Field Group - Sample Accuracy

Comparison of Tracer Gas Concentrations Taken in a Wind Tunnel at the Mouth of a Mannequin to Values Found at Its Lapel and Cheek

The purpose of this thesis was to compare the results of sampling at two different locations on a mannequin, cheek and lapel, to the "true breathing concentration" measured at the mouth, and to evaluate the effect of different cross draft velocities and contaminant source locations on the accuracy of cheek and lapel samples. The results showed that samples collected at the traditional lapel location generally over-predicted inhalation concentrations, except when the contaminant source was located at chest height, where lapel samples under-predicted mouth concentrations. Cheek samples, on the other hand, were more representative of mouth (i.e. breathing zone) concentrations.

Guffey SE, Flanagan ME, van Belle G. Air sampling at the chest and ear as representative of the breathing zone. AIHAJ. 2001 Jul-Aug;62(4):416-27.

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