Definition of the words and understanding

What is 'radioactivity', 'radiation' and ' radioactive materials' ?

I wonder of those scientific complicated words and tried to make them clear.


Radioactivity ; It's "radioactive decay"

Radiation ; Having sufficient energy travels outward in straight lines in all directions from the source.

Radioactive materials ; Emission from nuclei as a result of nuclear instability.

Nuclear plants in Japan


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