The use of a statistics-based sampling protocol to characterize worker exposures to airborne beryllium is required by 10 CFR 850, as is routine surface sampling to verify compliance with the housekeeping standard. The rule is performance based and does not prescribe statistical protocols. General guidance is provided in DOE G 440.1-7A, "Implementation Guide for use with 10 CFR 850, Chronic Beryllium Disease Prevention Program," which states:
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