geiger counter

Pronunciation

Noun B2 Upper-intermediate

An instrument that detects and measures ionising radiation, usually by producing an audible click for each particle detected.

"The geiger counter clicked rapidly as they approached the old radioactive dial from the watch factory."

Test yourself

Which word fits the gap? "The _____ clicked rapidly as they approached the old radioactive dial from the watch factory."

Answer: geiger counter

In your own words, what does "geiger counter" mean?

An instrument that detects and measures ionising radiation, usually by producing an audible click for each particle detected.