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

Published online by Cambridge University Press:  26 February 2020

Seyed Rashid Hosseini Aghdam Open the ORCID record for Seyed Rashid Hosseini Aghdam [Opens in a new window] ,
Zahra Siavashpour ,
Seyed Mahmoud Reza Aghamiri ,
Saied Rabie Mahdavi  and
Nahid Nafisi
Seyed Rashid Hosseini Aghdam
Affiliation:
Radiation Medicine Department, Shahid Beheshti University, Tehran, Iran
Zahra Siavashpour
Affiliation:
Radiotherapy Oncology Department, Shahid Beheshti Medical University, Tehran, Iran
Seyed Mahmoud Reza Aghamiri
Affiliation:
Radiation Medicine Department, Shahid Beheshti University, Tehran, Iran
Saied Rabie Mahdavi*
Affiliation:
Medical Physics Department, Iran University of Medical Science, Tehran, Iran
Nahid Nafisi
Affiliation:
Surgery Department of Rasool Akram Hospital, Iran University of Medical Science, Tehran, Iran
*
Author for correspondence: Saied Rabi Mahdavi, Medical Physics Department, Iran University of Medical Science, Tehran 14496141525, Iran. Tel: 982188622647. Fax: 982188622647. E-mail: [email protected]
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Abstract

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.

Keywords

IORTLIACMonte Carlo simulationRadiation contamination dose
Type
Original Article
Information
Journal of Radiotherapy in Practice , Volume 19 , Issue 3 , September 2020 , pp. 265 - 276
Copyright
© Cambridge University Press 2020

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