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Dependence of the performance of CsI-covered microstrip plate VUV photosensors on geometry: experimental results

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4 Author(s)
Freitas, D.S.A.P. ; Dept. de Fisica, Coimbra Univ., Portugal ; Veloso, J.F.C.A. ; dos Santos, J.M.F. ; Conde, C.A.N.

The behavior of a xenon-filled microstrip gas chamber instrumented with a microstrip plate with eight different microstrip geometries is reported. The best energy resolution achieved for 5.9-keV and for 22.1-keV X-rays was 13.6% and 7.0%, respectively. The same microstrip plate covered with a CsI film was used in place of the photomultiplier tube to detect the vacuum ultraviolet scintillation light produced in a driftless xenon-filled gas proportional scintillation counter. The relative amplitude, energy resolution,. optical positive feedback, and photoelectron extraction efficiency are discussed. The energy resolution obtained for 5.9-keV X-rays was 11.4%, which is better than that achieved with a standard proportional counter, about 13% for argon based proportional counters.

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Nuclear Science, IEEE Transactions on  (Volume:49 ,  Issue: 4 )