Radioactive half life
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The number of radioactive nuclei in a sample of a given isotope decreases exponentially with time.
Half-life is the time required for half of the radioactive nuclei in a sample to decay.
The half-life of radioactive nuclei is independent of both the physical state and the chemical state of the material.
The activity of a radioactive substance is the number of radioactive nuclei that decay per unit time.
The range of products of nuclear decay, some with long half-lives, means that nuclear waste must be stored for long periods.
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