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Indirect X-ray detectors with single-photon sensitivity.

Kristof Pauwels1, Paul Antoine Douissard1

  • 1ESRF - The European Synchrotron, 71 Avenue des Martyrs, Grenoble, France.

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This study demonstrates a new indirect X-ray detector with single photon sensitivity, suitable for high-flux synchrotron applications above 20 keV. This approach offers a promising alternative to current technologies for advanced X-ray detection.

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X-ray detectorsindirect detectionsCMOSscintillationsingle photons

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Area of Science:

  • Physics
  • Materials Science
  • Instrumentation

Background:

  • Next-generation synchrotron light sources demand advanced X-ray detectors capable of handling high flux and energies.
  • Current hybrid pixel detectors face limitations in cost and X-ray stopping power above 20 keV.
  • Indirect detectors offer potential for single X-ray photon sensitivity across a wide energy range.

Purpose of the Study:

  • To investigate the performance of an indirect X-ray detection approach using a sCMOS camera and a scintillator.
  • To evaluate the single X-ray photon detection limit and sensitivity of the system.
  • To provide guidelines for future development of hybrid direct-indirect X-ray detectors.

Main Methods:

  • Utilized a commercial sCMOS camera coupled with a fiber-optics plate and a Gadolinium Oxysulfide (Gd2O2S:Tb) scintillator.
  • Developed a method to assess the single X-ray photon detection limit.
  • Employed Geant4 simulations to analyze limiting factors.

Main Results:

  • Demonstrated single X-ray photon sensitivity for the indirect detector system above 20 keV.
  • Identified key performance parameters and limiting factors through experimental evaluation and simulation.
  • Established the viability of this indirect detection method for demanding applications.

Conclusions:

  • The investigated indirect X-ray detector shows promising performance for high-energy, high-flux applications.
  • This approach offers a cost-effective and sensitive alternative to current technologies.
  • Future research should focus on optimizing detector design for combined direct and indirect detection advantages.