Demonstration of polarization behavior of TlBr x-ray imager with silver electrodes

Katsuyuk Takagi, Kohei Toyoda, Hiroki Kase, Toshiyuki Takagi, Kento Tabata, Tsuyoshi Terao, Hisashi Morii, Akifumi Koike, Toru Aoki, Mitsuhiro Nogami, Keitaro Hitomi

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


This study demonstrates a result of polarization effect of an X-ray imager that uses TlBr detectors with silver small electrodes. Although TlBr detectors are suitable for X-ray imaging applications because of the associated large attenuation coefficients and direct conversion behavior, realizing a flat-panel detector with TlBr involves developing processes. The demonstrated imager is constructed utilizing a combination of existing technologies; it comprises a plate electrode containing thallium metal to suppress the polarization phenomenon, pixelated silver electrodes with 80 μm pitch, and a photon-counting-Type readout integrated circuit that can work in the hole as well as electron collection modes. As a result, it was reconfirmed that the polarization phenomenon is a serious problem for small electrodes as well as for large electrodes. In addition, the polarization could have accelerated by high X-rays flux. This result can motivate the development of polarization-Tolerant small electrodes for TlBr detectors.

Original languageEnglish
Title of host publicationHard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIII
EditorsNerine J. Cherepy, Michael Fiederle, Ralph B. James
ISBN (Electronic)9781510645141
Publication statusPublished - 2021
EventHard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIII 2021 - San Diego, United States
Duration: 2021 Aug 12021 Aug 5

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceHard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIII 2021
Country/TerritoryUnited States
CitySan Diego


  • Semiconductor radiation detector
  • Thallium bromide
  • X-ray imaging


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