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TOPIC: Benefits & Dangers of: Radioisotopes Do Now: Draw Bohrs Model for the Cl-35 isotope

TOPIC: Benefits & Dangers of: Radioisotopes Do Now: Draw Bohrs Model for the Cl-35 isotope. RADIOISOTOPE - isotopes who ’ s nucleus is unstable and dissipate excess energy by spontaneously emitting radioactive particles (we will learn about these next week). Carbon-14. Carbon Dating.

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TOPIC: Benefits & Dangers of: Radioisotopes Do Now: Draw Bohrs Model for the Cl-35 isotope

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  1. TOPIC: Benefits & Dangers of: RadioisotopesDo Now: Draw Bohrs Model for the Cl-35 isotope

  2. RADIOISOTOPE- isotopes who’s nucleus is unstable and dissipate excess energy by spontaneously emitting radioactive particles (we will learn about these next week)

  3. Carbon-14 Carbon Dating Not that kind of dating?!

  4. C-14 used to date organic (previously living) materials

  5. U-238 decay series U-238 decays to Pb-206 (many steps) Over time, amount of U  and amount of Pb  Scientists use the ratio of U-238 to Pb-206 to date rocks

  6. Radioactive Tracers Determine the way in which a chemical reaction occur P-31: determines P uptake in plants C-14: maps C in metabolic processes C-14: maps organic molecules and figures out reaction mechanisms Used to track the distribution of a substance in cells/tissues in the body

  7. Medical radioisotopes with short half-lives (quickly eliminated from the body) Tracers in medical diagnosis Treatment of cancer I-131: Diagnosis & treat thyroid disorders Co-60: gamma emitter Used to kill cancerous tumors Tc-99: treatment of brain cancer

  8. Industrial Applications Kill bacteria and spores in food and mail Co-60: kills bacteria in foods l

  9. Power Plants Used as a fuel source to generate electricity No contributions to greenhouse gases

  10. Radiation Risks Can damage normal tissue High doses can cause illness & death Can cause mutations in DNA Disposal of waste is difficult (esp. from nuclear power plants) Have long half-lives and remain radioactive for long periods of time

  11. Chernobyl

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