radioactivity; radiation; radioactive material
radiative cooling; radiational cooling
flame-throwing tank; flame tank
positron emission tomography; PET
black body; blackbody; Planckian radiator; full radiator; perfect radiator
bremsstrahlung; X-rays produced when fast electrons pass through matter
obsession with radiation effects (esp. after the 2011 tsunami and Fukushima reactor problems); person obsessed with radiation; (lit.) radiation brain
radiation zone (within the sun)
actinomyces; actinomycetes; ray fungus