 100 °C. No distinct grain structure was observable in the surface of the film. The photoluminescence spectrum of the ZnO thin film with an intense near band edge emission was observed while the defect-related broad green emission was nearly quenched.
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Photoluminescence of ZnO layer on Commercial Glass substrate prepared by sol–gel process
Ceramics International, 2008Co-Authors: Seung Hwangbo, Kyuseog HwangAbstract:Abstract Amorphous ZnO thin film on soda–lime–silica Glass substrate was prepared by the sol–gel process at low-temperature processing, i.e., 100 °C. No distinct grain structure was observable in the surface of the film. The photoluminescence spectrum of the ZnO thin film with an intense near band edge emission was observed while the defect-related broad green emission was nearly quenched.
D A Bradley - One of the best experts on this subject based on the ideXlab platform.
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thermoluminescence features of Commercial Glass and retrospective accident dosimetry
Radiation Physics and Chemistry, 2020Co-Authors: Sabina Yasmin, Siti Z Rozaila, Mayeen Uddin Khandaker, D A Bradley, Abdur Rashid, S Abdul F SaniAbstract:Abstract Five window Glass brands popularly used in Bangladeshi dwellings have been analyzed for retrospective accident dosimetry, being inexpensive, highly effective as a barrier to moisture and naturally transparent at optical wavelengths. In examining their potential for dosimetry, study has been made of the annealing – irradiation - readout steps contributing to characterization of the various key thermoluminescence properties. These include the respective glow curves, relative sensitivity, dose response, energy response, reproducibility and fading. An ERESCO model 200 MF4-RW X-ray machine and a Gammacell-220 60Co source was used for sample irradiation, while a Harshaw 3500 TLD reader (USA) supported by WinREMS software was used for TL readouts. Within the γ-radiation dose range up to 50 Gy, the various TL parameters show Nasir Glass (a locally produced Glass brand) to offer the most promising performance for retrospective dosimetry. Fading studies indicate the reconstruction of absorbed dose to be possible for periods of up to four weeks post-exposure. Energy dispersive X-ray analysis shows the Zeff of the various Glass to be in the range 12.5–15.1, closely according with that of TLD-200, a Commercial dosimeter used for low-level environmental radiation dosimetry. Present work constitutes the first such study of low-cost Commercial Glass for doses in the range 10–50 Gy, previous literature relating to doses from 50 Gy up to 20 kGy.
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the radiation shielding offered by the Commercial Glass installed in bangladeshi dwellings
Radiation Effects and Defects in Solids, 2018Co-Authors: Sabina Yasmin, Siti Z Rozaila, Mayeen Uddin Khandaker, Bijoy Sonker Barua, F U Z Chowdhury, Md Abdur Rashid, D A BradleyAbstract:ABSTRACTOne sign of a vibrant Bangladeshi economy has been the move away from the use of more traditional housing materials towards a preference for modern constructional media. Glass, one such example, used both decoratively and in a structural context, offers various advantageous properties and facets including a protective feature against radiation that has not previously been considered. Current interest examines the dosimetric possibilities offered by the Commercial Glass as a secondary shield and also in retrospective ionising radiation exposure analysis. Four popular brands of window Glass are investigated, all available within the local market (PHP-Bangladesh, Usmania-Bangladesh, Nasir-Bangladesh and Rider-China), all with the same thickness and colour, varying in terms of elemental weight fractions as evaluated by energy dispersive X-ray analysis. As potential attenuators of transmitted radiation thereby forming secondary barriers against radiation exposure from penetrating radiations, the four b...
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Commercial Glass beads as tlds in radiotherapy produced by different manufacturers
Radiation Physics and Chemistry, 2017Co-Authors: D A Bradley, S Abdul F Sani, S M Jafari, Andrew Nisbet, Nicholas Bates, T JuppAbstract:While Commercial jewellery Glass beads offer the basis of novel radiotherapy TL dosimetry (Jafari et al. 2014a,b,c, 2015a,b), detailed study of TL variation is required for the products from various manufacturers. Investigation is made for Glass beads from four manufacturers from four countries: China (Rocaille), Japan (Mill Hill), Indonesia (TOHO™) and Czech Republic (Czech). Sample composition was determined using an energy-dispersive X-ray unit coupled to a scanning electron microscope. Values of mass attenuation coefficient, μ/ρ, as a function of photon energy were then calculated for photons of energy 1 keV to 10 MeV, using the National Institute of Standards and Technology XCOM program. Radiation and energy response were determined using X-rays generated at accelerating potentials from 80 kVp to 6 MV (TPR20/10¼0.670). All bead types showed TL to be linear with dose (R240.999). Glow curve dosimetric peaks reached a maximum value at 300 °C for the Toho and 290 °C for the Czech and Mill Hill products but was between 200–250 °C for the Rocaille product. Radiation sensitivity following mass normalisation varied within an order of magnitude; Toho samples showed the greatest and Rocaille the least sensitivity. For the Toho, Czech, Rocaille and Mill Hill samples the energy responses at 80 kVp were 5.0, 4.0, 3.6 and 3.3 times that obtained at 6 MV. All four Glass bead types offer potential use as TL dosimeters over doses commonly applied in radiotherapy. Energy response variation was o1% at 6 MV but significant variation was found for photon beam energies covering the kV range; careful characterisation is required if use at this range is intended.
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low cost Commercial Glass beads as dosimeters in radiotherapy
Radiation Physics and Chemistry, 2014Co-Authors: S M Jafari, D A Bradley, C Gouldstone, P H G Sharpe, Amani I Alalawi, T Jordan, C H ClarkAbstract:Recent developments in advanced radiotherapy techniques using small field photon beams, require small detectors to determine the delivered dose in steep dose gradient fields. Commercially available Glass jewellery beads exhibit thermoluminescent properties and have the potential to be used as dosimeters in radiotherapy due to their small size (<5mm), low cost, reusability and inert nature. This study investigated the dosimetric characteristics of Glass beads. The beads were irradiated by 6MV photons using a medical linear-accelerator and Co gamma rays over doses ranging from 1 to 2500cGy. A thermoluminescence (TL) system and an electron paramagnetic resonance (EPR) system were employed for read out. Both the TL and EPR studies demonstrated a radiation-induced signal, the sensitivity of which varied with bead colour. White coloured beads proved to be the most sensitive for both systems. The smallest and therefore least sensitive bead sizes allowed measurement of doses of 1cGy using the TL system while that for the EPR system was approximately 1000cGy. The fading rate was found to be 10% 30 days after irradiation with both readout systems. The dose response is linear with measured dose over the dose range 1 to 2500cGy, with an R correlation coefficient of greater than 0.999. The batch-to-batch reproducibility of a set of dosimeters after a single irradiation was found to be 3% (1 SD). The reproducibility of individual dosimeters was found to be 1.7%. No measurable angular dependence was found (results agreed within 1%). Dose rate response was found to agree within 1% for dose rates of 100 to 600cGy/min. These results demonstrate the potential use of Glass beads as TL dosimeters over the dose range commonly applied in radiotherapy. © 2013 Elsevier Ltd.
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Low-cost Commercial Glass beads as dosimeters in radiotherapy
Radiation Physics and Chemistry, 2014Co-Authors: S M Jafari, D A Bradley, C Gouldstone, Amani I Alalawi, T Jordan, C H Clark, Peter Sharpe, Andrew Nisbet, Nicholas M. SpyrouAbstract:Recent developments in advanced radiotherapy techniques using small field photon beams, require small detectors to determine the delivered dose in steep dose gradient fields. Commercially available Glass jewellery beads exhibit thermoluminescent properties and have the potential to be used as dosimeters in radiotherapy due to their small size (
R. C. Suciu - One of the best experts on this subject based on the ideXlab platform.
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Optical properties of Felinfg2l/infgOlinfg3l/infg films obtained by spray pyrolysis
CAS 2010 Proceedings (International Semiconductor Conference), 2010Co-Authors: V. Popescu, G. L. Popescu, E. Indrea, D. T. Silipaş, R. C. SuciuAbstract:Nanostructured multilayered Fe 2 O 3 films have been deposited onto Commercial Glass slides by spray pyrolysis using FeCl 3 solution and nitrogen as carrier gas. The influences of thermal treatment and of the number of layers on the optical properties of the films have been studied. Structural investigations on the films were performed using X-ray diffraction.
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Optical properties of Fe2O3 films obtained by spray pyrolysis
CAS 2010 Proceedings (International Semiconductor Conference), 2010Co-Authors: V. Popescu, G. L. Popescu, E. Indrea, D. T. Silipaş, R. C. SuciuAbstract:Nanostructured multilayered Fe2O3 films have been deposited onto Commercial Glass slides by spray pyrolysis using FeCl3 solution and nitrogen as carrier gas. The influences of thermal treatment and of the number of layers on the optical properties of the films have been studied. Structural investigations on the films were performed using X-ray diffraction.
Seong Jin Park - One of the best experts on this subject based on the ideXlab platform.
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fabrication of Glass components by sintering of Commercial Glass powder
Ceramics International, 2015Co-Authors: Seungryeol Yi, Randall M German, Seong Jin ParkAbstract:Abstract In this work, plasma display panel (PDP) Glass bodies were prepared by pressureless sintering (PLS) and hot isostatic pressing (HIP). The effects of consolidation conditions including sintering temperature, sintering atmosphere, and HIP variables on final properties were investigated. The Glass compacts were sintered at 625–800 °C, holding for 0–5 h, in different atmospheres. To increase the properties, post-sintering HIP was carried out at 650 °C with a pressure of 82 MPa. The microstructures and optical properties were investigated by a scanning electron microscope (SEM) and a spectrophotometer. The experiment results showed that the sintering conditions such as temperature and atmosphere have a large influence on the Glass bodies. The relative density of the sintered Glass body reached a maximum of 92%; however, after HIP the density reached 99%, almost to full density. The transmittance of HIP material reached 26% at a wavelength of 800 nm, a relatively low value compared with fused Glass bodies. The main reasons were scattering from pores and impurities traced to the raw powder, as verified by X-ray photoelectron spectroscopy (XPS).