Radioactivity

The radioactivity leaked out of the nuclear power plant.

'Radioactivity' is a chemical term.

'Radioactivity' is a chemistry term.

As time passed, the radioactivity diminished.

What do you think of when you hear the word "radioactivity"?

How dangerous are the levels of radioactivity?

The Geiger counter is an instrument that measures radioactivity.

It was Marie Curie who discovered radioactivity.

It is well known that Pierre and Marie Curie used this new-found radioactivity to identify the new elements polonium and radium.

Today, no one would intentionally smear radioactive materials on their face, but in 1933, the dangers of radioactivity were not yet fully understood.