Radioactivity - Activity and half-life

4 important questions on Radioactivity - Activity and half-life

How do you measure the activity of the radioactive source?

A Geiger counter

What is the activity of the radioactive source?

The number of atomic nuclei that decay every second.

What is the unit of activity?

The Becquerel (Bq)
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What is the decay curve?

A graph that plots the activity of an amount of substance against time. You can read off the half-life of a radioactive substance from the decay curve.

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