Radiation Health and Safety Flashcards

What is the ALARA principle in dental radiography?

Answer: As Low As Reasonably Achievable — minimizing radiation exposure

ALARA stands for As Low As Reasonably Achievable, a guiding principle requiring that radiation exposure be kept as minimal as possible while still obtaining diagnostic-quality images.

What is the maximum permissible dose (MPD) of radiation for occupationally exposed dental workers per year?

Answer: 50 mSv (5 rem)

The annual maximum permissible dose for occupationally exposed workers is 50 mSv (5 rem) for the whole body, as established by radiation safety guidelines.

Which type of radiation is most harmful to dental patients during radiographic procedures?

Answer: Scatter radiation

Scatter radiation, produced when the primary beam interacts with matter (the patient's tissues), is the most significant source of radiation exposure during dental radiography because it travels in all directions.

What is the purpose of a lead apron during dental radiography?

Answer: To protect radiosensitive organs from unnecessary radiation exposure

Lead aprons shield radiosensitive organs such as the thyroid, gonads, and bone marrow from unnecessary radiation exposure during dental radiographic procedures.

What is the recommended position for the dental assistant during X-ray exposure?

Answer: At least 6 feet away from the source and behind a barrier or at a 90-135 degree angle

The operator should stand at least 6 feet away from the X-ray source and position themselves at a 90-135 degree angle to the primary beam, or behind a protective barrier.

What type of dosimeter is commonly used to monitor radiation exposure for dental professionals?

Answer: Film badge or optically stimulated luminescence (OSL) dosimeter

Film badges and OSL dosimeters are the most common personal monitoring devices worn by dental professionals to track cumulative radiation exposure over time.