Radiography Exam Radiation Physics & Principles 2

Question 1

What is the primary purpose of added filtration in an x-ray tube assembly?

Accepted Answer

Remove low-energy photons that contribute only to patient dose

Answer

Added filtration removes low-energy (soft) x-rays that would be absorbed by the patient without contributing to image formation.

Question 2

Half-value layer (HVL) is used to describe which characteristic of an x-ray beam?

Accepted Answer

Beam quality (penetrating ability)

Answer

HVL is the thickness of a specified material that reduces beam intensity by half, describing the beam's penetrating quality.

Question 3

Compton scatter is most likely to occur when x-ray photons interact with which type of electrons?

Accepted Answer

Outer-shell (valence) electrons

Answer

Compton scatter involves interaction between x-ray photons and loosely bound outer-shell electrons, producing a scattered photon and a recoil electron.

Question 4

Which factor has the greatest influence on the quantity (number of photons) of x-rays produced?

Accepted Answer

mAs

Answer

mAs (milliampere-seconds) directly controls the number of x-ray photons produced and thus beam quantity.

Question 5

What is the primary composition of the x-ray beam produced at the anode?

Accepted Answer

Mostly bremsstrahlung radiation

Answer

Bremsstrahlung (braking) radiation makes up approximately 80–90% of the useful x-ray beam at diagnostic energies.

Radiography Exam Practice Test

Radiography Exam Practice Test

Radiography Exam Radiation Physics & Principles 2