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What is radiation?

How do radioactivity and radiation differ?

Radioactivity and radiation are different.
Radioactivity and radiation
Radioactivity indicates the property of an unstable atomic nucleus changing (decaying) into a different atomic nucleus and emitting radiation...

In other words, decay of the atomic nucleus...

For that reason, the intensity of radioactivity is expressed as the number of atomic nuclei that decay per second. The intensity of radioactivity and the intensity of radiation are not the same.

Decay of 1 nucleus per second = 1 becquerel
decay of a atomic nucleus

Model of decay of a 60Co atomic nucleus