California Registered Dental Assistant (RDA) Written Practice Exam

The California Radiological Safety Code requires the patient protection apron to contain at least what thickness of lead?

1. .50 mm

2. .25 mm

3. .75 mm

4. 1 mm

The correct answer is: .25 mm

The California Radiological Safety Code requires the patient protection apron to contain at least a thickness of .25 mm of lead in order to adequately protect the patient from radiation exposure. Option A of .50 mm is too thick and may be unnecessarily heavy and uncomfortable for the patient to wear. Option C of .75 mm is also thicker than necessary, and the extra weight may cause additional strain on the patient. Option D of 1 mm may also provide enough protection, but it is not required by the safety code and may be more expensive and less comfortable for patients. Therefore, B is the most appropriate and accurate answer.