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Radiation leakage through electron applicators on Clinac-1800 accelerators
1Department of Radiation Oncology, University of Rochester Cancer Center, New York 14642.
Medical Physics
|July 1, 1990
Summary
Radiation leakage from Varian Clinac-1800 electron beams through applicators was measured. Significant leakage was found under applicator corners and mounting ports, highlighting the need for shielding solutions.
Area of Science:
- Medical Physics
- Radiation Oncology
Background:
- Electron beam therapy is a crucial modality in radiation oncology.
- Accurate dose delivery requires minimizing radiation leakage from treatment دستگاهs.
Purpose of the Study:
- To quantify radiation leakage through electron beam applicators.
- To identify areas of high leakage from a Varian Clinac-1800.
- To investigate potential shielding solutions.
Main Methods:
- Film dosimetry was used to measure radiation leakage.
- Measurements were performed for 6-, 9-, 12-, 16-, and 20-MeV electron beams.
- Leakage was assessed at various positions relative to the central axis and source-to-film distance.
Main Results:
- High radiation leakage was detected under applicator corners and touch-plate mounting port holes.
- Leakage levels reached up to 13% on the patient plane and 35% under applicator corners.
- Up to 18% leakage was measured near mounting port holes.
Conclusions:
- Significant radiation leakage occurs through electron beam applicators.
- Specific areas, such as applicator corners and mounting ports, are prone to higher leakage.
- Simple shielding strategies are proposed to mitigate this radiation exposure.