Consider a 1 kg mass of material exposed to the photons described below. Write down the energy contribution (in keV or MeV) to both dose and kerma for each interaction. You may ignore the binding energy of the electron for any photoelectric events. For kerma, consider collision kerma only. a) Incident photon: E1 = 60 keV, undergoes a photoelectric effect, the photoelectron does not escape. b)Incident photon E2 = 90 keV, undergoes a photoelectric effect, and a Bremsstrahlung photon of 20 keV escapes. c) Incident photon E3 = 5 MeV, creates Compton photon of 2.6 MeV which escapes; the Compton electron is contained in the material. d)Incident photon E4 = 6 MeV, creates a Compton photon of 2.1 MeV which escapes. The Compton electron escapes the material with an energy of 1.2 MeV. e) Incident photon Es = 3 MeV creates a Compton photon of 600 keV, which immediately undergoes a photoelectric effect. The photoelectron does not escape the material. The Compton electron escapes the material with an energy of 200 keV.
Consider a 1 kg mass of material exposed to the photons described below. Write down the energy contribution (in keV or MeV) to both dose and kerma for each interaction. You may ignore the binding energy of the electron for any photoelectric events. For kerma, consider collision kerma only. a) Incident photon: E1 = 60 keV, undergoes a photoelectric effect, the photoelectron does not escape. b)Incident photon E2 = 90 keV, undergoes a photoelectric effect, and a Bremsstrahlung photon of 20 keV escapes. c) Incident photon E3 = 5 MeV, creates Compton photon of 2.6 MeV which escapes; the Compton electron is contained in the material. d)Incident photon E4 = 6 MeV, creates a Compton photon of 2.1 MeV which escapes. The Compton electron escapes the material with an energy of 1.2 MeV. e) Incident photon Es = 3 MeV creates a Compton photon of 600 keV, which immediately undergoes a photoelectric effect. The photoelectron does not escape the material. The Compton electron escapes the material with an energy of 200 keV.
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Transcribed Image Text:Consider a 1 kg mass of material exposed to the photons described below. Write down the energy
contribution (in kev or MeV) to both dose and kerma for each interaction. You may ignore the binding
energy of the electron for any photoelectric events. For kerma, consider collision kerma only.
a) Incident photon: E1 = 60 keV, undergoes a photoelectric effect, the photoelectron does not
escape.
b)Incident photon E2 = 90 keV, undergoes a photoelectric effect, and a Bremsstrahlung photon of
20 keV escapes.
c) Incident photon E3 = 5 MeV, creates Compton photon of 2.6 MeV which escapes; the Compton
electron is contained in the material.
d)Incident photon E4 = 6 MeV, creates a Compton photon of 2.1 MeV which escapes. The
Compton electron escapes the material with an energy of 1.2 MeV.
e) Incident photon Es = 3 MeV creates a Compton photon of 600 keV, which immediately
undergoes a photoelectric effect. The photoelectron does not escape the material. The
Compton electron escapes the material with an energy of 200 keV.
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