DANB Radiation Health & Safety

Question 1

What is the main purpose of using a lead apron during dental x-rays?

Accepted Answer

To reduce scatter radiation exposure

Answer

A lead apron is a crucial protective device used during dental x-rays to shield the patient's torso and reproductive organs from unnecessary radiation. Its primary function is to absorb scatter radiation, which is radiation that has been deflected from the primary beam. This significantly reduces the patient's overall exposure and potential risk.

Question 2

Which tissue is most sensitive to radiation exposure?

Accepted Answer

Reproductive cells

Answer

Rapidly dividing cells are generally more sensitive to radiation damage, and reproductive cells (gonadal tissues) fall into this category. Exposure to radiation can cause genetic mutations or sterility. Therefore, it is critical to protect these areas with lead shielding during radiographic procedures to minimize risk.

Question 3

How should dental x-ray films be stored to maintain quality?

Accepted Answer

In a cool, dry area away from radiation

Answer

Dental x-ray films are sensitive to heat, humidity, and radiation, which can degrade their quality and lead to fogging or reduced image clarity. Storing them in a cool, dry environment, away from any sources of radiation or chemical fumes, helps preserve their emulsion. This ensures optimal diagnostic quality when the films are eventually exposed and processed.

Question 4

Which of the following helps reduce patient radiation exposure?

Accepted Answer

Using a rectangular collimator

Answer

A rectangular collimator significantly reduces patient radiation exposure by restricting the x-ray beam to the exact size and shape of the film or sensor. Unlike a round collimator, which produces a larger, circular beam, the rectangular shape minimizes the irradiated area. This reduces the amount of unnecessary tissue exposure, adhering to the ALARA principle.

Question 5

When is it safe for the dental assistant to remain in the room during an x-ray?

Accepted Answer

Only when standing behind a lead barrier

Answer

Dental assistants must always prioritize their safety during x-ray procedures. Remaining in the room is only safe if they are protected by a lead barrier or a wall thick enough to absorb radiation. This barrier prevents direct and scattered radiation from reaching the assistant, adhering to ALARA (As Low As Reasonably Achievable) principles for radiation safety.

DANB General Chairside Assisting (GC) Test Practice Test

DANB General Chairside Assisting (GC) Test Practice Test

DANB Radiation Health & Safety