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An investigation of physical factors...

Lee, Eungyoung.

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An investigation of physical factors for estimating exposure to airborne contaminants.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	An investigation of physical factors for estimating exposure to airborne contaminants./
Author:	Lee, Eungyoung.
Description:	169 p.
Notes:	Director: Charles E. Gene Feigley.
Contained By:	Dissertation Abstracts International65-08B.
Subject:	Environmental Sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3142826
ISBN:	9780496006410

An investigation of physical factors for estimating exposure to airborne contaminants.
Lee, Eungyoung.

An investigation of physical factors for estimating exposure to airborne contaminants. - 169 p.

Director: Charles E. Gene Feigley.

Thesis (Ph.D.)--University of South Carolina, 2004.

The findings from this investigation indicate that incorporating the effect of physical factors in exposure assessment promises improved accuracy and better understanding of uncertainties.

ISBN: 9780496006410Subjects--Topical Terms:

676987
Environmental Sciences.

An investigation of physical factors for estimating exposure to airborne contaminants.
LDR:03250nam 2200313 a 45 001 967706
005 20110915
008 110915s2004 eng d
020 $a 9780496006410
035 $a (UMI)AAI3142826
035 $a AAI3142826
040 $a UMI $c UMI
100 1 $a Lee, Eungyoung. $3 1291574
245 1 3 $a An investigation of physical factors for estimating exposure to airborne contaminants.
300 $a 169 p.
500 $a Director: Charles E. Gene Feigley.
500 $a Source: Dissertation Abstracts International, Volume: 65-08, Section: B, page: 3974.
502 $a Thesis (Ph.D.)--University of South Carolina, 2004.
520 $a The findings from this investigation indicate that incorporating the effect of physical factors in exposure assessment promises improved accuracy and better understanding of uncertainties.
520 $a Insufficient characterization and development of methods for estimating exposure to airborne contaminants often increases uncertainties and decreases accuracy and precision of personal exposure estimates. The investigation of fundamental physical factors that influence exposure estimates can minimize errors and enhance understanding of the impact of those factors on exposure assessment and control. Here four physical factors, temperature, worker's location, air inlet type, and worker's activity, were investigated in a steady-state experimental room (volume = 19.2m3). A tracer gas (99.5% propylene), continuously injected at a constant rate through the top of a 1-m high pedestal, was monitored automatically at 144 sampling points with a photoionization detector. Three constant dilution air flowrates, 5.50 m3/min, 3.27 m3/min and 0.88 m3/min, were employed. The north wall was heated or cooled to represent a building's external wall. A heated mannequin was used to investigate the impact of a stationary worker's presence. Also, the concentration outside the facepiece of an air-supplied respirator was measured for a person at various locations and orientations, and for various activities.
520 $a Because simulated summer and winter conditions generated greatly different dispersion patterns at breathing zone level, occupational hygiene professionals should not assume that monitoring data from a single season is representative of the entire year. The worker presence influenced the contaminant dispersion pattern only in the occupied portion of the room, and breathing zone concentrations depended strongly on the worker's location. The ceiling diffuser inlet was more efficient than the wall jet because only a small volume immediately above the source had high tracer concentrations, and the rest of the room was virtually well mixed. The experimental results clearly demonstrated the importance of basing exposure estimates on personal sampling rather than area sampling whenever possible because of the impact of worker orientation and movement on the breathing zone concentrations.
590 $a School code: 0202.
650 4 $a Environmental Sciences. $3 676987
650 4 $a Health Sciences, Occupational Health and Safety. $3 1017799
650 4 $a Health Sciences, Public Health. $3 1017659
690 $a 0354
690 $a 0573
690 $a 0768
710 2 0 $a University of South Carolina. $3 1017477
773 0 $t Dissertation Abstracts International $g 65-08B.
790 $a 0202
790 1 0 $a Feigley, Charles E. Gene, $e advisor
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3142826