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Some background radiation comes from waste from...

What are cosmic rays?

What are Rocks and Soil? (background radiation)

What are living things? (background radiation)

Three ways in which human activity has contributed to background radiation.

How are tracers used in industry?

Why is gamma radiation used as an industrial tracer?

How does a smoke detector with an alpha source work?

Explain the idea of dating rocks. (Uranium and lead)

What can measurements from radioactive carbon be used to find?