1. ICP Half-Life Centsium Lab 10/1/12

2. Warmup 1)Which is more stable? A sample with a half- life of one day, or a sample with a half-life of one week? 2)Write an equation for the beta decay of thorium-234. 3)How many half-lives must a radioactive sample go through before it is at 25% of its original amount?

3. Agenda Centsium Lab Time to work on half-life problems worksheet Homework: “Half-Life Problems” Worksheet from Friday

4. Centsium Lab Pointers Total TimeUndec. 1Undec. 2Undec. 3Decay 1Decay 2Decay 3 050 000 10 20 Keep adding your decayed to the number of decayed before. Do not lose pennies. A missing penny is one point off your group’s lab grade. Lay out your pennies in two 5x5 squares before putting them up at the end, so that I can check that you have them all.