Recently developed CdTe Schottky diode detectors1
with 1 mm thickness have shown an advantage over
2 mm thick CZT detectors. The use of Schottky contacts in CdTe detectors reduces the leakage current
far below that of CZT. This permits the use of a much higher bias voltage than in a standard detector.
Since the charge transport properties of the CdTe detector are much higher than CZT, the net result is a
vast improvement in the usable depth (sensitivity). Additionally, because hole tailing and electronic noise
are reduced, not only is the sensitivity improved but resolution is much better.
The use of the Rise Time Discriminator (RTD) in the main amplifier has the effect of eliminating pulses
that originate from events near the back contact of the detector. In CZT, sometimes more than 50% of the
actual thickness of the detector is, in effect, eliminated through the use of RTD in order to obtain a
spectrum with good resolution. The new CdTe diode detectors can produce high resolution spectra
without the use of RTD
Recently developed CdTe Schottky diode detectors1 with 1 mm thickness have shown an advantage over2 mm thick CZT detectors. The use of Schottky contacts in CdTe detectors reduces the leakage currentfar below that of CZT. This permits the use of a much higher bias voltage than in a standard detector.Since the charge transport properties of the CdTe detector are much higher than CZT, the net result is avast improvement in the usable depth (sensitivity). Additionally, because hole tailing and electronic noiseare reduced, not only is the sensitivity improved but resolution is much better.The use of the Rise Time Discriminator (RTD) in the main amplifier has the effect of eliminating pulsesthat originate from events near the back contact of the detector. In CZT, sometimes more than 50% of theactual thickness of the detector is, in effect, eliminated through the use of RTD in order to obtain aspectrum with good resolution. The new CdTe diode detectors can produce high resolution spectrawithout the use of RTD
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