Chapter 10: X-Ray Interaction with Matter Bushong: Radiologic Science for
Technologists
MULTIPLE CHOICE
1. The two primary forms of x-ray interaction in the diagnostic range are
.
a. Compton scattering and photoelectric absorption
b. Compton scattering and pair production
c. photoelectric absorption and coherent scattering
d. coherent scattering and Thompson scattering
ANS: A
The two primary forms of x-ray interaction in the diagnostic range are Compton
scattering and photoelectric absorption.
2. An incident x-ray interacts with an atom without ionization during .
a. photoelectric absorption
b. Compton scattering
c. coherent scattering
d. pair production
ANS: C
An incident x-ray interacts with an atom without ionization during coherent scattering.
3. An outer-shell electron is ejected and the atom is ionized during . a.
photoelectric interactions
b. Compton interactions
, c. coherent scattering
d. pair production
ANS: B
An outer-shell electron is ejected and the atom is ionized during Compton interactions.
4. Which x-ray interaction involves the ejection of the K-shell electron?
a. Coherent scattering
b. Compton interaction
c. Pair production
d. Photoelectric absorption
ANS: D
Photoelectric absorption involves the ejection of the K-shell electron.
5. The scattered x-ray from a Compton interaction usually retains of the energy of
the incident photon. a. none
b. little
c. most
d. all
ANS: C
The scattered x-ray from a Compton interaction usually retains most of the energy
of the incident photon.
6. Compton scatter is directed at angle from the incident beam.
a. a 180°
b. a 90°
c. a 0°
d. any
, ANS: D
Compton scatter is directed at any angle from the incident beam.
7. As kVp , the probability of photoelectric absorption
.
a. increases; remains the same
b. increases; decreases
c. decreases; decreases
d. decreases; remains the same
ANS: B
As kVp increases, the probability of photoelectric absorption decreases.
8. In , there is complete absorption of the incident x-ray photon. a.
photoelectric interaction
b. Compton interaction
c. pair production
d. coherent scatter
ANS: A
There is complete absorption of the incident x-ray photon in photoelectric interaction.
9. occurs only at the very high energies used in radiation therapy and in nuclear medicine
P.E.T. imaging.
Technologists
MULTIPLE CHOICE
1. The two primary forms of x-ray interaction in the diagnostic range are
.
a. Compton scattering and photoelectric absorption
b. Compton scattering and pair production
c. photoelectric absorption and coherent scattering
d. coherent scattering and Thompson scattering
ANS: A
The two primary forms of x-ray interaction in the diagnostic range are Compton
scattering and photoelectric absorption.
2. An incident x-ray interacts with an atom without ionization during .
a. photoelectric absorption
b. Compton scattering
c. coherent scattering
d. pair production
ANS: C
An incident x-ray interacts with an atom without ionization during coherent scattering.
3. An outer-shell electron is ejected and the atom is ionized during . a.
photoelectric interactions
b. Compton interactions
, c. coherent scattering
d. pair production
ANS: B
An outer-shell electron is ejected and the atom is ionized during Compton interactions.
4. Which x-ray interaction involves the ejection of the K-shell electron?
a. Coherent scattering
b. Compton interaction
c. Pair production
d. Photoelectric absorption
ANS: D
Photoelectric absorption involves the ejection of the K-shell electron.
5. The scattered x-ray from a Compton interaction usually retains of the energy of
the incident photon. a. none
b. little
c. most
d. all
ANS: C
The scattered x-ray from a Compton interaction usually retains most of the energy
of the incident photon.
6. Compton scatter is directed at angle from the incident beam.
a. a 180°
b. a 90°
c. a 0°
d. any
, ANS: D
Compton scatter is directed at any angle from the incident beam.
7. As kVp , the probability of photoelectric absorption
.
a. increases; remains the same
b. increases; decreases
c. decreases; decreases
d. decreases; remains the same
ANS: B
As kVp increases, the probability of photoelectric absorption decreases.
8. In , there is complete absorption of the incident x-ray photon. a.
photoelectric interaction
b. Compton interaction
c. pair production
d. coherent scatter
ANS: A
There is complete absorption of the incident x-ray photon in photoelectric interaction.
9. occurs only at the very high energies used in radiation therapy and in nuclear medicine
P.E.T. imaging.
