10/5 What are the three types of radioactive decay?

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10/5 What are the three types of radioactive decay?

  1. 1. Launch:10/5   Grab a your binder and immediately take a seat   Read “Effects of Radiation” handout   Make a list of at least 5 different effects radiation has on the human body
  2. 2. Unit #3: Nuclear Processes
  3. 3. What are the 3 types of radioactive decay? Mr. Heffner 10/5/09
  4. 4. What is radioactive decay?   Radioactive decay is…   when unstable isotopes transform into more stable isotopes by emitting particles from the nucleus. atoms with an neutron inbalance shooting out
  5. 5. What is radioactive decay?   There are three types of decay (a.k.a. radiation) 1.  Alpha ( ) decay 2.  Beta ( ) decay 3.  Gamma ( ) decay
  6. 6. What is an alpha ( ) particle? 4   Symbol: 2 He   Description:   Basically, a Helium nucleus   2 protons, 2 neutrons   Atomic mass = 4 amu   Penetration:   Low, can’t even get through a sheet of paper
  7. 7. What is a beta ( ) particle? 0   Symbol: -1 e   Description:   Basically, an electron   Neutron converts to a proton   Penetration:   Medium, can’t get through a sheet of metal
  8. 8. What is a gamma ( ) particle?   Symbol: 0 0   Description:   Basically, a high energy ray   a.k.a. X-rays   Penetration:   High, only stopped by thick wall of lead   Very dangerous: can penetrate skin  DNA mutation   Three-eyed fish
  9. 9. Foldable   Make your foldable (9 min)   Radioactive decay   particle (symbol, penetration)   particle (symbol,penetration)   particle (symbol, penetration)   Half-life   Unstable isotopes   Strong force   Electrostatic repulsion
  10. 10. Foldable   Review foldable by yourself (4 min)   MEMORIZE THE SYMBOLS AND DEFINITIONS!   Quiz your partner (4 min)
  11. 11. Practice Questions 1.  What happens during radioactive decay? 2.  Why does radioactive decay occur? 3.  What are the 3 types of decay? 4.  Draw the symbol for a(n) 1.  particle 2.  particle 3.  particle 5.  Which of the particles can penetrate a piece of paper? A thin sheet of metal?
  12. 12. Exit Slip 1.  When an unstable atom undergoes nuclear decay a.  it continues to absorb energy until stability is reached b.  it always changes the identity of the atom c.  it becomes a highly reactive isotope that forms chemical bonds with other atoms d.  it emits , , and particles to become more stable 2.  Which of the following is the correct symbol for a particle? a.  42He b.  01e c.  0-1e d.  24He
  13. 13. Exit Slip 3.  An -particle consists of a.  2 protons, 2 neutrons, and has an atomic mass of 4 amu b.  a hydrogen-4 nucleus c.  4 electrons and 2 protons d.  only electrons 4.  Gamma ( ) rays are a.  high-energy particles that can penetrate skin and and mutate DNA b.  less energetic than or particles c.  responsible for changing an atom into a different element d.  not emitted during radioactive decay
  14. 14. Exit Slip 5.  A 2-cm thick piece of cardboard placed over a radiation source would be most effective in protecting against which type of radiation? a.  alpha b.  beta c.  gamma d.  X-ray
  15. 15. Homework   Pg. 657 #1   Pg. 669 #6, 10

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