Radiation and Safety Flashcards
7 cards from real ARRT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Radiation and Safety flashcards as text
What is the annual occupational effective dose limit for radiation workers in the US?
Answer: 50 mSv
The NCRP and NRC set the annual occupational effective dose limit at 50 mSv (5 rem) per year.
Which type of radiation has the greatest penetrating power?
Answer: Gamma rays
Gamma rays are highly penetrating electromagnetic radiation requiring dense shielding such as lead or thick concrete.
The ALARA principle in radiation protection stands for:
Answer: As Low As Reasonably Achievable
ALARA means As Low As Reasonably Achievable, guiding practitioners to minimize radiation exposure while maintaining image quality.
Which device is most commonly used to measure personnel radiation exposure over time?
Answer: OSL dosimeter
Optically stimulated luminescence (OSL) dosimeters are the standard personnel monitoring device used by radiologic technologists.
What shielding material is most commonly used in radiographic rooms due to its high atomic number and density?
Answer: Lead
Lead is the standard primary shielding material because its high atomic number (82) and density make it highly effective at attenuating X-rays.
Protective lead aprons used in fluoroscopy typically provide an equivalent attenuation of:
Answer: 0.50 mm Pb
Standard lead aprons are rated at 0.50 mm Pb equivalent, providing approximately 88% attenuation of scatter radiation at diagnostic energies.
Which of the following is the most radiosensitive tissue according to the law of Bergonié and Tribondeau?
Answer: Bone marrow cells
Bone marrow cells are highly mitotic and undifferentiated, making them among the most radiosensitive tissues in the body.