Papers by Author: Jakrapong Kaewkhao

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Authors: Punsak Glumglomchit, Juniastel Rajagukguk, Jakrapong Kaewkhao, Keerati Kirdsiri
Abstract: This work, gamma-ray shielding properties of the lutetium lithium borate glasses in the system Lu2O3 - Li2O - B2O3 have been evaluated as a shielding material at 662 keV photon energy. While the experimental mass attenuation coefficients (μm) have been determined by using the narrow beam transmission method, the theoretical data were calculated using WinXCom program. The good agreements between experimental and theoretical values have been obtained. Both experimental and computational mass attenuation coefficients data were used to obtain the effective atomic number (Zeff), and the effective electron density (Nel). Based on the obtained data, the Lu-based glasses have good shielding properties, the improved glasses could be used as gamma-rays shielding material.
Authors: Kittipong Siengsanoh, Weerapong Chewpraditkul, Pichet Limsuwan, Kitipun Boonin, Jakrapong Kaewkhao, Pruittipol Limkitjaroenporn
Abstract: This work studied about the angular and intensity distributions on multiple scattering gamma energy 662 keV, obtained from 137Cs source. The gamma photons are incident on aluminium scatterer of varying thickness is studied experimentally in both the forward and backward hemispheres. The observed spectra recorded by a properly shielded NaI(Tl) scintillation detector. To extract the contribution of multiply scattered photons having same energy as in the singly scattered distribution from the measured spectra, a singly scattered distribution is reconstructed analytically. We observed that the number of multiply scattered photons also increases and saturates at a particular value of the scaterrer thickness and determined at different scattering angles.
Authors: N. Srisittipokakun, C. Kedkaew, Jakrapong Kaewkhao, Pichet Limsuwan
Abstract: The UV-visible spectra of soda-lime-silicate glass system with the base composition (65-x) SiO2: 10CaO: 25Na2O: xMnO2 % mol, (where x is 0.0, 0.02, 0.05, 0.10, 0.30 and 0.50 %mol) were studied at room temperature. The results are shown that the colors of glass samples were altered from colorless to dark purple with increasing of MnO2 concentration and were stable at room temperature. The color of glass sample with 0.3 %mol MnO2 was purple. Moreover, it has been found that the density and refractive index were contiguous. The optical absorption spectra can be confirmed the color of these glass samples. They exhibited a predominant broadband around 500 nm and it was clearly observed, its increasing since 0.1 %mol of MnO2. This band corresponds to an allowed transition from 5Eg5T2g, which attributed to Mn3+. When increasing MnO2 concentration, the absorption band due to Mn3+ ion was dominating.
Authors: Noppadon Chamchoi, Narong Sangwaranatee, Jakrapong Kaewkhao, A. Montree, K. Teanchai, Wichian Siriprom
Abstract: In present study, the structural and trace element were preliminary survey the potentiality to use as filler material for produced the biocomposite films. The first raw material is chitosan and the second raw material is chicken eggshell. Both raw material were investigated the structural and morphological with X-ray Diffraction (XRD) and Scaning Electron Microscope (SEM), respectively. While, Fourier transform infrared spectroscopy (FT-IR) the Energy Dispersive X-ray Fluorescence (EDXRF) were used to investigate functional group and trace element, respectively. The result show that, both material have crystalline structural. The chicken eggshell have calcite structure while the chitosan have amorphos-crystalline structure. The chemical composition in both material compose of P, Ca, Fe similarly but the concentration have been different.
Authors: N.W. Sangwaranatee, Narong Sangwaranatee, Jakrapong Kaewkhao, Natthakridta Chanthima
Abstract: Commercial window added with BaSO4 have been studies on the mass attenuation coefficient and compared it with some standard shielding concretes. This parameter has been investigated at photon energy from 1 keV to 100 GeV on the basis of calculation. The theoretical values of photon interaction were obtained by the WinXCom program. The variations of mass attenuation coefficient of commercial window and standard shielding concretes are shown graphically with photon energy. It has been observed that the commercial window added with 30% BaSO4 has higher value of mass attenuation coefficient than all of standard shielding concretes at the photon energy range above 40-400 keV. Also, discontinuous jump of mass attenuation coefficient at the lower energy has been discusses.
Authors: Pruittipol Limkitjaroenporn, Narong Sangwaranatee, Wuttichai Chaiphaksa, Jakrapong Kaewkhao
Abstract: This article, for comparison, the non-proportionality of light yield and energy resolution of BGO, LYSO and CsI(Tl) scintillators couple to the R1306 PMT readouts were investigated. At 662 keV from 137Cs source, the good energy resolution of 7.13% for CsI(Tl) superior than LYSO and BGO scintillators. The energy resolution on gamma-ray energy was also evaluated to expose the scintillator intrinsic resolution parameters. For non-proportionality of light yield, the study showed a light yield non-proportionality 0.35% of LYSO, the value is better than 4.82 % for CsI(Tl) and 1.53 % of BGO scintillators.
Authors: Narong Sangwaranatee, Mati Horprathum, Jakrapong Kaewkhao
Abstract: Transparent niobium oxide thin films were prepared by dc reactive magnetron sputtering under different oxygen flow rate. The niobium oxide thin films have been deposited on silicon wafer and glass substrate from a 99.99% pure niobium target at room temperature. The films were characterized to obtain the relationship between oxygen flow rate and deposition rate, structural, morphology and optical. The result show that the deposition rate decreased with increasing the oxygen flow rate. However, the transmittance spectrum percentage increases with increasing the oxygen flow rate.
Authors: Narong Sangwaranatee, Jakrapong Kaewkhao, Natthakridta Chanthima
Abstract: The total mass attenuation coefficient, partial photon interaction and effective atomic number of commercial window added with BaSO4 in have been investigated at photon energy from 1 keV to 100 GeV on the basis of calculation. The theoretical values of total and partial interaction were obtained by the WinXCom software. The variations of mass attenuation coefficient and effective atomic number with photon energy are shown graphically. The results show that the variation of mass attenuation coefficient and effective atomic number has changed with photon energy and composition of window. It has been found that these parameters increase with increasing BaSO4 concentrations, due to the increasing photoelectric absorption in glass samples. These results showed that the BaSO4 can improve radiation shielding properties in commercial glass and useful for radiation shielding material design.
Authors: Suparat Tuscharoen, Smit Insiripong, T. Korkut, Jakrapong Kaewkhao
Abstract: A glass system with chemical formula xB2O3:20Bi2O3:(100-x) Al2O3 (x = 55, 60, 65, 70, 75 and 80 mol%) is prepared by melt quenching technique and were investigated the physical and neutron shielding properties. The physical properties were investigated by density, molar volume and discussed with different Al2O3 contents. The neutron shielding property was investigated by Monte Carlo techniques (FLUKA and GEANT4 codes) and neutron equivalent dose rate measurements. As a result, neutron shielding capacity of glass samples decrease with increased Al2O3 content, so increased B2O3 content is a result of positive effects on neutron shielding.
Authors: Suparat Tuscharoen, Suwimon Ruengsri, Jakrapong Kaewkhao
Abstract: This paper is report on the physical and optical properties of development barium-borate-rice husk ash (BaBRHA) glass system. The glasses containing BaO in xBaO:(80-x)B2O3:20RHA where x = 30, 35, 40 and 45 wt% have been prepared by melt quenching technique. The physical properties of this glass are shown from density data. The optical properties were investigated from refractive index and transmission by using Abbe-refractometer and UV-visible spectrometer respectively.
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