1 Dr. Sandro Sandri (President of Italian Association of Radiation Protection, AIRP) Head, Radiation Protection Laboratory, IRP FUAC Frascati ENEA – Radiation Protection Istitute [email protected]12th International Symposium on Radiation Physics 07 to 12 October 2012 - Rio de Janeiro - RJ THE RADIATION FIELDS AROUND A PROTON THERAPY FACILITY: A COMPARISON OF MONTE CARLO SIMULATIONS
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Dr. Sandro Sandri ( President of Italian Association of Radiation Protection , AIRP)
THE RADIATION FIELDS AROUND A PROTON THERAPY FACILITY: A COMPARISON OF MONTE CARLO SIMULATIONS. Dr. Sandro Sandri ( President of Italian Association of Radiation Protection , AIRP) Head, Radiation Protection Laboratory , IRP FUAC Frascati ENEA – Radiation Protection Istitute - PowerPoint PPT Presentation
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Dr. Sandro Sandri(President of Italian Association of Radiation Protection, AIRP)Head, Radiation Protection Laboratory, IRP FUAC FrascatiENEA – Radiation Protection Istitute [email protected] 12th International Symposium on Radiation Physics
07 to 12 October 2012 - Rio de Janeiro - RJ
THE RADIATION FIELDS AROUND A PROTON THERAPY FACILITY: A COMPARISON OF MONTE CARLO SIMULATIONS
CONTENTS
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• The TOP-IMPLART• Scope of the analysis• Simulation model• The computer codes• Results• Discussion and conclusion
TOP-IMPLART accelerator
• TOP-IMPLART are the acronym of Terapia Oncologica con Protoni (Oncological Therapy with Protons) and Intensity Modulated Proton Linear Accelerator for Therapy
• The first 7 MeV module of the accelerator, is already installed and has been tested• Additional modules will be added leading proton energy to 30, 70 and 150 MeV• In the final layout the bunker will be 30 m long and 3 m wide
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COMPUTER CODES
• The principal subject of the current work is the analysis of the performance of two different computer codes
• both based on the Monte Carlo algorithm:• FLUKA (FLUktuierende KAskade) and• MCNPX (Monte Carlo N-Particle eXtended)
• Info on the web sites:• www.fluka.org• mcnpx.lanl.gov
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SIMULATION MODEL
• The model has been developed to simulate a 150 MeV proton beam
• hitting a water phantom of cubic form, 32 cm thick (32x32x32 cm3)
• with 2 mm plexiglass walls• and located in front to the kapton membrane, 50 µm thick,
that seals the vacuum chamber of the accelerator• Between the kapton membrane and the phantom there is a 2
cm air gap• The cross section of the proton beam reaching the kapton
membrane has the maximum dimension of 7 mm (in x and y directions)
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Due to the different units, the qualitative path only can be compared in the graphs,showing a good agreement
FLUKA, Neutron fluence, spatial distribution
Neutrons are more intense in the forward direction, as foreseeableS. Sandri - 12th International Symposium on Radiation Physics - Rio de Janeiro - RJ 13
CONCLUSIONS
• Both computer codes used in the simulation are well suitable to be applied to the analysis of the secondary radiation produced by the proton beam of the TOP-IMPLART accelerator
• While MCNPX seems to be more flexible in the data library selection and update, FLUKA can provide a more complete output in term of graphical detail
• Another advantage of MCNPX is the availability of versions developed to run on the world wide diffused Windows™ personal computer, on the other hand FLUKA can be installed on a pc with Linux system
• The results obtained with the two codes showed a good agreement for the fluence vs energy spectra of the neutrons (the main secondary radiation)
• In conclusion both the codes are appropriate for the specific calculation and the selection should be mainly based on the hardware and operative system availability, and on the specific skilfulness of the users
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