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Please sit together in pairs: Mike A. and Yiran Barney and Steve T. Thomas and Joey B.

Arielle and Evan Mikhail and Rebecca Valerie and Katherine Kevin and Joe Sebek Ally and Quanbiao Matt M. and Charlie Morgan and Lu Laura and Ashkan Lauren and Naichen Mikey O. and Dale Hannah and Disha Jim and Efrain Nick and Da Ben and Heran Nik and Joe Serruto. Please sit together

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Please sit together in pairs: Mike A. and Yiran Barney and Steve T. Thomas and Joey B.

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  1. Arielle and Evan • Mikhail and Rebecca • Valerie and Katherine • Kevin and Joe Sebek • Ally and Quanbiao • Matt M. and Charlie • Morgan and Lu • Laura and Ashkan • Lauren and Naichen • Mikey O. and Dale • Hannah and Disha • Jim and Efrain • Nick and Da • Ben and Heran • Nik and Joe Serruto • Please sit together in pairs: • Mike A. and Yiran • Barney and Steve T. • Thomas and Joey B. • Glenn and Johnny • Ann and Stephen H. • Meaghan and Qihan • Korey and Nicole • Will and Ed • Michael W. and Zhenmin • Zach and Taehoon • Casey and Shenheng • Audrey and Matt R. • Lisette and Andrea • Erica and Grant Phys 150 Lecture 7

  2. Announcements • Homework 4 due on Monday at midnight. • Quiz on Chapter 5 on Tuesday in class. • Exam 1 in class on Thursday, October 4. Covers Chapters 1-5 Phys 150 Lecture 7

  3. i>clicker question The amount of natural background radiation you are exposed to each year is about • 3 nanoSv • 3 microSv • 3 milliSv • 3 Sv Phys 150 Lecture 7

  4. i>clicker question The amount of natural background radiation you are exposed to each year is about • 3 nanoSv • 3 microSv • 3 milliSv = 3 mSv = 0.003 Sv • 3 Sv - Sv = 100 rem Phys 150 Lecture 7

  5. i>clicker question If you receive a radiation dose of 1 Sv, you are most likely to • feel no effect • become very ill • die • contract cancer Phys 150 Lecture 7

  6. i>clicker question If you receive a radiation dose of 1 Sv, you are most likely to • feel no effect • become very ill • die • contract cancer • 0.003 Sv/yr – background radiation • 1 Sv – radiation sickness • 3 Sv – LD50 • 25 Sv – lifetime cancer dose Phys 150 Lecture 7

  7. i>clicker question Which of these radioactive elements contributes the most to background radiation? • Radon (222Rn) • Potassium (40K) • Carbon (14C) • Uranium (238U) Phys 150 Lecture 7

  8. i>clicker question Which of these radioactive elements contributes the most to background radiation? • Radon (222Rn) • Potassium (40K) • Carbon (14C) • Uranium (238U) Phys 150 Lecture 7

  9. i>clicker question Which of these radioactive elements contributes the most to background radiation? • Radon (222Rn) • Potassium (40K) • Carbon (14C) • Uranium (238U) • EPA limit of 4 pCi/liter • pCi = picoCurie = 10-12 Curie • Curie = 3.7 x 1010 decays/sec Phys 150 Lecture 7

  10. i>clicker question I had a chest Xray which exposed me to a total of about 0.25 mSv. What is the probability that I will develop cancer from this exposure? • 0 • 10-11 • 10-8 • 10-5 Phys 150 Lecture 7

  11. i>clicker question I had a chest Xray which exposed me to a total of about 0.25 mSv. What is the probability that I will develop cancer from this exposure? • 0 • 10-11 • 10-8 • 10-5 • Cancer dose = 25 Sv • 0.25 mSv/25 Sv = 10-3 x 10-2 = 10-5 • Assuming linear hypothesis Phys 150 Lecture 7

  12. i>clicker question If you receive a radiation dose of 10 Sv, you • have a 40% chance of contracting cancer • have a 50% chance of dying • will get very sick but survive • are toast Phys 150 Lecture 7

  13. i>clicker question If you receive a radiation dose of 10 Sv, you • have a 40% chance of contracting cancer • have a 50% chance of dying • will get very sick but survive • are toast • 1 Sv - radiation sickness • 3 Sv - LD50 • 25 Sv – lifetime radiation dose Phys 150 Lecture 7

  14. i>clicker question Which of the following would most effect your annual radiation dose? • 10 dental Xrays • Flying round trip Chicago-New York monthly • Smoking a pack of cigarettes a day • Living near a nuclear power plant Phys 150 Lecture 7

  15. i>clicker question Which of the following would most effect your annual radiation dose? • 10 dental Xrays • Flying round trip Chicago-New York monthly • Smoking a pack of cigarettes a day • Living near a nuclear power plant Smoking Estimate your annual dose EPA Estimate your annual dose LANL Phys 150 Lecture 7

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