radi - rama
- radial electrostatic field analyser
- radiance
- radiance temperature
- radiant emissivity
- radiant energy
- radiant energy density
- radiant exposure
- radiant flux
- radiant intensity
- radiant particles
- radiant plume
- radiant power per solid angle
- radiant quantity
- radiation
- radiation chemistry
- radiation counter
- radiation detector
- radiation energy
- radiation pulses
- radiation quantities
- radiation sources
- radiation spectrometer
- radiation spectrum
- radiationless transition
- radiative capture
- radiative de-excitation
- radiative excitation
- radiative processes
- radiative recombinations
- radiative transitions
- radio-reagent
- radioactive
- radioactive age
- radioactive chain
