DANB Radiation Health and Safety (RHS) Exam 2025 – 400 Free Practice Questions to Pass the Test

Question: 1 / 400

What is the recommended lead thickness for protective barriers in dental radiography?

1/32 inch (0.8 mm)

1/16 inch (1.5 mm)

The recommended lead thickness for protective barriers in dental radiography is 1/16 inch (1.5 mm). This thickness effectively attenuates scatter radiation produced during dental imaging procedures such as X-rays. The use of this specific lead thickness is based on guidelines established by various health and safety organizations, including the National Council on Radiation Protection and Measurements (NCRP).

The choice of 1/16 inch is ideal because it strikes a balance between adequate protection for both dental staff and patients while also considering practicality and cost. Thicker barriers may not be necessary for the lower energy X-rays typically used in dental radiography, while thinner barriers would not provide sufficient protection against radiation exposure.

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1/8 inch (3.2 mm)

1/4 inch (6.4 mm)

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