Certified Industrial Hygienist (CIH) [exam-quick]

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A key limitation of using Phase Contrast Microscopy (PCM) via NIOSH Method 7400 for analyzing asbestos samples is its inability to:

Quantify fibers smaller than 5 µm in length. Be used for personal air sampling. Differentiate between asbestos and non-asbestos fibers. Achieve a low enough detection limit for clearance sampling.

Correct Answer:

Differentiate between asbestos and non-asbestos fibers.

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