- Time it takes for the number of nuclei of the isotope in a sample to halve. - Time it takes for the count rate (or acitivity) of the isotope in a sample to fall to half it's initial level.

Half life@ Flashcards by Sim <3 floaties

What is half life?

Time it takes for the number of nuclei of the isotope in a sample to halve.
Time it takes for the count rate (or acitivity) of the isotope in a sample to fall to half it’s initial level.

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