+Radioactive describes substances that emit [Radiation](/wiki/Radiation) as their unstable [Atomic Nuclei](/wiki/Atomic_Nuclei) decay. It is a fundamental process, a profound transformation of matter releasing immense energy.
+## See also
+- [Isotope](/wiki/Isotope)
+- [Decay](/wiki/Decay)
+- [Nuclear Fission](/wiki/Nuclear_Fission)
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