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Half-Life

[http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_17/FG17_04-02d.JPG]. Half-Life. Time it takes half of the atoms in a radioactive sample to decay into other atoms. Click Here for Half-Life Demo.

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Half-Life

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  1. [http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_17/FG17_04-02d.JPG][http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_17/FG17_04-02d.JPG]

  2. Half-Life • Time it takes half of the atoms in a radioactive sample to decay into other atoms. Click Here for Half-Life Demo [http://wps.prenhall.com/wps/media/objects/602/616516/Media_Assets/Chapter22/Text_Images/FG22_02.JPG]

  3. [http://regentsprep.org/Regents/earthsci/graphics/raddecay2.jpg][http://regentsprep.org/Regents/earthsci/graphics/raddecay2.jpg] [http://www.compumike.com/science/halflifeu238.gif]

  4. Half-Life • The length of a half-life is related to how active the elements are. (This is measured in curies)

  5. Half-Life • Problem: • If 13153I has a half-life of 8.04 days, how long will it take until only 25% of it is left?

  6. Half-Life • 2 half-lives = 8.04 + 8.04 • 16.08 days

  7. Half-Life • Problem: • If a fossil only has 12.5% of 146C remaining, how old is it? • 5730 x 3 = 17190 years

  8. Half-Life • Problem: • If you start with 25 grams of 13354Xe, which has a half-life of 5.25 days, how much will be left after 15.75 days?

  9. Half-Life Click Here for Radioactive Dating Game

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