Which of the following would be a suitable definition of a half-life?
A) the amount of time it takes half of the patients to die after an exposure to an amount of radiation
B) half the amount of time it takes for a sample to completely lose its background radioactivity.
C) half the amount of time it takes for an isotope to completely decay
D) the amount of time it takes an isotope to decay to half its original amount
E) the amount of time it takes until half of the penetrating power is gone from the sample.
Correct Answer:
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