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Intrinsic limitations in the energy resolution of drift-field based radiation d...
Távora, L. M. N.; Conde, C. A. N.; Santos, F. P.; Dias, T. H. V. T.; Rachinhas, P. J. B. M.http://www.sciencedirect.com/science/article/B6TVT-4CJV8FD-4/1/9b1ae9691329367fa8f13902d8fd318d
Development of portable gas proportional scintillation counters for x-ray spect...
Santos, J. M. F. dos; Lopes, J. A. M.; Veloso, J. F. C. A.; Simões, P. C. P. S.; Dias, T. H. V. T.; Santos, F. P.; Rachinhas, P. J. B. M.A review on gas proportional scintillation counters (GPSCs) is presented. Recent achievements towards the portability of simple, inexpensive and compact GPSCs are discussed. Compensation of solid angle effects with the curved grid technique can be used to produce non-focused GPSCs with medium-sized radiation windows, at least up to 80% of the photosensor active diameter, without degradation of detector performa...
Simulation and experimental results for the detection of conversion electrons w...
Rachinhas, P. J. B. M.; Simões, P. C. P. S.; Lopes, J. A. M.; Dias, T. H. V. T.; Morgado, R. E.; Santos, J. M. F. dos; Stauffer, A. D.; Conde, C. A. N.The application of gas proportional scintillation counters (GPSC) to the detection and identification of conversion electrons in the medium energy range is investigated. Experimental and Monte Carlo results are presented for the response of a xenon GPSC, filled at atmospheric pressure, to the decay of a 109Cd source. This source emits 88.0 keV [gamma]-rays, eL=84.6 keV and eK=62.5 keV conversion electrons, as w...
Operation of gas proportional scintillation counters in a low charge multiplica...
Borges, F. I. G. M.; Santos, J. M. F. dos; Dias, T. H. V. T.; Santos, F. P.; Rachinhas, P. J. B. M.; Conde, C. A. N.The operation of a xenon filled gas proportional scintillation counter under low charge multiplication gains is discussed. It is shown that the best energy resolution for X-rays is obtained for a reduced electric field, E/p, of about 8 V cm-1 Torr-1, leading to a charge gain (for inter-grid distance of 5 mm) of about 1.05, as calculated by a Monte Carlo simulation method. A discussion is presented concerning th...
Energy resolution of xenon proportional counters: Monte Carlo simulation and ex...
Rachinhas, P. J. B. M.; Dias, T. H. V. T.; Stauffer, A. D.; Santos, F. P.; Conde, C. A. N.The gas multiplication factor M and energy resolution R of xenon gas cylindrical proportional counters are investigated experimentally and calculated theoretically using a Monte Carlo technique to simulate the growth of single-electron-initiated avalanches. A good agreement is found between calculated and experimental data. The experimental and the calculated results are presented as a function of the reduced v...
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