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There is a lack of consensus about whether the current exposure standard in 10 CFR 850 (i.e., 2 µg Be/m3) is adequate to protect workers. Although this issue was recognized during the rulemaking process for 10 CFR 850, it was also recognized that the scientific data needed to establish a different limit was lacking. The rule therefore establishes an action level (AL) that is one-tenth of this level, i.e., 0.2 µg Be/m3. Therefore, work place levels shall be maintained below the AL and as low as practical. Visitors to beryllium work areas should be discouraged unless essential to the mission in question.
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