RHS EXAM: RADIATION SAFETY FOR PATIENTS AND OPERATORS:

The annual maximum accumulated dose (MAD) of radiation for dental assistant is based on which of the following calculations? Correct Answer: Age minus 18 times 5 rems/year. The population most susceptible to radiation damage is Correct Answer: Infants. Cells most suspectable to radiation damage are Correct Answer: Bone marrow. The main purpose of using a lead apron with a thyroid collar when exposing dental radiographs is to protect the patient from Correct Answer: Scatter radiation. Which of the following can help to protect patients from excess radiation damage to tissues? Correct Answer: High kVp. The purpose of intensifying screens is to Correct Answer: decrease the amount of the radiation exposure. The diameter of the cone-shaped beam produced from a circular collimator is Correct Answer: 2.75 inches. Which of the following cells exposed to radiation may be associated with leukemia? Correct Answer: Somatic. Which of the following tissues is the most highly radiosensitive? Correct Answer: Skin. Which of the following landmarks is useful when mounting films in the maxillary central area? Correct Answer: Anterior nasal spine. Radiation injury results from Correct Answer: Exposure. If there are no teeth to serve as guides, which of the following landmarks indicates a maxillary molar area radiograph? Correct Answer: Tuberosity. Which of the following PID produces the greatest amount of secondary radiation? Correct Answer: Closed-end plastic cone. Radiation injury can be measured by Correct Answer: Dose rate. ALARA is primarily concerned with the radiation that is Correct Answer: artificial. The amount of which of the following is used in determining the degree of radiation injury? Correct Answer: Tissue irradiated.