In the Italian multidisciplinary BNCT project sponsored by MIUR, a series of Monte Carlo simulations have been carried out to evaluate the possibility . to irradiate patients with brain malignant gliomas at the TAPIRO 5 kW fast reactor. By means of an epithermal column mounted on one side of the care and a realistic anthropomorphic phantom placed at the column exit window in the side-of-cranium irradiation position, the MCNP calculations show the possibility to obtain a therapy beam able to fulfil all the BNCT requirements. In the column design, the study of the neutron reflector collimator becomes necessary to optimise the epithermal flux level, the beam quality and the collimation of the neutrons at the exit window. This report develops a parametric study focused on: . the relative lengths of the nickel reflector and lead collimator tracts; . the shape of the lead collimator that permits to minimise the treatment lime (about 50 min far a single beam irradiation); . the opportunity to utilise a protuberance at the exit window for the patient comfort during irradiation; . some technical aspects concerning the material adopted for the collimator construction.
|Titolo:||Geometrical Design of the Neutron Reflector - Collimator used in the TAPIRO Facility to treat Brain Gliomas by the BNCT Technique|
|Data di pubblicazione:||17-feb-2004|
|Appare nelle tipologie:||5.2 Documento in Garanzia della Qualità|