PCM counting requires a minimum of how many fibers?

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Multiple Choice

PCM counting requires a minimum of how many fibers?

Explanation:
PCM counting estimates the fiber concentration by counting fibers on a filter, so the reliability of the result depends on having a sufficient number of counted fibers. Because the counts follow Poisson statistics, the precision improves as more fibers are counted. The relative standard error is about 1 over the square root of the count, so counting at least 100 fibers gives a reasonable level of precision for routine exposure assessments. Fewer than 100 fibers would produce too much uncertainty, while 100 fibers is the minimum that standard practice uses to ensure a meaningful, reproducible result.

PCM counting estimates the fiber concentration by counting fibers on a filter, so the reliability of the result depends on having a sufficient number of counted fibers. Because the counts follow Poisson statistics, the precision improves as more fibers are counted. The relative standard error is about 1 over the square root of the count, so counting at least 100 fibers gives a reasonable level of precision for routine exposure assessments. Fewer than 100 fibers would produce too much uncertainty, while 100 fibers is the minimum that standard practice uses to ensure a meaningful, reproducible result.

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