DRC Radiologic Physics & Safety 2

Question 1

Which unit of radiation dose equivalent is used to express occupational exposure limits in the United States?

Accepted Answer

Sievert (Sv)

Answer

The sievert (Sv) is the SI unit for dose equivalent, accounting for biological effectiveness, and is used in occupational exposure limits.

Question 2

What is the maximum permissible dose (MPD) for a radiation worker per year according to NCRP recommendations?

Accepted Answer

50 mSv (5 rem)

Answer

The NCRP recommends a maximum permissible dose of 50 mSv (5 rem) per year for occupationally exposed individuals.

Question 3

The penumbra effect in dental radiography refers to:

Accepted Answer

A blurred unsharp border around the image

Answer

Penumbra is the zone of unsharpness at image edges caused by the finite size of the focal spot.

Question 4

Which interaction between X-rays and matter is primarily responsible for image formation on dental radiographs?

Accepted Answer

Photoelectric effect

Answer

The photoelectric effect, where photons are completely absorbed by inner-shell electrons, is the primary interaction responsible for radiographic image contrast.

Question 5

A film badge worn by dental personnel measures:

Accepted Answer

Cumulative occupational radiation exposure over time

Answer

Film badges record cumulative radiation exposure over a monitoring period, typically one to three months, for occupational dose tracking.

(DRC) Dental Radiology Certification for Dental Hygienist Practice Test

(DRC) Dental Radiology Certification for Dental Hygienist Practice Test

DRC Radiologic Physics & Safety 2