CRA Radiation Physics & Safety Flashcards
6 cards from real CRA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CRA Radiation Physics & Safety flashcards as text
Which type of ionizing radiation has the GREATEST penetrating power and requires the most shielding?
Answer: Gamma rays
Gamma rays are high-energy electromagnetic radiation with very high penetrating power, requiring dense materials like lead for effective shielding.
The ALARA principle in radiation safety stands for:
Answer: As Low As Reasonably Achievable
ALARA — As Low As Reasonably Achievable — is the guiding principle that radiation exposure should be minimized as much as practically possible.
The annual occupational whole-body effective dose limit for radiation workers in the United States, as set by the NRC, is:
Answer: 5 rem (50 mSv)
The NRC and NCRP set the annual occupational whole-body effective dose limit at 5 rem (50 mSv) for radiation workers.
Which radiation monitoring device is worn by radiology staff to measure cumulative occupational radiation exposure?
Answer: Dosimeter badge (OSL or TLD)
Optically stimulated luminescence (OSL) and thermoluminescent dosimeters (TLD) worn as badges measure and record an individual's cumulative radiation dose.
In radiographic imaging, the three cardinal principles of radiation protection are:
Answer: Time, distance, and shielding
Time (minimize exposure time), distance (maximize distance from source), and shielding (use protective barriers) are the three cardinal principles of radiation protection.
The inverse square law states that radiation intensity is related to distance by which relationship?
Answer: Intensity decreases proportionally to the square of the distance
The inverse square law states that radiation intensity decreases proportionally to the square of the distance from the source (I ∝ 1/d²).