X-Ray Certification Radiation Physics and Protection 5

Question 1

What is the primary biological target of ionizing radiation that leads to cell damage?

Accepted Answer

DNA

Answer

Mitochondrial RNA

Answer

Cell membrane lipids

Answer

Cytoplasmic proteins

Question 2

What type of effect occurs when radiation damage in one cell leads to effects in neighboring unirradiated cells?

Accepted Answer

Bystander effect

Answer

Stochastic effect

Answer

Deterministic effect

Answer

Threshold effect

Question 3

Which factor does NOT affect patient dose during a radiographic examination?

Accepted Answer

Color of the collimator light

Answer

kVp setting

Answer

mAs setting

Answer

Distance from tube to patient

Question 4

In a fluoroscopy suite, which protective device provides the most effective real-time shielding for the operator?

Accepted Answer

Ceiling-suspended leaded acrylic shield

Answer

Thyroid collar

Answer

Lead gloves

Answer

Leaded acrylic drape suspended from the table

Question 5

Stochastic radiation effects are characterized by which of the following?

Accepted Answer

Probability of occurrence increases with dose

Answer

They have a threshold dose below which they do not occur

Answer

Severity increases with dose

Answer

They are always immediately apparent after exposure

Question 6

What is the primary function of a personnel monitoring device such as an OSL dosimeter?

Accepted Answer

To measure and record cumulative radiation exposure received by the wearer

Answer

To shield the technologist from radiation

Answer

To alert the wearer when dose rate exceeds safe levels

Answer

To measure patient entrance skin dose

Question 7

Which shielding material is most commonly used for structural radiation protection in X-ray rooms?

Accepted Answer

Lead

Answer

Copper

Answer

Aluminum

Answer

Steel