Half-life
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The period during which half of the nuclei decay in
a quantity of radionuclides. There are extreme variations in the half-lives
of the various radionuclides, e.g. from 7.2·1024years
for tellurium-128 down to 2·10-16 seconds for beryllium-8.
The following relationships exist between the half-life T, the decay
constant and the average lifetime:


Decay curve of tritium (H-3) - Half-life 12.3 years
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