TY JOUR TI Radiobiological Proton Effects KW protons KW RBE KW Bragg peak KW central nervous system KW hematopoiesis KW chromosomal aberrations KW survival KW radioprotective agents KW radiation therapy KW space radiation KW mice KW rat JO Medical Radiology and radiation safety AU Ivanov, A.A. AU Bichkova, T.M. AU Nikitenko, O.V. AU Ushakov, I.B. PY 2019 IS 64 PB Federal Medical Biological Agency of Russia