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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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Presentation Transcript
radioisotopes2
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
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.

slide5
The more slowly an isotope decays the

more slowly the alpha, beta, or gamma

radiation is produced.

sample problems
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

answer
Answer
  • 0.469 mg
sample 2
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?
answer9
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