19 Apr 7 Fundamental Forces, Radiation Doses, Medical Applications Actual Presented
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Quantifying radioactivity and radiation dosage, medical applications of radiation, fundamental forces and particles.
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19 Apr 7 Fundamental Forces, Radiation Doses, Medical Applications Actual Presented
- 2. Today: Radiation Dose Definitions, Medical Applications, PET scan 3-D rendering Source: wikipedia
- 10. Radioactive decay is a random process P P P P P P P P P P P P P P P P P P U P P U P P P P U P U U P P P P P P S S S S S U P U U P P P P P U U P U P P U P S S S S S S S U P U U P P P U P U U P U U P U P S S S S S S S S S 10 days 20 days 30 days Example: Phosphorus-32 decay into Sulfur-32
- 19. Results of homework assignment
- 20. A few homework responses Adrian: If I became a luddite and lived in a hut in the woods at sea level I might save myself 80 mrem or so. Laura: Only 2.010 mrem or 0.6 % of my annual radiation exposure can be attributed to man made sources David: Unavoidable background radiation is from food and water, there is absolutely nothing I can do to change that.
- 26. Medical applications of radiation Destruction: Radiation Therapy Imaging: X-rays Imaging: Positron emission tomography Imaging: Gastrointestinal imaging
- 27. Positron emission tomography (PET scanning)
- 29. Some slides about cancer radiation therapy http://youtube.com/watch?v=ZtENJI1K1hA&feature=related
- 35. Protons and neutrons are made of quarks Quark model of a proton www2.cnrs.fr/presse/communique/709.htm “ Up” quarks charge = + 2/3 each “ Down” quark -1/3 charge Arpad Horvath Quark model of neutron
- 36. Quarks and Leptons are the constituent parts of matter. Murray Gell-Mann Nobel Prize 1969 There are six quarks Up Charmed Top Down Strange Bottom Charge = +2/3 Charge = -1/3 Similarly, there are six leptons Increasing mass Electron Muon Tau Electron neutrino Muon neutrino Tau neutrino Antimatter consists of the 6 anti-particle quarks and 6 anti-particle leptons
- 37. Under normal conditions, quarks do not exist in free space. Fermilab particle accelerator Billion-dollar physics experiments were required to detect quarks for fleeting instants in time
- 38. Beta-decay can transform a neutron into a proton Quarks (Electron) It is a decay of a “down quark” into an “up quark”