Papers by Keyword: Photon

Abstract: In this work, the well-known program WinXCom have been performed over 1 keV to 20 MeV to obtain the radiation properties (in case of theoretical calculation) of calcium-silico-borate glass system containing Lu₂O₃ in the composition of xLu₂O₃ : 10.0CaO : 10.0SiO₂ : (80.0-x)B₂O₃ with x are Lu₂O₃ concentrations varying from 0.0, 5.0, 10.0, 15.0, 20.0, and 25.0 mol%. The total mass attenuation and partial attenuation coefficients have been studied as functions of chemical compositions and incoming photon energies. In addition, the obtained data were then used to compute the effective atomic numbers and effective electron densities. The calculated results show the variation of both parameters with photon energy.

Abstract: This study concerns on the thermoluminescence (TL) characteristics of carbon doped aluminum oxide (Al₂O₃:C) as ionizing radiation dosimeter. The thermoluminescence response, linearity and sensitivity subjected to Co-60 gamma irradiation were investigated. Carbon doped (0.2 mol %) aluminum oxide samples in form of powder were irradiated to 1.25 MeV Co-60 gamma ray with doses ranging from 1 Gy to 50 Gy. Irradiations were performed by using Co-60 gamma ray model 220 Excel with the source activity, A = 2.310925534 kGy h¹ at Universiti Kebangsaan Malaysia. The glow curves were analysed to determine various characterizations of the TLDs. It is shown that the glow curve of the sample contains a single peak at about 180°C with broad peak appears at the right of the spectrum. It is also shown that the TL intensity has linear relationship with delivered dose and the average TL sensitivity was calculated as 3.30 nC mg^-1 Gy^-1.

Abstract: In an experiment conducted at the Tomsk synchrotron "Sirius", the photon yield of parametric X-ray radiation generated by 500 MeV electrons in a tungsten monocrystal in Bragg geometry has been studied. The (111) tungsten monocrystal, having a thickness of 1.7 mm and a surface mosaicity of not more than 80^², was oriented at the Bragg angle θ_B = 45^° to the direction of the electron beam. The photons were detected at the angle 2θ_B = 90° relative to the electron beam. A comparison of PXR angular distributions with calculations has been carried out with taking into account the actual conditions of the experiment.

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.

Abstract: In this paper, we demonstrate using laser induced forward transfer (LIFT) technology to deposit Ti/Ni alloy on a glass substrate with high precision. Here the photonic feature of laser energy is used to move the Ti/Ni particles forward and deposit them on the glass, while the wave feature of laser is used to turn part of the Ti/Ni particles into ions. The characteristics of deposited films and their relations with the processing conditions are studied. A new method of depositing materials using photons instead of electrons in electric field may bring about a series of new technologies on surface deposition, which can be used to produce shape memory alloys.

Abstract: Gong Zutong academician guessed that the structure of the photon may be similar to the hydrogen atom which consists of a negative charge and a positive charge with the equal power, and the negative charge rotates around the positive charge in a spherical orbit. Based on this conjecture, to establish respectively the equation of photon movement for the dual-slit interference and single slit diffraction experiments. To get respectively the light intensity distribution model using complex integration method. Finally, to get that the width of the diffraction pattern of the conjecture is obviously wider than the results of Born through mathematical simulation in MATLAB software.