Intrinsic XRF corrections in Timepix3 CdTe spectral detectors

M. Khalil*, D. Turecek, J. Jakubek, J. Kehres, E. S. Dreier, U. L. Olsen

*Corresponding author for this work

Research output: Contribution to journalConference articleResearchpeer-review

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Abstract

One of the limitations of Hybrid Pixel Detectors (HPD) is the intrinsic X-ray fluorescence emission from the detector semiconductor sensor. These fluorescence photons cause artifacts and false peaks in the photon energy spectrum measured by the HPD . ADVAPIX-Timepix3 is an energy dispersive HPD based on a semiconductor sensor (Si/CdTe/CZT/GaAS) and readout by a Timepix3 ASIC . Timepix3 is capable of measuring simultaneous Time-Over-Threshold (Energy) and Time-of-Arrival as well as sparse readout. This allows unambiguous one-by-one photon detection where each photon measurement is assigned a time stamp. In this work, we use the time and energy information of every single photon to identify intrinsic XRF events in a 57Co radioactive source spectrum as measured by a CdTe based detector. We compute the minimum time (ns) and space (pixels) coincidence window, between the XRF and escape photons, that is required to suppress the XRF effect. These parameters were found to be ± 15 ns and 10 pixels (pixel size = 55 μm) for 1 mm CdTe at 3000 V/cm, 24 ± 1°C, and a flux of 1.666 × 103 photons/s before correction.
Original languageEnglish
Article numberC01018
JournalJournal of Instrumentation
Volume14
Issue number1
Number of pages9
ISSN1748-0221
DOIs
Publication statusPublished - 2019

Keywords

  • Hybrid detectors
  • Image processing
  • Solid state detectors
  • X-ray detectors

Cite this

Khalil, M. ; Turecek, D. ; Jakubek, J. ; Kehres, J. ; Dreier, E. S. ; Olsen, U. L. / Intrinsic XRF corrections in Timepix3 CdTe spectral detectors. In: Journal of Instrumentation. 2019 ; Vol. 14, No. 1.
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title = "Intrinsic XRF corrections in Timepix3 CdTe spectral detectors",
abstract = "One of the limitations of Hybrid Pixel Detectors (HPD) is the intrinsic X-ray fluorescence emission from the detector semiconductor sensor. These fluorescence photons cause artifacts and false peaks in the photon energy spectrum measured by the HPD . ADVAPIX-Timepix3 is an energy dispersive HPD based on a semiconductor sensor (Si/CdTe/CZT/GaAS) and readout by a Timepix3 ASIC . Timepix3 is capable of measuring simultaneous Time-Over-Threshold (Energy) and Time-of-Arrival as well as sparse readout. This allows unambiguous one-by-one photon detection where each photon measurement is assigned a time stamp. In this work, we use the time and energy information of every single photon to identify intrinsic XRF events in a 57Co radioactive source spectrum as measured by a CdTe based detector. We compute the minimum time (ns) and space (pixels) coincidence window, between the XRF and escape photons, that is required to suppress the XRF effect. These parameters were found to be ± 15 ns and 10 pixels (pixel size = 55 μm) for 1 mm CdTe at 3000 V/cm, 24 ± 1°C, and a flux of 1.666 × 103 photons/s before correction.",
keywords = "Hybrid detectors, Image processing, Solid state detectors, X-ray detectors",
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Intrinsic XRF corrections in Timepix3 CdTe spectral detectors. / Khalil, M.; Turecek, D.; Jakubek, J.; Kehres, J.; Dreier, E. S.; Olsen, U. L.

In: Journal of Instrumentation, Vol. 14, No. 1, C01018, 2019.

Research output: Contribution to journalConference articleResearchpeer-review

TY - GEN

T1 - Intrinsic XRF corrections in Timepix3 CdTe spectral detectors

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AU - Turecek, D.

AU - Jakubek, J.

AU - Kehres, J.

AU - Dreier, E. S.

AU - Olsen, U. L.

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N2 - One of the limitations of Hybrid Pixel Detectors (HPD) is the intrinsic X-ray fluorescence emission from the detector semiconductor sensor. These fluorescence photons cause artifacts and false peaks in the photon energy spectrum measured by the HPD . ADVAPIX-Timepix3 is an energy dispersive HPD based on a semiconductor sensor (Si/CdTe/CZT/GaAS) and readout by a Timepix3 ASIC . Timepix3 is capable of measuring simultaneous Time-Over-Threshold (Energy) and Time-of-Arrival as well as sparse readout. This allows unambiguous one-by-one photon detection where each photon measurement is assigned a time stamp. In this work, we use the time and energy information of every single photon to identify intrinsic XRF events in a 57Co radioactive source spectrum as measured by a CdTe based detector. We compute the minimum time (ns) and space (pixels) coincidence window, between the XRF and escape photons, that is required to suppress the XRF effect. These parameters were found to be ± 15 ns and 10 pixels (pixel size = 55 μm) for 1 mm CdTe at 3000 V/cm, 24 ± 1°C, and a flux of 1.666 × 103 photons/s before correction.

AB - One of the limitations of Hybrid Pixel Detectors (HPD) is the intrinsic X-ray fluorescence emission from the detector semiconductor sensor. These fluorescence photons cause artifacts and false peaks in the photon energy spectrum measured by the HPD . ADVAPIX-Timepix3 is an energy dispersive HPD based on a semiconductor sensor (Si/CdTe/CZT/GaAS) and readout by a Timepix3 ASIC . Timepix3 is capable of measuring simultaneous Time-Over-Threshold (Energy) and Time-of-Arrival as well as sparse readout. This allows unambiguous one-by-one photon detection where each photon measurement is assigned a time stamp. In this work, we use the time and energy information of every single photon to identify intrinsic XRF events in a 57Co radioactive source spectrum as measured by a CdTe based detector. We compute the minimum time (ns) and space (pixels) coincidence window, between the XRF and escape photons, that is required to suppress the XRF effect. These parameters were found to be ± 15 ns and 10 pixels (pixel size = 55 μm) for 1 mm CdTe at 3000 V/cm, 24 ± 1°C, and a flux of 1.666 × 103 photons/s before correction.

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KW - X-ray detectors

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