Radiography Exam Radiation Physics & Principles

Question 1

Which type of radiation interaction with matter results in the complete absorption of an x-ray photon by an inner-shell electron, ejecting it from the atom?

Accepted Answer

Photoelectric effect

Answer

The photoelectric effect occurs when an x-ray photon is completely absorbed by an inner-shell electron, which is then ejected from the atom.

Question 2

What is the unit of absorbed radiation dose in the SI system?

Accepted Answer

Gray

Answer

The Gray (Gy) is the SI unit of absorbed dose, equal to 1 joule of energy deposited per kilogram of tissue.

Question 3

Which property of x-rays allows them to penetrate matter?

Accepted Answer

Short wavelength and high frequency

Answer

X-rays have short wavelengths and high frequencies, giving them enough energy to penetrate matter.

Question 4

The quality of an x-ray beam is primarily controlled by which exposure factor?

Accepted Answer

kVp

Answer

kVp (kilovoltage peak) controls the energy (quality/penetrating power) of the x-ray beam.

Question 5

Which phenomenon describes the decrease in x-ray intensity as the beam travels farther from the source?

Accepted Answer

Inverse square law

Answer

The inverse square law states that x-ray intensity is inversely proportional to the square of the distance from the source.

Radiography Exam Practice Test

Radiography Exam Practice Test

Radiography Exam Radiation Physics & Principles