Chemistry ppts. #8

Chemistry ppts. #8 - Chapter 2 Atoms and Radioactivity...

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Chapter 2 – Atoms and Radioactivity 9/1/10
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Write balanced nuclear decay equations for the following emitters: Sample Problem a) sulfur-35 ( β ) b) gallium-72 produces germanium-72 S 35 16 e 0 1 - + Cl 35 17 Ga 72 31 e 0 1 - + e G 72 32
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Radiation Units and Half-Lives Radioactive decay is measured as the number of radioactive emissions of particles ( disintegrations ), that occur in a second. The unit for measuring activity of a radioactive isotope is called the curie (Ci) .
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Radiation Units and Half-Lives The half-life of an isotope is the time it takes for 50% of the atoms in a radioactive sample to decay.
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Radioactive iodine-131 has a half-life of 8 days. If a dose with an activity of 800 μ Ci of 131 I is given to a patient, how much will still be active 40 days later? Sample Problem lives - half 5 days 8 life - half 1 days 40 = 800 μ Ci 8 days 1 half-life 400 μ Ci 200 μ Ci 16 days 2 half-lives 24 days 3 half-lives 100 μ Ci 50 μ Ci 25 μ Ci 32 days 4 half-lives 40 days 5 half-lives
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Chemistry ppts. #8 - Chapter 2 Atoms and Radioactivity...

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