California Registered Dental Assistant (RDA) Written Practice Exam

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What is the thickness of the lead collimator in dental x-ray machines?

1/8 inch
1/2 inch
1/16 inch
1/4 inch

The correct answer is: 1/16 inch

The correct answer is 1/16 inch. This thickness is specifically designed for dental x-ray machines, as it provides just the right amount of shielding without causing excessive exposure to radiation. Option A (1/8 inch) is too thick and may result in increased radiation exposure for patients. Option B (1/2 inch) is too thick and would make the machine overly heavy and difficult to maneuver. Option D (1/4 inch) is a reasonable thickness, but it is not the standard for lead collimators in dental x-ray machines. Therefore, 1/16 inch is the best option.