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Radioisotopes

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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Radioisotopes

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  1. Radioisotopes

  2. 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.

  3. Half Life • The half-life of a radioactive isotope is the time it takes for one half of a sample of that isotope to decay.

  4. The more slowly an isotope decays the more slowly the alpha, beta, or gamma radiation is produced.

  5. Sample Problems • Gold-191 has a half life of 12.4 hours. • What mass of this isotope would remain after 49.6 hours if you started with 7.5mg

  6. Answer • 0.469 mg

  7. Sample 2 • A sample of iodine-126 with an original mass of 15.000 mg loses 13.125 mg of the original mass in 39 days. What is the half life?

  8. Answer • 15.000mg – 13.125mg = 1.875mg 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

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