Spectrometric characteristic improvement of CdTe detectors

Іванов, В.І.; Garbusin, V.; Dorogov, P.; Loutchanski, A.; Kondrashov, V.

doi:10.1109/23.467840

Cited by 35 publications

(5 citation statements)

References 3 publications

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“…The so called polarization effect was detected when the operation temperature was higher than about -20 "C. It was seen as a deterioration of the spectroscopic performance of the detector with time. We did not detect any polarization at operation temperatures around -30 "C. For further energy resolution improvement, a Pulse Shape Discrimination (PSD) device [6] was applied. It is especially efficient at high energies, because at these energies the low hole collection efficiency problem is more severe.…”

Section: Results Of Measurementsmentioning

confidence: 89%

The influence of the M-/spl pi/-n structure on CdTe X-ray detector performance

Іванов

Aleksejava²,

Gagliardi³

et al. 1998

IEEE Trans. Nucl. Sci.

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High energy resolution, good charge collection and low spectral background havc been obtained with M-n-n CdTe xray detectors. The good spectroscopic performance is mainly due to the high quality of the CdTe crystals and the M-n-n structure (metalhlightly p-type semiconductorh-type semiconductor). With the M-n-n structure we were able to achieve leakage current densities below 1 nNmm . Further reduction in the leakage current was achieved by cooling the detectors. Low leakage currents enabled the use of higher bias voltages resulting in better charge collection efficiency, which improved the spectral response. In addition, low leakage currents made possible the use of low noise pulsed feedback preamplifiers which further improved the energy resolution. Energy resolutions of 0.42 keV at 5.9 keV, 0.62 keV at 59.6 keV and 2.4 keV at 662 keV have been measured for a detector of size 2.5 mm x 2.5 mm x 0.6 mm and 1.9 keV at 662 keV for a detector of size 4 mm x 4 mm x 1 mm at -30 "C.The application of pulse shape discrimination improved the energy resolution to 1.5 keV at 662 keV. In this work the performances of CdTe detectors before and after processing the M-n-n structure were compared. 2

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Section: Results Of Measurementsmentioning

confidence: 89%

The influence of the M-/spl pi/-n structure on CdTe X-ray detector performance

Іванов

Aleksejava²,

Gagliardi³

et al. 1998

IEEE Trans. Nucl. Sci.

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“…The industrial version of the CEA LIST miniature embedded CZT spectrometer [1] is provided by IMS Company as presented on Figure 1. One of the advantages provided by this detector [2] is to allow gamma-ray spectra fast and efficient measurements at room temperature with high intrinsic energy resolution, ~3% at 661 keV ( 137 Cs), required for radioisotopic separation in case of mixt signals due to more than one radionuclide detected. This device was integrated on the SISPEO robot and once communication established with the spectrometer an especially designed algorithm method allows spectra measured analysis online and in motion to provide to the user direct results management and reading on the pilot screen.…”

Section: Czt Spectrometer Integration On Robotmentioning

confidence: 99%

An online change of activity in energy spectrum for detection on an early intervention robot

Boudergui

Laine

Montagu

et al. 2015

2015 4th International Conference on Advancements in Nuclear Instrumentation Measurement Methods and Their Applications (ANIMMA

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With the growth of industrial risks and the multiplication of CBRNe (Chemical Biological Radiological and explosive) attacks through toxic chemicals, biological or radiological threats, public services and military authorities face with increasingly critical situations, whose management is strongly conditioned by fast and reliable establishment of an informative diagnostic. Right after an attack, the five first minutes are crucial to define the various scenarii and the most dangerous for a human intervention. Therefore the use of robots is considered essential by all stakeholders of security. In this context, the SISPEO project (Système d'Intervention Sapeurs Pompiers Robotisé) aims to create/build/design a robust response through a robotic platform for early intervention services such as civil and military security in hostile environments. CEA LIST has proposed an adapted solution to detect and characterize nuclear and radiological risks online and in motion, using a miniature embedded CdZnTe (CZT) crystal Gamma-ray spectrometer.This paper presents experimental results for this miniature embedded CZT spectrometer and its associated mathematical method to detect and characterize radiological threats online and in motion.

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“…Electronic methods have also been used to improve the spectrometric performance of CdZnTe detectors, such as pulse shape discrimination (PSD) [16–19] and pulse rise-time compensation (PRC) [17,20]. Both of these techniques are implemented in combination with hardware and software.…”

Section: Techniques To Reduce Hole Trappingmentioning

confidence: 99%

Progress in the Development of CdZnTe Unipolar Detectors for Different Anode Geometries and Data Corrections

Zhang

et al. 2013

Sensors

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CdZnTe detectors have been under development for the past two decades, providing good stopping power for gamma rays, lightweight camera heads and improved energy resolution. However, the performance of this type of detector is limited primarily by incomplete charge collection problems resulting from charge carriers trapping. This paper is a review of the progress in the development of CdZnTe unipolar detectors with some data correction techniques for improving performance of the detectors. We will first briefly review the relevant theories. Thereafter, two aspects of the techniques for overcoming the hole trapping issue are summarized, including irradiation direction configuration and pulse shape correction methods. CdZnTe detectors of different geometries are discussed in detail, covering the principal of the electrode geometry design, the design and performance characteristics, some detector prototypes development and special correction techniques to improve the energy resolution. Finally, the state of art development of 3-D position sensing and Compton imaging technique are also discussed. Spectroscopic performance of CdZnTe semiconductor detector will be greatly improved even to approach the statistical limit on energy resolution with the combination of some of these techniques.

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Spectrometric characteristic improvement of CdTe detectors

Cited by 35 publications

References 3 publications

The influence of the M-/spl pi/-n structure on CdTe X-ray detector performance

The influence of the M-/spl pi/-n structure on CdTe X-ray detector performance

An online change of activity in energy spectrum for detection on an early intervention robot

Progress in the Development of CdZnTe Unipolar Detectors for Different Anode Geometries and Data Corrections

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