![]() ![]() ![]() These radioactive atoms release energy to become new, different types of atoms at some measurable rate known as radioactive decay.Īll radioactive materials have unstable nuclei within them these are nuclei that will decay. This also implies that one half life is the time that it takes for the activity of a source to fall to half its original value. ![]() Half life is the time that it takes for half of the original value of some amount of a radioactive element to decay. The time that it takes the mass or activity of the source (the number of decay events per second) to fall to the 50% mark is the half life. A chart showing the decay of a radioactive nucleus over time.
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