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Micro-hole and strip plate-based photosensor
Freitas, E. D. C.; Veloso, J. F. C. A.; Breskin, A.; Chechik, R.; Amaro, F. D.; Ferreira, L. F. Requicha; Maia, J. M.; Santos, J. M. F. dosThe performance of a new VUV photosensor, based on an micro-hole and strip plate (MHSP) electron multiplier with a CsI photocathode deposited on its top electrode, is described. This photosensor presents gains above 104 when operating in an Ar-5%Xe gas mixture at 1 atm. Although the gain of a single MHSP is not sufficient for efficient detection of single photons, this simple UV photosensor may be useful for th...
The X-ray performance of a driftless gas proportional scintillation counter usi...
Covita, D. S.; Simões, P. C. P. S.; Fernandes, L. M. P.; Freitas, E. D. C.; Ferreira, L. F. Requicha; Veloso, J. F. C. A.; Santos, J. M. F. dosPerformance characteristics are evaluated for a xenon driftless gas proportional scintillation counter (GPSC), for which detector pulses are formatted using very short shaping-time constants (~50 ns), and directly analyzed by the MCA without previous pulse time duration analysis and amplitude correction. The present detector and method allow the achievement of detector energy linearity and energy resolution sim...
Energy linearity response of CZT detectors to X-rays in the region of the Zn, C...
Freitas, E. D. C.; Cardoso, João M.; Fernandes, L. M. P.; Lopes, J. A. M.; Veloso, J. F. C. A.; Santos, J. M. F. dosThe response of a cadmium zinc telluride (CZT) detector to X-rays with energies around the Zn, Cd and Te K-absorption edges was investigated. The energy non-linearity in the detector response at the K-edges is less than 0.1%, within the experimental errors. No abrupt variation in both the w-value and the detector energy resolution was observed at the K-edges, a behaviour consistent with the absence of intrinsic...
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