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2. Half-life is the time taken for the count rate to fall to half of its original reading. There are a number of ways to define half-life. Remember one of the above definitions, it may be useful in the exams. An Explanation of Half-life. A radioactive material will have some nuclei that are stable and some that are unstable.
It is a characteristic unit for the exponential decay equation. The term half-life may generically be used to refer to any period of time in which a quantity falls by half, even if the decay is not exponential. The table on the right shows the reduction of a quantity in the number of half-lives elapsed.