Radioisotopes. Radioisotopes. The decay of unstable isotopes is spontaneous, and takes place all the time. This was first observed by Henri Becquerel when he stored uranium ore in a drawer with photo film. Half Life. The half-life of a radioactive isotope is
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Becquerel when he stored uranium ore
in a drawer with photo film.
the time it takes for one half of a
sample of that isotope to decay.
more slowly the alpha, beta, or gamma
radiation is produced.
after 49.6 hours if you started with
15.000/2 = 7.5 That’s 3 Half Lives
7.5/2 = 3.75 39 days / 3 = 13 days
3.75/2 = 1.875