Study on electrode design of PDP-like X-ray detector for enhancement of charge multiplication

Sangheum Eom, Jongseok Kim, Jungwon Kang, Hakjae Lee, Kisung Lee

Research output: Contribution to journalArticlepeer-review


In this article, a two-dimensional detector based on plasma display technology was investigated as a candidate for a flat-panel radiation detector. By using the three-dimensional Garfield code, the dependence of the electric field and multiplication on various electrode structures was examined. Based on the calculation of multiplication, three different electrode designs, including CAC, ridged CAC, and double-ridged CAC structures were selected and prototype detectors adopting these designs were fabricated and tested. The performance of these detectors was evaluated by measuring the charge density and sensitivity. The charge density of the double-ridged CAC detector during the X-ray for the on condition varied from 0.482 up to 2.59 μC/cm2 at the address bias scope of -500 - 1500V, while the cathode voltage was locked at - 400 V. The sensitivity of the same detector was 0.596 nC/mR.cm2 in an electric field of 0.54 V/μm, which was the highest value. This was about one-third lower than the sensitivity of the amorphous selenium (a-Se) based detector at 10 V/μm.

Original languageEnglish
Pages (from-to)60-66
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Publication statusPublished - 2015 Jun 1

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. NRF-2014R1A2A1A11054362).

Publisher Copyright:
© 2014 Elsevier B.V. All rights reserved.


  • Gas-filled detectors
  • Radiation detectors
  • Sensors
  • X-ray
  • X-ray detectors

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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