During my master thesis I investigated the use of innovative silicon detectors optimized for time resolution (Ultra Fast Silicon Detectors, UFSDs) to assess the beam energy of clinical proton beams. The research activity I performed is involved in the MoVeIt project of the INFN (Istituto Nazionale di Fisica Nucleare), aiming at developing new beam monitors for future treatments in charge particle therapy. The capability to detect single protons and the outstanding time resolution provided by the UFSD technology are exploited to measure protons’ time-of-flight (TOF), obtaining the energy and, consequently, the depth of penetration (i.e. the range) of the beams in the tissues.