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Cesium-137 source strength verification.

R Yankelevich1, J B Wojcicka, V Maier

  • 1Penn State Geisinger Health System, Danville 17822-2003, USA.

Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists
|April 7, 2000
PubMed
Summary
This summary is machine-generated.

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Cesium-137 source calibration protocols have been revised. Verification revealed clinical cesium tubes issued before 1979 had activity differences exceeding 5%, necessitating individual adjustments.

Area of Science:

  • Medical Physics
  • Radiological Calibration
  • Nuclear Medicine

Background:

  • Cesium-137 (Cs-137) source calibration protocols have evolved due to updated data.
  • The 3M Corporation revised its calibration protocol and issued product alerts in the early 1980s.

Purpose of the Study:

  • To verify the activity of clinically used Cesium-137 tubes.
  • To assess the accuracy of historical Cesium-137 source calibrations against updated data.

Main Methods:

  • Activity verification of clinical Cesium-137 sources.
  • Comparison of verified activity with manufacturer-stated activity (3M Corporation).

Main Results:

  • Discrepancies between verified and stated activity for Cesium-137 tubes issued before 1979 ranged from 6% to 13%.

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  • These differences exceeded the 5% adjustment recommended by 3M.

    • Conclusions:

    • Individual verification and adjustment of Cesium-137 tube activity are recommended for sources issued before 1979.
    • Historical calibration data may require re-evaluation for clinical applications.