Radioactivity and Half-Life

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Radioactivity and Half-Life

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Presentation transcript:

Radioactivity and Half-Life Integrated Science 1

9/24/13 What are some effects of radiation?

Radioactivity An unstable atomic nucleus emits a form of radiation (alpha, beta, or gamma) to become stable. In other words, the nucleus decays into a different atom.

Radioactivity Alpha Particle – Helium nucleus Beta Particle – electron Gamma Ray – high-energy photon

Half-Life Amount of time it takes for one half of a sample of radioactive atoms to decay

Medical Applications of Half-Life Nuclide Half-Life Area of Body I–131 8.1 days Thyroid Fe–59 45.1 days Red Blood Cells Sr–87 2.8 hours Bones Tc–99 6.0 hours Heart Na–24 14.8 hours Circulatory System

Half-Life Calculation #1 You have 400 mg of a radioisotope with a half-life of 5 minutes. How much will be left after 30 minutes?

Half-Life Calculation #2 Suppose you have a 100 mg sample of Au-191, which has a half-life of 3.4 hours. How much will remain after 10.2 hours?

Half-Life Calculation # 3 Cobalt-60 is a radioactive isotope used in cancer treatment. Co-60 has a half-life of 5 years. If a hospital starts with a 1000 mg supply, how many mg will need to be purchased after 10 years to replenish the original supply?

Half-Life Calculation # 4 A radioisotope has a half-life of 1 hour. If you began with a 100 g sample of the element at noon, how much remains at 3 PM? At 6 PM? At 10 PM?

Half-Life Calculation # 5 How many half-lives have passed if 255 g of Co-60 remain from a sample of 8160 g?

Half-Life Calculation # 6 Suppose you have a sample containing 400 nuclei of a radioisotope. If only 25 nuclei remain after one hour, what is the half-life of the isotope?

Half-Life Calculation # 7 If a radioactive element has diminished by 7/8 of its original amount in 30 seconds, what is its half-life?

Answers to Half-Life Calculations 6.25 mg Half-Life Calculation #2 12.5 mg Half-Life Calculation #3 750 mg

Answers to Half-Life Calculations 12.5 g, 1.5625 g, 0.09765625 g Half-Life Calculation #5 5 half-lives

Answers to Half-Life Calculations 15 minutes Half-Life Calculation #7 10 seconds