Don't you worry about the residual RADIUM
from the luminous dials?
The Big Bang Theory Season 2, Episode 1
♪ If the half-life of RADIUM
should happen to pass ♪
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
Madam Curie's discovery of RADIUM
turned out to have great potential...
The Big Bang Theory Season 1, Episode 2