Phys 150 Lecture 7 1

• 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

Phys 150 Lecture 7 2

Announcements• Homework 5 is due on Sunday at

midnight.• Quiz on Chapter 5 on Tuesday.

10-Feb-2011 Phys 150 Lecture 8 3

i>clicker questionThe amount of natural background radiation you are exposed to each year is about

A. 3 nanoSvB. 3 microSvC. 3 milliSvD. 3 Sv

10-Feb-2011 Phys 150 Lecture 8 4

i>clicker questionThe amount of natural background radiation you are exposed to each year is about

A. 3 nanoSvB. 3 microSvC. 3 milliSv = 3 mSv = 0.003 SvD. 3 Sv

- Sv = 100 rem

10-Feb-2011 Phys 150 Lecture 8 5

i>clicker questionIf you receive a radiation dose of 1 Sv, you are most likely to

A. feel no effectB. become very illC. die D. contract cancer

10-Feb-2011 Phys 150 Lecture 8 6

i>clicker questionIf you receive a radiation dose of 1 Sv, you are most likely to

A. feel no effectB. become very illC. die D. contract cancer

- 0.003 Sv/yr – background radiation - 1 Sv – radiation sickness- 3 Sv – LD50- 25 Sv – lifetime cancer dose

10-Feb-2011 Phys 150 Lecture 8 7

i>clicker questionWhich of these radioactive elements contributes the most to background radiation?

A. Radon (222Rn)B. Potassium (40K)C. Carbon (14C)D. Uranium (238U)

10-Feb-2011 Phys 150 Lecture 8 8

i>clicker questionWhich of these radioactive elements contributes the most to background radiation?

A. Radon (222Rn)B. Potassium (40K)C. Carbon (14C)D. Uranium (238U)

10-Feb-2011 Phys 150 Lecture 8 9

i>clicker questionWhich of these radioactive elements contributes the most to background radiation?

A. Radon (222Rn)B. Potassium (40K)C. Carbon (14C)D. Uranium (238U)

- EPA limit of 4 pCi/liter- pCi = picoCurie = 10-12 Curie- Curie = 3.7 x 1010 decays/sec

10-Feb-2011 Phys 150 Lecture 8 10

i>clicker questionI 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. 0B. 10-11

C. 10-8

D. 10-5

10-Feb-2011 Phys 150 Lecture 8 11

i>clicker questionI 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. 0B. 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

10-Feb-2011 Phys 150 Lecture 8 12

i>clicker questionIf you receive a radiation dose of 10 Sv, you

A. have a 40% chance of contracting cancerB. have a 50% chance of dyingC. will get very sick but survive D. are toast

10-Feb-2011 Phys 150 Lecture 8 13

i>clicker questionIf you receive a radiation dose of 10 Sv, you

A. have a 40% chance of contracting cancerB. have a 50% chance of dyingC. will get very sick but survive D. are toast

- 1 Sv - radiation sickness- 3 Sv - LD50- 25 Sv – lifetime radiation dose

10-Feb-2011 Phys 150 Lecture 8 14

i>clicker questionWhich of the following would most effect your annual radiation dose?

A. 10 dental XraysB. Flying round trip Chicago-New York

monthlyC. Smoking a pack of cigarettes a day D. Living near a nuclear power plant

10-Feb-2011 Phys 150 Lecture 8 15

i>clicker questionWhich of the following would most effect your annual radiation dose?

A. 10 dental XraysB. Flying round trip Chicago-New York

monthlyC. Smoking a pack of cigarettes a day D. Living near a nuclear power plant

Estimate your annual dose EPAEstimate your annual dose LANL

Smoking