DRC Radiation Protection & Compliance 3

Question 1

Which type of collimator reduces patient exposure the most compared to a round PID?

Accepted Answer

Rectangular collimator

Answer

Rectangular collimation reduces the exposed field to just slightly larger than the image receptor, cutting patient exposure by up to 60% compared to round collimation.

Question 2

State radiation protection regulations for dental offices are primarily enforced by:

Accepted Answer

State radiation control programs

Answer

State radiation control programs, under agreement with the NRC or independently, enforce radiation safety regulations for dental X-ray equipment.

Question 3

What is the half-value layer (HVL) in dental radiography?

Accepted Answer

The thickness of material that reduces beam intensity by 50%

Answer

The HVL is the thickness of a specified material that reduces the X-ray beam intensity to half its original value, indicating beam quality.

Question 4

When is it acceptable to hold a film or sensor for a patient during dental radiography?

Accepted Answer

It is never acceptable for the operator to hold the receptor

Answer

Operators should never hold films or sensors because even low occupational doses are cumulative; film-holding devices must always be used instead.

Question 5

Inherent filtration in a dental X-ray tube is primarily provided by the:

Accepted Answer

Glass envelope and insulating oil

Answer

Inherent filtration arises from the glass envelope of the X-ray tube and the insulating oil, removing the lowest-energy photons from the beam.

(DRC) Dental Radiology Certification for Dental Hygienist Practice Test

(DRC) Dental Radiology Certification for Dental Hygienist Practice Test

DRC Radiation Protection & Compliance 3