Safety Registry Practice Test

Lead shielding thickness is expressed in what unit?

Millimeters Pb equiv Centimeters Pb equiv Inches Pb equiv Meters Pb equiv

Correct Answer:

Millimeters Pb equiv

Explanation:

Lead shielding thickness is described as the lead equivalent thickness, meaning the amount of lead that would produce the same attenuation as the shielding material at a given radiation energy. The standard unit for this is millimeters of lead equivalent (mm Pb eq). Using mm Pb eq lets you compare different materials on a common scale and supports precise shielding design and regulatory compliance. While other units can describe attenuation, millimeters of lead equivalent is the conventional and most practical choice in practice. For example, a barrier stated as 2 mm Pb eq attenuates as if it were 2 millimeters of lead.

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