Conversion gain fluctuation in electron-hole pair creation

Swank factor of CdZnTe

G. L. Khym, Kihyun Kim, S. U. Kim, Hyung Jin Yang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Cadmium zinc telluride (CdZnTe) is currently of interest as a photoconductor in direct conversion digital X-ray medical imaging. A critical performance parameter of an X-ray detector is the Swank factor for degradation of the signal to noise ratio, or zero spatial frequency detective quantum efficiency, due to conversion gain fluctuation in electron-hole pair creation. Based on the measured electron-hole pair creation energy and energy band gap, the Swank factor is evaluated by the Markov process. At incident X-ray energy below the K-edge of Cd, the Swank factor is nearly 1.0. At higher energy above the K-edge of Cd, however, the Swank factor is largely affected by the escape of Cd/Te characteristic X-rays, If the photon energy is below the K-edge of Cd, the fluctuation in EHP creation has almost no influence on detector performance.

Original languageEnglish
JournalJournal of the Korean Physical Society
Volume45
Issue numberSUPPL.
Publication statusPublished - 2004 Dec 1

Fingerprint

zinc tellurides
cadmium tellurides
x rays
Markov processes
photoconductors
energy
detectors
escape
energy bands
quantum efficiency
signal to noise ratios
degradation
photons

Keywords

  • CdZnTe
  • Detective Quantum Efficiency
  • DQE
  • High resistivity
  • Monte Carlo method
  • Polycrystalline
  • Swank factor

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Conversion gain fluctuation in electron-hole pair creation : Swank factor of CdZnTe. / Khym, G. L.; Kim, Kihyun; Kim, S. U.; Yang, Hyung Jin.

In: Journal of the Korean Physical Society, Vol. 45, No. SUPPL., 01.12.2004.

Research output: Contribution to journalArticle

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