1. Phys 150 Lecture 71 Please sit together in pairs: –Onyema and Dian –Alejandra and Michael –Chris and Honglu –Ryan and Matt –John F. and Lin –Walter and Anwen –Max and Mengyue –Amanda and Melissa –Pauline and Zhongyun –John W. and Erich –Jennifer and Irfan –Alexandra and Jason –David and Jiayuna –Abigael and Erica –Jake and

2. Phys 150 Lecture 72 Announcements Homework 5 is due on Sunday at midnight. Quiz on Chapter 5 on Tuesday.

3. 10-Feb-2011 Phys 150 Lecture 83 i>clicker question The amount of natural background radiation you are exposed to each year is about A.3 nanoSv B.3 microSv C.3 milliSv D.3 Sv

4. 10-Feb-2011 Phys 150 Lecture 84 i>clicker question The amount of natural background radiation you are exposed to each year is about A.3 nanoSv B.3 microSv C.3 milliSv = 3 mSv = 0.003 Sv D.3 Sv - Sv = 100 rem

5. 10-Feb-2011 Phys 150 Lecture 85 i>clicker question If you receive a radiation dose of 1 Sv, you are most likely to A.feel no effect B.become very ill C.die D.contract cancer

6. 10-Feb-2011 Phys 150 Lecture 86 i>clicker question If you receive a radiation dose of 1 Sv, you are most likely to A.feel no effect B.become very ill C.die D.contract cancer -0.003 Sv/yr – background radiation -1 Sv – radiation sickness -3 Sv – LD50 -25 Sv – lifetime cancer dose

7. 10-Feb-2011 Phys 150 Lecture 87 i>clicker question Which of these radioactive elements contributes the most to background radiation? A.Radon ( 222 Rn) B.Potassium ( 40 K) C.Carbon ( 14 C) D.Uranium ( 238 U)

8. 10-Feb-2011 Phys 150 Lecture 88 i>clicker question Which of these radioactive elements contributes the most to background radiation? A.Radon ( 222 Rn) B.Potassium ( 40 K) C.Carbon ( 14 C) D.Uranium ( 238 U)

9. 10-Feb-2011 Phys 150 Lecture 89 i>clicker question Which of these radioactive elements contributes the most to background radiation? A.Radon ( 222 Rn) B.Potassium ( 40 K) C.Carbon ( 14 C) D.Uranium ( 238 U) -EPA limit of 4 pCi/liter -pCi = picoCurie = 10 -12 Curie -Curie = 3.7 x 10 10 decays/sec

10. 10-Feb-2011 Phys 150 Lecture 810 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? A.0 B.10 -11 C.10 -8 D.10 -5

11. 10-Feb-2011 Phys 150 Lecture 811 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? A.0 B.10 -11 C.10 -8 D.10 -5 -Cancer dose = 25 Sv -0.25 mSv/25 Sv = 10 -3 x 10 -2 = 10 -5 -Assuming linear hypothesis

12. 10-Feb-2011 Phys 150 Lecture 812 i>clicker question If you receive a radiation dose of 10 Sv, you A.have a 40% chance of contracting cancer B.have a 50% chance of dying C.will get very sick but survive D.are toast

13. 10-Feb-2011 Phys 150 Lecture 813 i>clicker question If you receive a radiation dose of 10 Sv, you A.have a 40% chance of contracting cancer B.have a 50% chance of dying C.will get very sick but survive D.are toast -1 Sv - radiation sickness -3 Sv - LD50 -25 Sv – lifetime radiation dose

14. 10-Feb-2011 Phys 150 Lecture 814 i>clicker question Which of the following would most effect your annual radiation dose? A.10 dental Xrays B.Flying round trip Chicago-New York monthly C.Smoking a pack of cigarettes a day D.Living near a nuclear power plant

15. 10-Feb-2011 Phys 150 Lecture 815 i>clicker question Which of the following would most effect your annual radiation dose? A.10 dental Xrays B.Flying round trip Chicago-New York monthly C.Smoking a pack of cigarettes a day D.Living near a nuclear power plant Estimate your annual dose EPA Estimate your annual dose LANL Smoking