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Open AccessArticle

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
Sensors 2016, 16(10), 1591; https://doi.org/10.3390/s16101591
Received: 18 July 2016 / Revised: 2 September 2016 / Accepted: 6 September 2016 / Published: 27 September 2016
(This article belongs to the Section Physical Sensors)
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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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. https://doi.org/10.3390/s16101591

AMA 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(10):1591. https://doi.org/10.3390/s16101591

Chicago/Turabian Style

Pekárek, Jakub; Dědič, Václav; Franc, Jan; Belas, Eduard; Rejhon, Martin; Moravec, Pavel; Touš, Jan; Voltr, Josef. 2016. "Infrared LED Enhanced Spectroscopic CdZnTe Detector Working under High Fluxes of X-rays" Sensors 16, no. 10: 1591. https://doi.org/10.3390/s16101591

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