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Development of a high resolution LaGPS imaging detector with pulse shape discrimination capability of different types of radiations
摘要： Ce doped (Gd,La)2Si2O7 (LaGPS) is a new scintillator which has high light output and is a promising candidate for high resolution radiation imaging detectors. Thus we developed a radiation imaging detector using a LaGPS plate combined with a position sensitive photomultiplier tube (PSPMT) and evaluated the performance. We found that the decay times of LaGPS were different with the types of radiations and the separations of the images of the different types of radiations were possible using pulse shape discrimination. The spatial resolution for Am-241 alpha particles (5.5 MeV) was better than 0.31 mm FWHM and the energy resolution was 11 % FWHM. The spatial resolution for Sr–Y-90 beta particles was ～0.6 mm FWHM and those for Co-57 gamma photons (122 keV) and Cs-137 X-ray (～35 keV) were better than 0.6 mm FWHM and ～0.8 mm FWHM, respectively. The decay times for alpha particles, beta particles, and gamma photons were 143 ns, 124 ns, and 119 ns, respectively. With these different decay times, the separation of alpha particles and gamma photons or beta particles was possible using the pulse shape discrimination. We conclude that the developed LaGPS imaging detector has high resolution for all types of radiations and is also capable of the simultaneous imaging and separating the different types of radiations.
关键词： Alpha particles,Imaging,Pulse shape discrimination,Beta particles,Gamma photons,Decay time,LaGPS
更新于2025-09-19 17:15:36
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Stuctural, optical and radiation shielding properties of zinc boro-tellurite alumina glasses
摘要： In this work, boro-telluride glasses with additional zinc, aluminum, and alkali–alkaline modifiers have been synthesized using the melt-quenching–annealing method. Six glasses were fabricated with composition of [(60 ? x)B2O3–(10 + x)TeO2–10ZnO–10Al2O3–5Li2O–5MgO] all in mol% and x varied from 0, 10, 20, 30, 40 and 50. The aim of this work is to understand the effect of changing the main glass former from B2O3 → TeO2, to obtain new optical materials. To confirm the amorphous nature of these six glasses, X-ray diffraction was characterized for all six glasses from 10° to 80°. Optical absorption with wavelength range 200–800 nm in room temperature was measured, and the optical absorption coefficient α(λ) calculated to obtain the cutoff wavelength. In addition, gamma photons shielding features of the prepared K1–K6 glasses were evaluated by means of some essential parameters such as mass attenuation coefficients (μ/ρ) and effective atomic number (Zeff) at five energies between 0.356 and 1.33 MeV. No significant difference between the theoretical and simulation μ/ρ values was found. The effective atomic number results indiacte that as the TeO2 content increases, the photons’ attenuation increases. The number of interactions of gamma photons with K6 sample (which contains the maximum amount of TeO2) is relatively high (in comparison to the rest of the samples), which results in more attenuation and thus better shielding features for K6.
关键词： Effective atomic number,Mass attenuation coefficients,Gamma photons shielding,Boro-tellurite glasses,Optical materials
更新于2025-09-04 15:30:14