Activity & Decay Flashcards

All 3 cards in this deck

What is the activity of a radioactive source?

The number of nuclei that decay each second.

What is the unit of activity of a radioactive isotope?

The becquerel (Bq); 1 Bq = 1 decay per second.

What happens to the activity of a radioactive source as time passes?

It decreases, because fewer undecayed nuclei are left to decay.