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QOTD. How do we measure the stability of an atom?. Half Life. Mr. Dunnum. 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

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Presentation Transcript
slide1
QOTD
  • How do we measure the stability of an atom?
half life

Half Life

Mr. Dunnum

radioactivity
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.
radioactivity1
Radioactivity
  • Alpha Particle – Helium nucleus
  • Beta Particle – electron
  • Gamma Ray – high-energy photon
half life1
Half-Life
  • Amount of time it takes for one half of a sample of radioactive atoms to decay
half life calculation 1
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 #1
  • 6.25 mg
half life calculation 2
Half-Life Calculation # 2
  • In a sample of 8160g of Co-60, how much of the sample is left after 5 half-lives have passed?
  • Half-Life Calculation #2
  • 255g