Question 1

What does the acronym ALARA stand for in dental radiography?

Accepted Answer

As Low As Reasonably Achievable. It is the guiding principle that radiation exposure should be kept as low as possible while still obtaining diagnostically useful images.

Question 2

Which film speed is recommended to reduce patient radiation exposure when using traditional film-based radiography?

Accepted Answer

F-speed (the fastest available film speed) is recommended because it requires the least amount of radiation to produce a diagnostic image.

Question 3

What type of X-ray beam collimator reduces patient exposure the most compared to a round cone?

Accepted Answer

A rectangular collimator reduces patient exposure the most because it restricts the beam to closely match the size of the film or sensor, significantly reducing the area of tissue irradiated.

Question 4

What is the purpose of filtration in a dental X-ray unit?

Accepted Answer

Filtration removes low-energy (long-wavelength) X-rays from the beam that would only increase patient dose without contributing to the diagnostic image.

Question 5

What is the minimum total filtration required for dental X-ray machines operating above 70 kVp?

Accepted Answer

A minimum of 2.5 mm aluminum equivalent total filtration is required for units operating above 70 kVp.

Radiation Safety – DANB Dental Assistant Certification

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