имя существительное [физика, сокращение] R, r рентген (внесистемная единица дозы рентгеновского и гамма-излучений)
1) рентген 2) рентгеновский
рентген, Р
biographical name — see rontgen
I. adjective Etymology: International Scientific Vocabulary, from Wilhelm Röntgen of or relating to X-rays Example: roentgen examinations II. noun the international unit of x-radiation or gamma radiation equal to the amount of radiation that produces in one cubic centimeter of dry air at 0°C and standard atmospheric pressure ionization of either sign equal to one electrostatic unit of charge