Journal of Medical Physics
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Year : 2022  |  Volume : 47  |  Issue : 1  |  Page : 27-33

Design and evaluation of structural shielding of a typical radiotherapy facility using egsnrc monte carlo code

1 Department of Radiation Biology and Radiotherapy, College of Medicine, University of Lagos, Idi-Araba, Lagos, Nigeria
2 Department of Physics, University of Lagos, Akoka, Lagos, Nigeria
3 Department of Radiotherapy, Mercelle Ruth Cancer Centre and Specialist Hospital, Ikoyi, Lagos, Nigeria

Correspondence Address:
Dr. Zaccheaus Ayo Ibitoye
Department of Radiation Biology and Radiotherapy, College of Medicine, University of Lagos, Idi-Araba, Lagos
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jmp.jmp_76_21

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Purpose: This study aimed to evaluate the shielding integrity of a typical radiotherapy facility using the Monte Carlo (MC) method. Materials and Methods: EGSnrc MC code was used to design a radiotherapy bunker with appropriate materials and thicknesses. A concrete density of 2.36 g/cm3 was used as a shielding material for primary and secondary barriers. The lead slab was used in the entrance door. The complex geometries of the bunker were modeled by using the egs++ application code embedded in the software. Phase-space generated from a linac machine built with BEAMnrc codes was used as a source of 18 MV X-ray beam set at 100 cm source–surface distance with a field size of 40 cm × 40 cm. Energy deposited in each geometrical region was evaluated and analyzed. Results: Energy deposited at the entrance door, supervised and controlled areas were found to be approximately 0%. No significant difference in the energy deposition on the geometries was observed when the gantry angles were set at either 90° or 270° (P = 1). Conclusion: The findings in this study revealed that the EGSnrc MC code can be used as a veritable tool in the design and evaluation of structural shielding efficiency in a radiotherapy facility.

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