The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

bathed in the glow of their love
and the RADIUM
The Big Bang Theory Season 5, Episode 16

♪ Of a RADIUM in a lead jar
The Big Bang Theory Season 12, Episode 23

...this is Madame Curie killing herself
by discovering RADIUM.
The Big Bang Theory Season 6, Episode 4

♪ If the half-life of RADIUM
should happen to pass ♪
The Big Bang Theory Season 12, Episode 23

Don't you worry about the residual RADIUM
from the luminous dials?
The Big Bang Theory Season 2, Episode 1