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Continuing Education — "The Action Level!®"

VOLUME 4(2), February 2007
Journal of Occupational and Environmental Hygiene

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CASE STUDIES:

A Psychoacoustical Model for Specifying the Level and Spectrum of Acoustic Warning Signals in the Workplace
Christian Giguère, Chantal Laroche, Catherine Sabourin, Ariel Gagné and Mélissa Elyea

1. Among the important factors to consider for the proper design and
    use of warning sounds in the workplace, which one is not
    specifically addressed by the psychoacoustic tool
    "Detectsound"?

a. Hearing status of the workers
b. Noise field at each workstation
c. Use of hearing protectors
d. Sense of urgency conveyed by the warning
          sounds
e. Level and spectrum of the warning sounds
2. What potential problem could arise when workers with noise induced
    hearing loss are fitted with high attenuation hearing protective
    devices?
a. Elevated absolute thresholds may render warning
          sounds inaudible
b. Elevated masked thresholds may render warning
          sounds inaudible
c. Loss of sense of urgency conveyed by the warning
          sounds
d. Loss of the distinctive character of the warning
          sounds
e. None of the above
Airborne Methylene Diphenyl Diisocyanate (MDI) Concentrations Associated with the Application of Polyurethane Spray Foam in Residential Construction
Jacques Lesage, Jennifer Stanley, William J. Karoly and Fran W. Lichtenberg

3. In some of the air samples collected, low but measurable airborne
    concentrations of MDI were detected even at 60 minutes after spray
    application ceased. True or False?

True
False
4. Particle size data indicated the need for the use of a back-up filter
    behind the impingers when sampling for MDI because most of the
    overspray particulates were less than 2 microns. True or False?
True
False
Task and Time-Dependent Weighting Factors in a Retrospective Exposure Assessment of Chemical Laboratory Workers
Scott Henn, David Utterback, Andrea Markey, Kathy Waters and William Tankersley

5. What information was used in determining if a worker was a
    Chemical Laboratory Worker?

a. Job title
b. Department
c. Location
d. Two of the above
e. All of the above
6. What was the method used to determine data values that were
    below the limit of detection (LOD)?
a. LOD/2
b. LOD/square root of 2
c. Probability Plot
d. Maximum Likelihood Estimate
Effect of Aviation Snip Design and Task Height on Upper Extremity Muscular Activity and Wrist Posture
Dan Anton, John C. Rosecrance, Fredric Gerr, Jonathan Reynolds, Alysha Meyers and Thomas M. Cook

7. Which aviation snip was found to be the best at reducing physical
    (biomechanical) risk factors with use at waist height?

a. Standard circular snip
b. Straight snip
c. Offset snip
d. None of the above
8. In general, aviation snip design had a greater effect on muscle
    activity than work height. True or False?
True
False
Performance of a Full Facepiece Air Purifying Respirator Against Lead Aerosols in a Workplace Environment
Larry Janssen and Jeanne Bidwell

9. Workers exposed to lead aerosols at concentrations up to 50 times
    the permissible exposure limit (PEL) of 50 µg/m3 are required
    to wear, at a minimum:

a. a full facepiece, negative pressure air purifying
          respirator with organic vapor cartridges
b. a full facepiece, negative pressure air purifying
          respirator with class 100 filters
c. a half facepiece, negative pressure air purifying
          respirator with class 100 filters
d. a full facepiece, negative pressure air purifying
          respirator with class 95 filters
10. A WPF, or workplace protection factor, in which Ci is the
     in-facepiece concentration and Co is the outside concentration,
     is calculated by:
a. dividing the Ci by the Co
b. dividing the Ci by half the Co
c. dividing the Co by the Ci
d. multiplying the Co by twice the Ci


Deadline for answers is February 28, 2007.

Answers will be available online at
http://www.acgih.org/products/joeh/alanswers.htm
on March 12, 2007.

 
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