LRA 211 EXAM PREP GUIDE 2026
QUESTIONS AND ANSWERS GRADED A
PLUS
◉ The energy of the characteristic x-ray photon depends on
Answer: the binding energy of the inner-shell electron
the energy level of the filament electron
the shell of the electron that is dropping into the vacancy.
◉ A filament electron removes a K shell electron and an M shell
electron fills the vacancy. The K shell binding energy is 69.5 keV and
the M shell binding energy is 2.8 keV. What is the energy of the K-
characteristic photon produced?
Answer: 66.7 keV
◉ Bremsstrahlung means
Answer: braking radiation.
◉ The energy of the brems photon depends on
Answer: the original energy of the filament electron
the strength of the attraction between the electron and the nucleus
the energy of the filament electron as it leaves the tungsten atom.
, ◉ The majority of the x-ray photons produced are
Answer: brems photons.
◉ Which of the following is the primary factor controlling quantity?
Answer: mAs
◉ As the distance increases, the beam quantity reaching a specific
area
Answer: decreases.
◉ Classical interactions are also known as
Answer: Thomson and coherent scattering.
◉ Coherent scattering involves
Answer: an x-ray photon with low energy.
◉ With Compton scattering, the incident photon
Answer: loses up to one third of its energy.
◉ Secondary photons produced during a Compton interaction
Answer: contribute to patient dose.
QUESTIONS AND ANSWERS GRADED A
PLUS
◉ The energy of the characteristic x-ray photon depends on
Answer: the binding energy of the inner-shell electron
the energy level of the filament electron
the shell of the electron that is dropping into the vacancy.
◉ A filament electron removes a K shell electron and an M shell
electron fills the vacancy. The K shell binding energy is 69.5 keV and
the M shell binding energy is 2.8 keV. What is the energy of the K-
characteristic photon produced?
Answer: 66.7 keV
◉ Bremsstrahlung means
Answer: braking radiation.
◉ The energy of the brems photon depends on
Answer: the original energy of the filament electron
the strength of the attraction between the electron and the nucleus
the energy of the filament electron as it leaves the tungsten atom.
, ◉ The majority of the x-ray photons produced are
Answer: brems photons.
◉ Which of the following is the primary factor controlling quantity?
Answer: mAs
◉ As the distance increases, the beam quantity reaching a specific
area
Answer: decreases.
◉ Classical interactions are also known as
Answer: Thomson and coherent scattering.
◉ Coherent scattering involves
Answer: an x-ray photon with low energy.
◉ With Compton scattering, the incident photon
Answer: loses up to one third of its energy.
◉ Secondary photons produced during a Compton interaction
Answer: contribute to patient dose.
