ARRT Radiation and Safety 3

Question 1

What is the recommended minimum distance a radiographer should stand from the patient during a portable radiographic exposure when a protective barrier is unavailable?

Accepted Answer

6 feet (1.8 m)

Answer

When no protective barrier is available, the technologist should stand at least 6 feet (1.8 m) from the patient and the primary beam.

Question 2

The dose equivalent limit for the lens of the eye for radiation workers is:

Accepted Answer

150 mSv/year

Answer

NCRP recommends a 150 mSv (15 rem) per year dose equivalent limit for the lens of the eye for occupational workers.

Question 3

Which interaction is primarily responsible for patient dose in diagnostic X-ray imaging?

Accepted Answer

Photoelectric effect

Answer

The photoelectric effect results in complete absorption of the X-ray photon by the tissue, contributing most significantly to patient dose in the diagnostic range.

Question 4

A radiation worker receives an extremity dose of 450 mSv in one year. This is:

Accepted Answer

Below the annual extremity limit of 500 mSv

Answer

The NCRP annual dose equivalent limit for extremities (hands and feet) is 500 mSv (50 rem), so 450 mSv is below the limit.

Question 5

During fluoroscopy, scatter radiation to personnel is greatest:

Accepted Answer

Directly beside the patient at the tabletop level

Answer

Scatter radiation is highest at the patient's tabletop level directly beside the patient, where primary beam interactions with tissue create the most scatter.

ARRT - American Registry of Radiologic Technologists Practice Test

ARRT - American Registry of Radiologic Technologists Practice Test

ARRT Radiation and Safety 3