Definition of artficial and natural radioactivity

The key difference between natural and artificial radioactivity is that natural radioactivity takes place on its own in nature whereas when it is induced by man in laboratories, it is called artificial radioactivity.

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The spontaneous emission of radiations from an unstable nuclei is known as natural radioactivity. on the other hand, The process of emission of radiations from naturally occurring isotopes when they are bombarded with sub-atomic particles or high levels of X-rays or gamma rays called artificial radioactivity.