California Lathing And Plastering Contractor (C-35 License) Practice Exam

Lead-backed lath has sheets of lead laminated on which side to block X-ray transmission?

On one side to block X-ray transmission On both sides In the middle Not used

Correct Answer:

On one side to block X-ray transmission

Explanation:

Lead acts as a radiation shield, so lead-backed lath is laminated on one side to place the shielding directly in the path of the X-ray beam toward the protected space. This single-sided backing provides the necessary attenuation while keeping weight and cost reasonable. Adding lead to both sides adds unnecessary weight and expense, and placing it in the middle wouldn’t position the shield effectively in the beam path. Not using any lead would fail to block X-ray transmission.

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