That stuff's RADIOACTIVE.
The Big Bang Theory Season 6, Episode 8
like a RADIOACTIVE monster!
The Big Bang Theory Season 7, Episode 20
If Batman were bitten by a RADIOACTIVE
Man-Bat,
The Big Bang Theory Season 9, Episode 21
...so, you know,
I could separate RADIOACTIVE isotopes.
The Big Bang Theory Season 1, Episode 16
I wonder if Howard
used a RADIOACTIVE tracer.
The Big Bang Theory Season 4, Episode 18