Are you prepared?...

1. Are you prepared?... http://www.youtube.com/watch?v=vZAJbJc1ayc start 2:27

3. Renewable or Non-Renewable?

4. What is Radiation? Uranium 92U238.02891 How many protons? How many electrons? How many neutrons? 6 C Carbon 12.011 92 protons 92 electrons 146 neutrons

5. Ionizing vs. non-ionizing radiation

6. What is Radiation? • Radiation = particles or rays given off by unstable atoms. • 3 Types: • Alpha (α) • Travels few inches • Blocked by paper (skin) • Beta (β) • Travels few feet • Blocked by aluminum, glass • Gamma (γ) • Travels far • Blocked by lead (steel & concrete).

7. Don’t forget: You can copy-paste this slide into other presentations, and move or resize the poll.

8. Background Radiation • The amount of radiation we are exposed to daily from the environment • Average = 360 millirem/year or 3 millisieverts

10. www.geology.fau.edu/course_info/fall02/ EVR3019/Nuclear_Waste.ppt

11. When people think about nuclear power they think about… • Effects of radiation • What to do with nuclear waste • Nuclear disasters

13. Effects of Radiation • Genetic damages: from mutations that alter genes • defects can become apparent in the next generation • Somatic damages: to tissue, such as burns, miscarriages & cancers www.bio.miami.edu/beck/esc101/Chapter14&15.ppt

14. Three Mile Island - 1979 • .008 sieverts over 7 days • 1,000 sieverts is radiation sickness • 5,000 is death http://maps.google.com/maps?um=1&hl=en&q=three%20mile%20island%20plant%20map&ndsp=20&safe=on&ie=UTF-8&sa=N&tab=il

15. Chernobyl - 1986 • 300 sieverts per hour • 240 acute radiation sickness; 31 died within 3 months • 100,000 people evacuated • Some claim up to 985,000 deaths due to Chernobyl

16. Chernobyl Fallout

17. Japan • 0.4 sieverts per hour • 70,000 people evacuated • 140,000 told to stay inside

18. Nuclear Energy • The energy that exists within the nucleus of an atom. • Nuclear Fission = the release of energy from the splitting of atoms! • Nuclear Fusion = the combining of two smaller atoms into one larger atom. (happens in the sun) • http://videos.howstuffworks.com/discovery/29389-assignment-discovery-nuclear-basics-video.htm

19. Nuclear Fission http://www.youtube.com/watch?v=Pmy5fivI_4U http://www.youtube.com/watch?v=aldk-HWESzw

20. Nuclear Power Plant a controlled nuclear fission chain reaction heats water produce high-pressure steam that turns turbines which turns generator and creates electricity. http://www.howstuffworks.com/nuclear-power2.htm http://www.youtube.com/watch?v=Pmy5fivI_4U http://www.youtube.com/watch?v=aldk-HWESzw

21. www.bio.miami.edu/beck/esc101/Chapter14&15.ppt

22. 437 commercial reactors in 32 countries, producing 17% electricity

23. Nuclear Energy around the World

25. Limerick Power Plant, Montgomery County

26. http://www.ida.liu.se/~her/npp/demo.html

27. Where nuclear fission occurs. Surrounded by thick concrete, steel & lead. Blocks all radiation! Nuclear Reactor

28. Inside the Reactor http://online.wsj.com/article/SB10001424052748704396504576205000098975380.html#project%3DFUELASSEMBLY0317%26articleTabs%3Dinteractive

29. Fuel Rods • 35,000 – 70,000 fuel rods • 3% Uranium-235 pellets • Fission reaction heats up water

30. Control Rods • absorb extra neutrons • Control the chain reaction

31. What do all of these nuclear power plants have in common?

33. Cooling Tower • Water taken from river, lake, ocean • Used to condense the hot steam back to water, but some is still released as steam. (no CO2, just water!) • Warm water released back into the river • Not radioactive – never touches the uranium! • Thermal pollution

35. Nuclear waste • Power plants produce radioactive wastes • mostly spent fuel rods (3-4 years) • each reactor produces about 20-30 tons yearly • Currently stored in pools on site and then above ground casks • some remain dangerous for tens of thousands of years • How should we store this waste?

38. Yucca Mountain

39. Options for Waste • Keep onsight • Bury • Shoot into space • Bury in ocean floor • Bury in Antarctica • Change it into harmless or reprocess to make new fuel

40. Low-Level & High Level Radioactive Waste Emit small amounts of ionizing radiation Stored 100-500 years 19401970: put in steel drums, dumped in ocean (still UK & Pakistan) 1970+: gov’t run landfills • Stored for thousands of years • Mostly spent fuel rods (240,000 yrs) • Safety debate • Options: • Keep onsight • Bury • Shoot into space • Bury in ocean floor • Bury in Antarctica • Change it into harmless

41. Decommissioning Life span of a power plant = 15-40 years Parts wear out, Fuel is spent Plant is shut down Highly radioactive for 240,000 years Must store for 10 times the half-life What can we do with them?

42. Half-Life = time needed for one-half of the nuclei in a radioisotope to decay and emit their radiation to form a stable isotope Half-time emitted Uranium 235 710 million yrs alpha, gamma Plutonium 239 24,000 yrs alpha, gamma www.bio.miami.edu/beck/esc101/Chapter14&15.ppt

43. Three Mile Island - 1979 • .008 sieverts over 7 days • Remember 1,000 sieverts is radiation sickness • 5,000 is death http://maps.google.com/maps?um=1&hl=en&q=three%20mile%20island%20plant%20map&ndsp=20&safe=on&ie=UTF-8&sa=N&tab=il

44. Chernobyl - 1986 • 300 sieverts per hour • 240 acute radiation sickness; 31 died within 3 months • 100,000 people evacuated • Some claim up to 985,000 deaths due to Chernobyl

45. Chernobyl Fallout

46. Japan • 0.4 sieverts per hour • 70,000 people evacuated • 140,000 told to stay inside

47. http://streaming.discoveryeducation.com/search/assetDetail.cfm?guidAssetID=BE0FB49C-7C70-4C56-95F2-B3904BC9077Fhttp://streaming.discoveryeducation.com/search/assetDetail.cfm?guidAssetID=BE0FB49C-7C70-4C56-95F2-B3904BC9077F • 10 min video on nuclear energy • Fission, fusion, overview

48. What do you know now? • Take the quiz: http://science.howstuffworks.com/nuclear-radiation-quiz.htm