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Radon concentration and working level in the Exploratory Studies Facility (ESF)

机译：探索性研究设施（EsF）中的氡浓度和工作水平

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Radon-222 ((sup 222)Rn) and (sup 222)Rn progeny working level (WL) monitoring in the Exploratory Studies Facility (ESF) was initiated to support regulatory compliance. Measurements were taken over two periods, in Test Alcove No. 1 of the ESF, about 60 m from the tunnel entrance. For both periods, (sup 222)Rn concentration was less than 10% of the Derived Air Concentration (DAC) set forth in DOE Order 5480.11. Thus, these assessments were sufficient to demonstrate regulatory compliance. Based on these findings, quarterly (sup 222)Rn and (sup 222)Rn progeny monitoring was initiated. Two systems each were employed for (sup 222)Rn and (sup 222)Rn progeny measurement. No significant differences were observed between the respective systems. An interesting finding was that at the time the measurements were taken, barometric pressure appeared to be the predominant factor controlling (sup 222)Rn concentration in the ESF. This was true even during periods of ventilation shutdown.

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