What is radioactivity?

Atoms of any element may have different forms (isotopes). Isotopes differ from each other by the number of neutrons in the nucleus, which is also reflected in their names, for example, Carbon-12 or Carbon-14. The nuclei of some isotopes (scientists often call them radioisotopes) are unstable and self-decomposed, releasing radiation - a stream of particles conventionally called alpha, beta and gamma rays. This is radiation.

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