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Definition of "Half Life" |
The period required for half of the atoms of a particular radioactive isotope to decay and become an isotope of another element. |
Definition of "half-life" |
The time taken for the activity of a radioactive isotope to decay to half of its original value. In other words the time taken for half the atoms present to disintegrate. / the average time needed for half the nuclei of a radioactive element to decay. |
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