College Physics
College Physics
2nd Edition
ISBN: 9780134601823
Author: ETKINA, Eugenia, Planinšič, G. (gorazd), Van Heuvelen, Alan
Publisher: Pearson,
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Chapter 30, Problem 3P
To determine

The working of positron emission tomography (PET).

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K. Virtual General Chemistry Laboratory M N. Nuclear Chemistry Name Experiment 4 - Radiation Intensity vs Distance Date Gamma radiation (gallium-67) Intensity vs Distance Distance (cm) Activity (counts/s) 1100 1000 1000 21 250 900 105 800 4. 62 700 5. 39 600 27 500 20 400 300 8. 16 200 9. 13 100 10 10 4 8 10 Distance (cm) Analysis 1. What is the relationship between radiation intensity and distance? Derive a mathematical expression for the relationship. 2. When a sample of phosphorus-32 (a beta-emitter used to treat leukemia and pancreatic cancer) was placed 1 cm from the detector, the intensity of its radiation was measure counts per second. What would its activity be 2 cm from the detector? 5 cm? 3. X rays are a type of ionizing radiation similar to gamma rays. Why does the X ray technician leave the room when you receive an X ray? 6 ト Activity (counts/s)
Match 1, 2, 3, 4 with A, B, C, D correctly. Fill in Letters Medical Imaging Technical Description A: No CT reconstruction is used. 2: Planar scintigraphy B: No collimator is used. 1: X-гаy СТ 3: SPECT C: An external photon source is used. 4: PET D: It is an emission CT but cannot work with positron emitters.
11. One type of treatment for cancer is radiotherapy. Cancer cells die if they absorb a high enough radiation dose. The diagram shows how much relative radiation dose is absorbed when photon radiation and proton radiation respectively reach different depths in tissue. Relative absorbed dose (%) 100 80 60 40 20 photon radiation proton radiation 15 5 10 depth in tissue (cm) type of radiation best suited for treating a tumor that is 15 cm deep? Motivate your answer. Which

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