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TlBr Films for Direct Digital Radiography.

M S Squillante1, M J Breen1, J F Christian1

  • 1Radiation Monitoring Devices, Inc., 44 Hunt St, Watertown, MA, 02472, USA.

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|June 2, 2025
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Summary
This summary is machine-generated.

Researchers developed a new thallium bromide (TlBr) detector for advanced X-ray imaging. This high-performance detector offers improved resolution for hard X-ray applications, advancing digital radiography systems.

Keywords:
ROICThallium bromidehard X-ray imagingintegrating ROICsemiconductor X-ray detector

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Area of Science:

  • Materials Science
  • Medical Imaging
  • Semiconductor Physics

Background:

  • Modern X-ray imaging systems are often limited by detector performance.
  • Current digital radiography detectors include indirect (scintillator-based) and direct (semiconductor-based) types.
  • Existing semiconductor detectors using silicon, amorphous selenium (aSe), or cadmium zinc telluride (CdZnTe) have limitations in attenuating higher energy X-rays.

Purpose of the Study:

  • To investigate the performance of thallium bromide (TlBr) films as a novel semiconductor material for hard X-ray imaging.
  • To evaluate the potential of TlBr detectors coupled with a readout integrated circuit (ROIC) for enhancing X-ray imaging capabilities.

Main Methods:

  • Development and characterization of thallium bromide (TlBr) columnar films.
  • Deposition of TlBr films onto a complementary metal-oxide-semiconductor (CMOS) readout integrated circuit (ROIC).
  • Evaluation of imaging performance, including resolution and X-ray attenuation properties.

Main Results:

  • Thallium bromide (TlBr) demonstrates high atomic number and density, making it suitable for hard X-ray detection.
  • The developed TlBr film detector achieved an image resolution of 20 μm.
  • The detector consisted of a 1 cm² × 100-μm thick columnar TlBr film deposited on a CMOS ROIC.

Conclusions:

  • Thallium bromide (TlBr) is a promising material for next-generation hard X-ray imaging detectors.
  • The TlBr/CMOS ROIC detector shows potential for improved performance in medical, research, and industrial X-ray applications.
  • Further development could lead to enhanced imaging of higher energy X-rays beyond 20 keV.