cosmic background RADIATION
from the singularity.
The Big Bang Theory Season 12, Episode 13
...of cosmic RADIATION at sea level,
but I don't need help.
The Big Bang Theory Season 1, Episode 12
...on the theory
of RADIATION and quanta.
The Big Bang Theory Season 4, Episode 2
...even though she would later die a slow,
painful death from RADIATION poisoning.
The Big Bang Theory Season 1, Episode 2
Switched over to high-energy
RADIATION research, had a mishap.
The Big Bang Theory Season 1, Episode 5