proton linac vertical self-shielded for proton therapy

A linear proton accelerator including a plurality of components (10) accelerator arranged one after another, said components comprising accelerator source (11) of protons and a plurality of units (15, 17) of acceleration, and further including a lattice structure (20) for supporting said components throttle, said support structure formed as a prism with a polygonal cross section being and having a plurality of side faces (21) connecting opposite ends of the prism, wherein said support structure is arranged concentrically with respect to these components throttle, said characterized throttle being that a plurality of slabs (30) of shielding material radiation shield are mounted in respective apertures (23) formed in said side faces of the support structure.