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Technical note: on cerrobend shielding for 18-22 MeV electron beams.

Jadwiga B Wojcicka¹, Rafael Yankelevich, Barry Leonard Werner

¹Department of Radiation Oncology, Suite 94, York Cancer Center, 25 Monument Road, York, Pennsylvania 17403, USA. jwojcicka@wellspan.org

Medical Physics

|November 4, 2008

Summary

This study determined the optimal depth for measuring electron beam block transmission factors and quantified transmission levels through Cerrobend. Results show maximum transmission occurs at shallow depths, necessitating additional shielding for higher energy beams.

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Area of Science:

Medical Physics
Radiation Oncology

Background:

Accurate measurement of block transmission factors is crucial for effective radiation shielding in electron beam therapy.
Understanding electron beam transmission through shielding materials like Cerrobend is essential for dose calculation accuracy.

Purpose of the Study:

To determine the optimal depth for measuring block transmission factors in electron beams.
To quantify the transmission levels of 18 and 22 MeV electron beams through Cerrobend shielding blocks.
To analyze the impact of beam energy and cone size on block transmission.

Main Methods:

Ionization profiles and central axis distributions were measured in a water phantom for 18 and 22 MeV electron beams.
Measurements were conducted across various cone sizes (6x10 cm² to 25x25 cm²).
Bremsstrahlung components from the block and treatment head were analyzed separately.

Main Results:

Maximum block transmission for both 18 and 22 MeV electron beams occurred at depths between 0.4 and 0.7 cm on the central axis.
Maximum transmission ranged from 6.2% to 11.3% depending on beam energy and cone size.
For a 22 MeV beam, 2.95 cm and 1.4 cm of Cerrobend were needed to reduce transmission to 5% and 10%, respectively.

Conclusions:

The block transmission factor should be defined at the shallower depth where maximum dose occurs under a blocked electron beam.
Electron beams of 18 MeV and higher require additional shielding to reduce block transmission to 5% on the central axis.
These findings aid in optimizing shielding design and dose calculations in electron beam radiotherapy.