Newly designed HgI2 linear arrays based on resistive charge division, obtained by depositing a Ge surface resistive layer (with typical interstrip resistances of ≈4 and 6 MΩ) between the read-out Pd strips, have been fabricated. These detectors, coupled with specially designed front-end electronics, have shown a high detection efficiency over a large active detection area and an energy resolution of 20% for X-ray energy Ex = 22 keV, estimated to become < 5% at Ex > 100 keV. Further, a spatial sensitivity of ≈10 μm and a spatial resolution of ≈100 μm have been obtained at 30 keV, by making use, for a fine spatial characterization of the devices, of a laser beam spot 50 μm in diameter with wavelength tuned to match the crystal band gap (582 nm). These devices could be successfully employed in basic research (for example Bragg X-ray spectrometry) and for radiological and high-energy (Ex > 100 keV) astrophysical applications.
High spatial resolution HgI2 linear array based on resistive charge division / Grassi, D.; Perillo, E.; Gigante, Giovanni Ettore; De Cesare, N.; Spadaccini, G.; Vigilante, M.; Dusi, W.; Amann, M.; Koebel, J. M.; Siffert, P.. - In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT. - ISSN 0168-9002. - STAMPA. - 390:1-2(1997), pp. 175-182. [10.1016/S0168-9002(97)00336-7Document]
High spatial resolution HgI2 linear array based on resistive charge division
GIGANTE, Giovanni Ettore;
1997
Abstract
Newly designed HgI2 linear arrays based on resistive charge division, obtained by depositing a Ge surface resistive layer (with typical interstrip resistances of ≈4 and 6 MΩ) between the read-out Pd strips, have been fabricated. These detectors, coupled with specially designed front-end electronics, have shown a high detection efficiency over a large active detection area and an energy resolution of 20% for X-ray energy Ex = 22 keV, estimated to become < 5% at Ex > 100 keV. Further, a spatial sensitivity of ≈10 μm and a spatial resolution of ≈100 μm have been obtained at 30 keV, by making use, for a fine spatial characterization of the devices, of a laser beam spot 50 μm in diameter with wavelength tuned to match the crystal band gap (582 nm). These devices could be successfully employed in basic research (for example Bragg X-ray spectrometry) and for radiological and high-energy (Ex > 100 keV) astrophysical applications.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
