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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.
Summary
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%.
- 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.