ionizing radiation
prompt radiation
secondary radiation
ultraviolet radiation
near ultraviolet radiation
characteristic radiation
radiator
horn radiator
complete radiator
radicalradical
radio
radio-activity
broadcaster
radio receiver
radio sender
radiotelegraphic
radio telephone
radioactive
radioactivity
natural radioactivity
natural radioactivity
radiography
gamma radiography
radiogram
radioisotope
radio-carbon
radiology
radionuclide
radiotelegraph
radiotherapy
