Evaluating the radiation contamination dose around a high dose per pulse intraoperative radiotherapy accelerator: a Monte Carlo study

Aim:In this study, the radiation contamination dose (RCD) for different combinations of electron energy/distance, applicator and radius around the light intraoperative accelerator (LIAC), a high dose per pulse dedicated intraoperative electron radiotherapy machine, has been estimated. Being aware ab...

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Bibliographic Details
Published in:Journal of radiotherapy in practice 2020-09, Vol.19 (3), p.265-276
Main Authors: Hosseini Aghdam, Seyed Rashid, Siavashpour, Zahra, Aghamiri, Seyed Mahmoud Reza, Mahdavi, Saied Rabie, Nafisi, Nahid
Format: Article
Language:English
Subjects:
Atoms & subatomic particles
Computer simulation
Contamination
Digital music
Dosimeters
Dosimetry
Electron accelerators
Electron beams
Electron energy
Monte Carlo simulation
Nuclear particles
Original Article
Parameters
Patients
Polymethyl methacrylate
Radiation
Radiation dosage
Radiation therapy
Simulation
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Summary:Aim:In this study, the radiation contamination dose (RCD) for different combinations of electron energy/distance, applicator and radius around the light intraoperative accelerator (LIAC), a high dose per pulse dedicated intraoperative electron radiotherapy machine, has been estimated. Being aware about the amount of RCDs is highly recommended for linear medical electron accelerators.Methods and methods:Monte Carlo Nuclear Particles (MCNP) code was used to simulate the LIAC® head and calculate RCDs. Experimental RCDs measurements were also done by Advanced Markus chamber inside a MP3-XS water phantom. Relative differences of simulations and measurements were calculated.Result:RCD reduction by distance from the machine follows the inverse-square law, as expected. The RCD was decreased by increasing angle from applicator walls opposed to the electron beam direction. The maximum differences between the simulation and measurement results were lower than 3%.Conclusions:The RCD is strongly dependent on electron beam energy, applicator size and distance from the accelerator head. Agreement between the MCNP results and ionometric dosimetry confirms the applicability of this simulation code in modelling the intraoperative electron beam and obtaining the dosimetric parameters. The RCD is a parameter that would restrict working with LIAC in an unshielded operative room.
ISSN:1460-3969
1467-1131
DOI:10.1017/S1460396920000084