Abstract:We present preliminary tests of hybrid pixel detectors consisting of the Medipix2 readout chip bump-bonded to a 1-mm-thick CdTe pixel detector. This room temperature imaging system for single photon counting has been developed within the Medipix2 European Collaboration for various imaging applications with X-rays and gamma rays, including dental radiography, mammography, synchrotron radiation, nuclear medicine, and radiation monitoring in nuclear facilities. The Medipix2 + CdTe hybrid detector features 256 256… Show more
“…The bias current was time-dependent and a diode-like behavior was observed as previously reported in Ref. [2]. The current started at a high value when power was turned on and then stabilized after a couple of minutes.…”
Section: Operating Point and Biassupporting
confidence: 76%
“…[1][2][3]) are interesting because of low noise operation and their ability to record the energy of each individual photon [3]. One such readout chip is the MEDIPIX2 chip [1] with a pixel size of 55 Â 55 mm 2 .…”
Section: Background and Experimental Conditionsmentioning
“…The bias current was time-dependent and a diode-like behavior was observed as previously reported in Ref. [2]. The current started at a high value when power was turned on and then stabilized after a couple of minutes.…”
Section: Operating Point and Biassupporting
confidence: 76%
“…[1][2][3]) are interesting because of low noise operation and their ability to record the energy of each individual photon [3]. One such readout chip is the MEDIPIX2 chip [1] with a pixel size of 55 Â 55 mm 2 .…”
Section: Background and Experimental Conditionsmentioning
“…As one can guess looking at the transport properties of CdTe (Table 2), and specially with a hole mobility 20 times lower than in silicon, this working mode seems to be not very suitable in our case (short shaping time) even if some authors report more uniform charge collection in this mode when using ohmic contacts [6]. The only way to circumvent this problem will be to apply a high collection field in high-quality material (hole lifetime).…”
“…Each pixel comprises two individually adjustable thresholds and a 13-bit counter. The main application is X-ray imaging but we participated in the development of CdTe detectors 1 mm thick bump-bonded on Medipix2 chips for higher-energy applications [7]. Fig.…”
Section: Gamma Imaging With a Semiconductor Pixel Detectormentioning
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