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Click Here for Half-Life Demo 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]

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

Half-Life Isotope Activity (Curies) U-235 0.00000241 Am-241 3.24 Cs-137 86.4 I-131 123,500 The length of a half-life is related to how active the elements are. (This is measured in curies)

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?

Half-Life 2 half-lives = 8.04 + 8.04 16.08 days

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

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?

Click Here for Radioactive Dating Game Half-Life Click Here for Radioactive Dating Game