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Sensors 2016, 16(10), 1591; doi:10.3390/s16101591

Infrared LED Enhanced Spectroscopic CdZnTe Detector Working under High Fluxes of X-rays

1
Institute of Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, Prague 12116, Czech Republic
2
Crytur Ltd., Palackého 175, Turnov 51101, Czech Republic
3
National Radiation Protection Institute, Bartoškova 28, Prague 14000, Czech Republic
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 18 July 2016 / Revised: 2 September 2016 / Accepted: 6 September 2016 / Published: 27 September 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [2752 KB, uploaded 27 September 2016]   |  

Abstract

This paper describes an application of infrared light-induced de-polarization applied on a polarized CdZnTe detector working under high radiation fluxes. We newly demonstrate the influence of a high flux of X-rays and simultaneous 1200-nm LED illumination on the spectroscopic properties of a CdZnTe detector. CdZnTe detectors operating under high radiation fluxes usually suffer from the polarization effect, which occurs due to a screening of the internal electric field by a positive space charge caused by photogenerated holes trapped at a deep level. Polarization results in the degradation of detector charge collection efficiency. We studied the spectroscopic behavior of CdZnTe under various X-ray fluxes ranging between 5 × 10 5 and 8 × 10 6 photons per mm 2 per second. It was observed that polarization occurs at an X-ray flux higher than 3 × 10 6 mm 2 ·s 1 . Using simultaneous illumination of the detector by a de-polarizing LED at 1200 nm, it was possible to recover X-ray spectra originally deformed by the polarization effect. View Full-Text
Keywords: CdZnTe; X-ray detector; high flux; polarization; de-polarization; Pockels effect CdZnTe; X-ray detector; high flux; polarization; de-polarization; Pockels effect
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Pekárek, J.; Dědič, V.; Franc, J.; Belas, E.; Rejhon, M.; Moravec, P.; Touš, J.; Voltr, J. Infrared LED Enhanced Spectroscopic CdZnTe Detector Working under High Fluxes of X-rays. Sensors 2016, 16, 1591.

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