Which statement describes TEM usage in asbestos analysis?

Which statement describes TEM usage in asbestos analysis?

• A. It is used as a backup to PLM because PLM may miss extremely narrow fibers
• B. It is never used in asbestos analysis
• C. It replaces PLM as the primary method
• D. It is used only for SEM samples

Answer: (B)

In asbestos analysis, polarized light microscopy (PLM) is the standard method for identifying asbestos fibers in bulk materials; transmission electron microscopy (TEM) is not part of routine asbestos analysis. The statement that TEM is never used reflects that, within typical inspection practice, TEM isn’t employed as a routine backup or replacement for PLM. TEM can provide high-resolution detail, but it’s expensive, time-consuming, and reserved for specialized confirmatory work in limited cases. The other options imply TEM has a routine backup role, replaces PLM, or is tied to SEM samples, which doesn’t align with standard practice in this context.

In asbestos analysis, polarized light microscopy (PLM) is the standard method for identifying asbestos fibers in bulk materials; transmission electron microscopy (TEM) is not part of routine asbestos analysis. The statement that TEM is never used reflects that, within typical inspection practice, TEM isn’t employed as a routine backup or replacement for PLM. TEM can provide high-resolution detail, but it’s expensive, time-consuming, and reserved for specialized confirmatory work in limited cases. The other options imply TEM has a routine backup role, replaces PLM, or is tied to SEM samples, which doesn’t align with standard practice in this context.