TY JOUR TI Proton Accelerators for Radiation Therapy KW proton therapy KW particle accelerators KW cyclotron KW synchrotron KW Bragg curve JO Medical Radiology and radiation safety AU Chernyaev, A.P. AU Klenov2, G.I. AU Bushmanov, A.Y. AU Pryanichnikov, A.A. AU Belikhin, M.A. AU Lykova, E.N. PY 2019 IS 64 PB Federal Medical Biological Agency of Russia