Minimizing entrance door thickness for direct-entry radiotherapy rooms

Area of Science:

• Medical Physics
• Radiation Oncology
• Architectural Engineering

Background:

• Medical linear accelerator rooms often require heavy, costly doors (50 cm thick, 10,000 kg, $50-60k) when lacking entrance mazes.
• Standard room designs necessitate substantial shielding for entrance doors to mitigate radiation exposure.

Purpose of the Study:

• To present an alternative medical linear accelerator room design that reduces door thickness and associated costs.
• To explore the impact of therapy unit orientation and supplementary shielding on door requirements.

Main Methods:

• The study proposes orienting the therapy unit 180 degrees from the conventional position.
• A short stub wall is incorporated to attenuate secondary radiation leakage, shielding the entrance door.

Main Results:

• The proposed design allows for a reduction in door thickness by approximately 50%.
• This reduction leads to significant cost savings for the entrance doors.
• Long-term maintenance benefits for motor-driven doors are also anticipated.

Conclusions:

• The novel room design offers a cost-effective solution for medical linear accelerator facilities.
• Optimized unit orientation and stub wall shielding provide substantial savings in door construction and maintenance.