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Monte Carlo-based determination of radiation leakage dose around a dedicated IOERT accelerator

  • Hamid Reza BaghaniEmail author
  • Seyed Rashid Hosseini Aghdam
  • Mostafa Robatjazi
  • Seyed Rabi Mahdavi
Original Article
  • 1 Downloads

Abstract

Evaluating the stray radiation around medical electron accelerators is a mandatory issue. Surveying the radiation leakage dose is important for patients, technicians, and health physicists, due to radiation protection aspects. Consequently, radiation leakage dose around the head of a mobile-dedicated intraoperative radiotherapy accelerator (LIAC), at different electron energies and field sizes have been evaluated in this study. More specifically, the MCNPX Monte Carlo code was used to model the LIAC head, connected applicator, and employed water phantom. Radiation leakage dose around the LIAC head was calculated for different energy and field sizes through tuning the Monte Carlo results to the practically measured doses. These measurements were performed using an Advance Markus ionization chamber inside an automated MP3-XS water phantom. The good agreement between the calculated dose distributions within the water tank and corresponding dose measurements show that the simulation model of the LIAC head is appropriate for radiation leakage assessment. The obtained radiation leakage dose distribution highly depends on the electron energy and applicator diameter. With increasing the electron energy, the leakage dose decreased, while increasing the field size increased the leakage dose. It is concluded that the rate of stray radiation and leakage dose around the LIAC head in both vertical and horizontal planes were acceptable according to the recommended radiation protection criteria. To meet the recommended dose limit (100 µSv/week for controlled areas), the maximum number of patients should be kept to four patients per week inside a standard and unshielded operating room.

Keywords

Intraoperative electron radiotherapy Radiation leakage Monte Carlo simulation Dosimetry 

Notes

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Informed consent

Informed consent was obtained from all individual participants involved in the study.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Hamid Reza Baghani
    • 1
    Email author
  • Seyed Rashid Hosseini Aghdam
    • 2
  • Mostafa Robatjazi
    • 3
  • Seyed Rabi Mahdavi
    • 4
  1. 1.Physics DepartmentHakim Sabzevari UniversitySabzevarIran
  2. 2.Radiation Medicine DepartmentShahid Beheshti UniversityTehranIran
  3. 3.Department of Medical Physics and Radiological SciencesSabzevar University of Medical SciencesSabzevarIran
  4. 4.Medical Physics DepartmentIran University of Medical SciencesTehranIran

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