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Continuing Education — "The Action Level!®"

VOLUME 1(12), December 2004
Journal of Occupational and Environmental Hygiene

Answer the questions below and click "Submit".

Full Name:
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CASE STUDIES:

Time Variant Exposure Analysis (TVEA): A Measurement Tool for Characterizing Particulate Exposure Determinants in Construction
Andrew J. Kalil, Susan R. Woskie, Christina Holcroft, Michael Ellenbecker and Bryan Buchholz

1. Overall, exposure determinants related to diesel exhaust proved the
    most difficult particulate type for raters to agree on. True or False?

True
False
2. Examination of the 5-minute interval observation data indicates
    particulate sources during construction are limited at the start
    of the workday, increase in frequency midday and decrease in
    frequency as the end of the day approaches. True or False?
True
False
Use of a Directional Spray System Design to Control Respirable Dust and Face Gas Concentrations Around a Continuous Mining Machine
Gerrit V.R. Goodman and Douglas E. Pollock

3. During the field evaluation phase of this work, the residence time
    distribution of the tracer gas exhibited a pronounced spike under one
    set of conditions. This spike is indicative of complete and thorough
    mixing of the tracer gas and the ventilation airflow. True or False?

True
False
4. Among the three variables studied in the laboratory phase of this
    work, changes in which variable had the greatest impact on
    log-transformed dust levels at the mining machine operator?
a. curtain quantity
b. water pressure
c. curtain setback distance
Airborne Concentrations of Methylene Diphenyl Diisocyanate (MDI) in North American Wood Mills During the Manufacturing of Oriented Strand Board (OSB)
William J. Karoly, John J. Flatley, Ralph D. Stevenson and John D. Bowers

5. Surface wipe testing in OSB mills indicated that diisocyanate
    contamination is found:

a. in the QC labs, especially on bench tops and
          computer keyboards.
b. by the blender, forming line and hopper
          deck areas.
c. in the green end of the process area.
d. a and b
e. b and c
6. Cases of worker sensitization/occupational asthma to/from MDI
    in OSB mills are not well documented because:
a. the diagnoses are usually incomplete and not
          confirmed.
b. the information is confidential between doctor
          and patient.
c. when survey questionnaires are used to define
          asthma like symptoms, the symptoms are usually
          not clinically confirmed.
d. record keeping practices of mills are poor.
e. b, c and d
f. a and c

Laboratory and Field Evaluation of a SAW Microsensor Array for Measuring Perchloroethylene in Breath
William A. Groves and Chandran Achutan

7. The majority of absorbed perchloroethylene is metabolized to
    trichloroacetic acid and excreted in urine. True or False?

True
False
8. The current ACGIH® BEI® for tetrachloroethylene in end-exhaled
      breath is 5 ppm for a sample collected at the end of the first shift
      of the workweek. True or False?
True
False


Deadline for answers is December 24, 2004.

Answers will be available online at
http://www.acgih.org/products/joeh/alanswers.htm
on January 3, 2005.

 
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