← Radiation Safety – DANB Dental Assistant Certification

DANB Dental Assistant Certification Practice Test

Free 5-question sample test with instant feedback. See how ready you are.

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Sample Questions

Question 1

What does the acronym ALARA stand for in dental radiography?

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?

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?

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?

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?

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