Speaker
Description
Proton beam therapy has demonstrated over the past 50 years clear advantages compared to conventional radiotherapy. However, the use of high energy protons results in the production of complex mixed secondary neutron and photon fields. The shielding calculations and activation studies require the use of complex computation codes such as the MCNP6 and the FISPACT-2 codes. The use of those codes will be illustrated in the case of the ProteusONE system developed by IBA.
Based upon the use of a superconducting synchrocyclotron (S2C2) delivering 230 MeV proton beams, ProteusONE is a compact PT system with a single treatment room equipped with a compact gantry.
ProteusONE shielding design is based on a detailed patient case mix including a limited number of representative clinical indications and realistic QA activities. It is entirely performed with MCNP6 Monte Carlo simulations including detailed modellings of the concrete vault, the S2C2 cyclotron and the compact gantry. The MC calculations have been validated with a radiation survey performed with an extended-range WENDI-2 rem meter.
Detailed activation studies have also been performed for all aspects of the facility like the cyclotron, the beamline and the concrete walls. A low-activation concrete (LAC) has been developed in collaboration with SCK-CEN in Belgium, reducing considerably the amount of activated concrete generated after 20 years of usage. The LAC has been successfully implemented in several ProteusONE Facilities
