Half Life.

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Presentation transcript:

Half Life

Half Life (t1/2) No two radioisotopes decay at the same rate Half Life is the time required for half of the atoms of a radioactive nuclide to decay

Modern Chem Pg. 688 Radium-226 has a half-life of 1599 years Figure 7 Radium-226 has a half-life of 1599 years Half of a given amount of Radium-226 decays in 1599 years In another 1599 years, half of the remaining radium-226 decays This process occurs until the amount of the isotope is negligible

Phosphorus-32 has a half-life of 14. 3days Phosphorus-32 has a half-life of 14.3days. How many milligrams of phosphorus-32 remain after 57.2 days if you start with 4.0 mg of the isotope? Given: Initial mass = 4.0mg T1/2 = 14.3 days Time = 57.2 days Unknown: Final Mass after 57.2 days To determine the number of milligrams of phosphorus- 32 remaining, we must first find the number of half-lives that have passed in the time elapsed