2. Finish the equationsWhat kind of decay is this (alpha, beta, or gamma) or what kind of reaction is taking place (Answer after section 3)

3. 1. Spent fuel rods contain strontium-90 whose half-life is 28.1 years. What is the decay constant of strontium-90?

4. 2. Spent fuel rods contain strontium-90 whose half-life is 28.1 years. Josh works at a nuclear reactor and must safely store the spent rods. If a spent rod contains 1.00 x 10 27 atoms of strontium-90 when stored in a sealed container, how many strontium-90 atoms will remain if the container is excavated by archeologists 1000 years later?

5. 3. The half-life of technicium-99 is 6.02 hours. What is the decay constant of technicium-99?

6. 4. The synthetically manufactured radiopharmaceutical technicium-99 is used to produce a scan of Dale’s brain after he suffers a concussion. The half- life of technicium-99 is 6.02 hours. If Dale was given a dose of 1.32 x 10 6 molecules, how many molecules of technicium-99 remains in Dale’s body 24 hours after the scan?

7. 5. What fraction of technicium-99 is left after 3 half lives?

8. 6. Technicium-99 has a half life of 6.02 hours. A sample containing 3.42 x 10 12 radioactive atoms sits in a lead case for 5012.1 hours. How many Technicium-99 atoms remain after that amount of time?