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Half-Life of a Radioactive Element

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time t
random set
substance
technetium-98
radon-222
radium-226
uranium-235
plutonium-239
The half-life of a radioactive element is the time needed for half of the material to decay. The blue and orange points represent the original number of radioactive nuclei and those that decay; the number of blue points decreases by half at each step in time. The plot shows the population
N(t)
of radioactive nuclei at any time (in
T
1/2
units).
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