...this is Madame Curie killing herself
by discovering RADIUM.
The Big Bang Theory Season 6, Episode 4
♪ Of a RADIUM in a lead jar...
The Big Bang Theory Season 12, Episode 23
♪ Six times ten to the eighth
atoms of RADIUM ♪
The Big Bang Theory Season 12, Episode 23
bathed in the glow of their love
and the RADIUM
The Big Bang Theory Season 5, Episode 16
♪ If the half-life of RADIUM
should happen to pass ♪
The Big Bang Theory Season 12, Episode 23