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Related Experiment Videos

Thin CdTe detector in diagnostic x-ray spectroscopy.

Satoshi Miyajima1

  • 1Graduate School of Medicine, Course of Health Sciences, Osaka University, 1-7 Yamadaoka, Suita, Osaka, Japan, 565-0871. satoshi@sahs.med.osaka-u.ac.jp

Medical Physics
|May 30, 2003
PubMed
Summary

Thin cadmium telluride (CdTe) Schottky diode detectors are effective for diagnostic X-ray spectroscopy. Their response functions accurately correct spectra without needing carrier trapping corrections.

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Area of Science:

  • Medical Physics
  • Materials Science
  • Spectroscopy

Background:

  • Diagnostic X-ray spectroscopy requires accurate spectral measurements.
  • Cadmium telluride (CdTe) detectors offer potential for X-ray detection.
  • Understanding detector response functions is crucial for spectral analysis.

Purpose of the Study:

  • To investigate the response of a 1 mm thick CdTe Schottky diode detector in diagnostic X-ray spectroscopy.
  • To evaluate the necessity of correcting for carrier trapping effects in CdTe detectors for this application.
  • To develop and validate response functions that account for relevant physical processes.

Main Methods:

  • Utilized a 1 mm thick CdTe Schottky diode detector.
  • Irradiated the detector with monoenergetic photons from 241Am and 133Ba calibration sources.

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  • Calculated detector response functions, including primary X-ray transmission and secondary X-ray escape (K-fluorescent, Compton-scattered).
  • Compared corrected X-ray spectra with reference spectra from a high-purity germanium detector.

    • Main Results:

    • Carrier trapping (tailing) effects were minimal in the gamma-ray spectra.
    • Response functions incorporating X-ray transmission and escape provided accurate spectral corrections.
    • Corrected spectra using the CdTe detector showed good agreement with high-purity germanium detector spectra.

    Conclusions:

    • Correction for carrier trapping is not essential for thin CdTe detectors in diagnostic X-ray spectroscopy.
    • CdTe Schottky diode detectors are suitable for accurate X-ray spectral analysis in this field.
    • The developed response functions effectively account for significant distortion mechanisms.