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of a radionuclide.

Where decay constant ? is related to specific radioactivity a by the following equation:

Therefore, the half-life can also be described by

Example: half-life of Rb-87

One gram of rubidium-87 and a radioactivity count rate that, after taking solid angle effects into account, is consistent with a decay rate of 3200 decays per second corresponds to a specific activity of . Rubidium atomic mass

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