An accurate description of charged particle multiple scattering is very important for several applications ranging from the simulation of detector response to the study of dose localization in frontier techniques for radiation therapy. Unfortunately, experimental data are rare, rather old and lack a rigorous quantification of the statistical and systematic uncertainties. Recent data on multiple scattering by electrons with energies between 13 MeV and 20 MeV have been published in 2008, but, because the experimental setup was not optimized and a not well collimated beam from a medical accelerator was employed, they cannot be adopted as a reference to validate theoretical approaches and Monte Carlo codes. The present project (which is part of a more ambitious Jovem Pesquisador project, 1016/13116-5) aims at providing reference data for electron multiple scattering at energies between 10 and 100 keV, and at 1.9 MeV in an ample selection of elements. The targets will be carefully characterized with respect to: i) thickness; ii) contamination by other elements (light and heavy); and iii) local non-uniformity with a proton beam. These cares are necessary to provide, beyond the data on multiple scattering, their systematic and statistical uncertainties. The setup for the measurements between 10 and 100 keV has already been constructed and tested at the Laboratório do Acelerador Linear of IFUSP. The main emphasis of the present project are the development of the setup to be used at 1.9 MeV and the actual collection of the measurements between 10 and 100 keV, and at 1.9 MeV covering an ample combination of Z-energy-thickness of the target to include the cases where the differences between the various theoretical approaches and Monte Carlo implementations are most different.
News published in Agência FAPESP Newsletter about the scholarship: