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CdZnTe detector in diagnostic x‐ray spectroscopy
Author(s) -
Miyajima Satoshi,
Imagawa Kotaro,
Matsumoto Masao
Publication year - 2002
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.1485975
Subject(s) - detector , monte carlo method , physics , spectroscopy , semiconductor detector , spectral line , x ray detector , distortion (music) , mean free path , optics , computational physics , scattering , optoelectronics , amplifier , statistics , mathematics , cmos , quantum mechanics , astronomy
A method to utilize CdZnTe (CZT) detectors in diagnostic x‐ray spectroscopy is described in this article. Spectral distortion due to transmission of primary x rays, the escape of cadmium‐ and tellurium‐K fluorescent x rays, and tailing was severe in measured x‐ray spectra. Therefore, correction for the distortion was performed with the stripping method using response functions. The response functions were calculated with the Monte Carlo method. The Hecht equation was employed to approximate the effects of carrier trapping in the calculations. The parameters in the Hecht equation, the mean‐free path (λ) of electrons and holes, were determined such that the tailing in calculated response functions fit that in measured γ‐ray spectra. Corrected x‐ray spectra agreed well with the reference spectra measured with an HPGe detector. The results indicate that CZT detectors are suitable for diagnostic x‐ray spectroscopy with appropriate corrections.