Radiation shielding for gamma stereotactic radiosurgery units

Area of Science:

• Medical Physics
• Radiation Oncology
• Health Physics

Background:

• Gamma stereotactic radiosurgery units present unique shielding design challenges due to highly anisotropic radiation patterns.
• Manufacturers provide shielding data but do not perform custom calculations for end-users.
• Over 237 gamma stereotactic radiosurgery units are installed globally, necessitating independent shielding design methods.

Purpose of the Study:

• To introduce a rigorous and conservative method for barrier design in gamma stereotactic radiosurgery treatment rooms.
• To provide a practical solution for healthcare facilities installing or upgrading gamma radiosurgery units.

Main Methods:

• Development of a shielding design methodology consistent with U.S. National Council on Radiation Protection and Measurements Report No. 151 principles.
• Implementation using a simple electronic spreadsheet for efficient calculation of radiation levels.
• Calculation of radiation levels on planes parallel to and 0.3 m outside treatment room barriers.

Main Results:

• The proposed method offers a rigorous and conservative approach to shielding barrier design.
• A spreadsheet-based tool can be set up in approximately 1 hour.
• The tool provides accurate radiation level estimations for effective shielding design.

Conclusions:

• The presented shielding design method is practical and effective for gamma stereotactic radiosurgery facilities.
• This approach empowers centers to independently manage shielding design for new or existing units.
• The spreadsheet tool facilitates rapid and reliable radiation level assessment for barrier planning.