It will take two decades for a radioactive isotope with a half-life of 8.45 years to decay to 81.12% of its initial mass.
Something that shows or is produced by radioactive is referred to as radioactive. Radiation, which typically manifests as electromagnetic waves or swiftly moving elementary particles like protons or neutrons, is released when anything is radioactive.
The term "radioactivity" is used to characterize the natural mechanism by which some atom spontaneously split into distinct, more stable atoms, producing both particles and energy. Because unstable isotopes frequently change into more stable isotopes, this process, also known as radioactive decay, takes place.
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