Chernyaev Alexandr Petrovich RussiaMoscowMoscow State University. M.V. Lomonosov, 119991, Russian Federation, Moscow, Leninskie gory, 1заведующий кафедройa.p.chernyaev@yandex.ru Author's articles Effect of Secondary Particles with High Linear Energy Transfer on Photon Beam Quality Factor Calculation and Approximation of Radial Dose Function of Iridium Sources Training of Medical Physicists for Clinical Bases in Lomonosov Moscow State University