
That stuff's RADIOACTIVE.
The Big Bang Theory Season 6, Episode 8

But wouldn't Man-Batman just be a Batman
that was bitten by a RADIOACTIVE man?
The Big Bang Theory Season 9, Episode 21

I wonder if Howard
used a RADIOACTIVE tracer.
The Big Bang Theory Season 4, Episode 18

like a RADIOACTIVE monster!
The Big Bang Theory Season 7, Episode 20

...so, you know,
I could separate RADIOACTIVE isotopes.
The Big Bang Theory Season 1, Episode 16