Tracer gas as an aid in mine ventilation analysis
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      "The Bureau of Mines has successfully used sulfur hexafluoride (sf6) as a tracer gas to measure mine air flows under conditions where conventional methods have failed. Sf6 was employed experimentally to measure accurately recirculation of return into intake air caused by leakage through an old stoped area, to check for potential leakage from an adjacent mine, to trace 10,000 cfm of "lost" air from an intake airway, and to measure transit air time through uranium mines. It proved useful as a means of accurately measuring airflow volumes in airways of large cross section and very low flow velocity and in determining the recirculation resulting from underground cooling plants." - NIOSHTIC-2 NIOSHTIC no. 10000743
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