LEONARD: Oh, my God,
there's a breach in the RADIATION unit.
The Big Bang Theory Season 1, Episode 11
If you guys prove the existence
of Unruh RADIATION...
The Big Bang Theory Season 7, Episode 2
Oh, I'm in a RADIATION suit.
The Big Bang Theory Season 1, Episode 11
...on the theory
of RADIATION and quanta.
The Big Bang Theory Season 4, Episode 2
Perhaps more if that RADIATION
gave you a super brain.
The Big Bang Theory Season 11, Episode 17