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Relationship of sampling efficiency for manikin-mounted personal samplers to efficiency measurements made independent of manikin.

Authors
Smith-J; Bird-A
Source
J Aerosol Sci 2002 Sep; 33(9):1235-1259
NIOSHTIC No.
20022425
Abstract
The goal of this study was to determine if measurement of the airflow approaching manikin-mounted personal samplers can be used to predict their sampling efficiency using efficiency measurements made independently of the manikin. The first part of the work involved the determination of the velocity and direction of airflow at specific locations (where personal samplers would be located) around a human-like manikin by using laser-Doppler velocimetry (LDV) at two wind speeds and three orientations of the manikin with respect to the wind. Sampling-efficiency measurements for two personal samplers, the IOM (SKC, Inc., Eighty-Four, PA) and GSP (Strohlein GmbH and Co., Kaarst, Germany) for a 70 m (mass median diameter) aerosol were made both independently of the manikin for a range of wind speeds and directions and while mounted on the manikin for the wind speeds and directions studied by LDV. The efficiency measurements made independently of the manikin were adjusted by using the local-manikin concentration experienced by the sampler to calculate an approximated efficiency for manikin-mounted personal samplers that experienced a similar wind speed and direction. The approximated efficiency agreed with the measured efficiency of the manikin-mounted samplers when the manikin faced the wind or was at 90 to the wind. Some assumptions were required to obtain agreement when the manikin was at 180 to the wind probably due to the turbulent nature of the flow with the manikin at this angle to the wind. This technique may be useful in simplifying testing procedures and in developing performance criteria for inhalable dust samplers since clearly defined test conditions can be specified.
Keywords
Air-flow; Air-sampling-equipment; Air-monitoring; Personal-protective-equipment; Humans; Sampling-equipment; Sampling-methods
Contact
Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Division of Applied Research and Technology, 4676 Columbia Parkway, Cincinnati, OH 45226, USA
CODEN
JALSB7
Publication Date
20020401
Document Type
Journal Article
Email Address
jps3@cdc.gov
Fiscal Year
2002
NTIS Accession No.
NTIS Price
Issue of Publication
9
ISSN
0021-8502
NIOSH Division
HELD
Priority Area
Research Tools and Approaches: Exposure Assessment Methods
Source Name
Journal of Aerosol Science
State
OH; WV
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