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

Radiation produced by nuclear fission

Answer

Scatter radiation exiting the patient

Answer

Radiation that passes through the patient unchanged

Question 2

Which of the following is the most radiosensitive tissue?

Accepted Answer

Bone marrow

Answer

Muscle tissue

Answer

Nerve tissue

Answer

Cartilage

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

To increase image contrast

Answer

To reduce the number of high-energy photons reaching the patient

Answer

To collimate the beam to the area of interest

Question 4

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

Accepted Answer

An electron and a positron

Answer

A proton and a neutron

Answer

Two gamma rays

Answer

A proton and an electron

Question 5

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

Accepted Answer

0.5 mSv

Answer

1.0 mSv

Answer

5.0 mSv

Answer

50 mSv

Question 6

What does the linear no-threshold (LNT) model assume about radiation risk?

Accepted Answer

Risk increases linearly with dose with no safe threshold

Answer

There is a safe dose of radiation below which no harm occurs

Answer

Risk is zero below 100 mSv

Answer

High doses are safer than low doses

Question 7

Which interaction predominates when diagnostic X-ray photons interact with bone?

Accepted Answer

Photoelectric effect

Answer

Compton scattering

Answer

Pair production

Answer

Coherent scattering