X-Ray Certification Radiation Physics and Protection 4

Question 1

What is characteristic radiation?

Accepted Answer

Radiation emitted when an outer-shell electron fills an inner-shell vacancy

Answer

Characteristic radiation is produced when an outer-shell electron drops to fill a vacancy left by an ejected inner-shell electron, releasing energy as a photon.

Question 2

Which of the following is the most radiosensitive tissue?

Accepted Answer

Bone marrow

Answer

Bone marrow contains rapidly dividing hematopoietic cells, making it highly radiosensitive according to the law of Bergonié and Tribondeau.

Question 3

What is the purpose of filtration in an X-ray tube?

Accepted Answer

To remove low-energy photons that increase patient dose without contributing to the image

Answer

Added filtration hardens the beam by removing low-energy photons that would be absorbed by the patient and add dose without improving the image.

Question 4

During pair production, a high-energy photon is converted into which particles?

Accepted Answer

An electron and a positron

Answer

Pair production occurs when a photon with energy above 1.02 MeV interacts near a nucleus and converts into an electron-positron pair.

Question 5

A pregnant radiologic technologist's gestational dose limit per month is:

Accepted Answer

0.5 mSv

Answer

The NCRP recommends limiting fetal exposure to 0.5 mSv (0.05 rem) per month once a pregnancy is declared.

X-Ray Certification Practice Test

X-Ray Certification Practice Test

X-Ray Certification Radiation Physics and Protection 4