The figure above show the photon interaction cross sections for lead in the energy range where the Compton, photoelectric, and pair production processes all play a role. What is the correct identification of these cross sections?
A. 1 = Photoelectric, 2 = Compton, 3 = Pair production
B. 1 = Photoelectric, 2 = Pair production, 3 = Compton
C. 1 = Compton, 2 = Pair production, 3 = Photoelectric
D. 1 = Compton, 2 = Photoelectric, 3 = Pair production
E. 1 = Compton, 2 = Photoelectric, 3 = Compton
(GR8677 #85)
Solution:
Photoelectric Effect:
- Low-energy photon (visible/UV/soft X-rays) interacts with matter
- Results: emission of electron
Compton Scattering:
- High-energy photon (X-ray/Gamma ray) interacts with electron
- Results: emission of inelastic electron and lower energy photon
→ Energy Range: Photoelectric Effect
- High-energy photon (X-ray/gamma ray) interacs with nucleus
- Results: elementary particle and its antiparticle
→ Energy Range: Compton Scattering (electron target)
→ Energy Range: Photoelectric
→ 1 = photoelectric, 2 = pair production, 3 = Compton
Answer: B
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