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Continuing Education — "The Action Level!®"

VOLUME 3(1), January 2006
Journal of Occupational and Environmental Hygiene

Answer the questions below and click "Submit".

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CASE STUDIES:

Evaluation of Respirator Filters for Asbestos Fibers
Yung-Sung Cheng, Thomas D. Holmes and BiJian Fan

1. For charge-neutralized, low-efficiency filter cartridges, asbestos
    fibers penetrate ____________ compared to spherical particles
    with a mean particle size of 0.3 micrometers in diameter.

a. more
b. less
Bacterial Plume Emanating from the Air Surrounding Swine Confinement Operations
Christopher F. Green, Shawn G. Gibbs, Patrick M. Tarwater, Linda C. Mota and Pasquale V. Scarpino

2. It is common practice for swine confined animal feeding operations
    to use subtherapeutic antibiotics to promote weight gain and
    disease prophylaxis. True or False?

True
False
3. This study found that the total number of culturable bacteria was still
    above upwind levels 250 meters downwind of the facility and thus
    posed a health risk to the community at large. True or False?
True
False
Potential Foreseeable Uses of Petrochemical Products Can Result in Significant Benzene Exposures: MSDSs Must List Benzene as an Ingredient
Melvyn Kopstein

4. Which of the following choices is NOT listed among well-known
    exposure models available to manufacturers and industrial
    hygienists:

a. well-mixed
b. box
c. turbulent diffusion
d. molecular diffusion
e. laminar multi-stage
Errors Associated with Three Methods of Assessing Respirator Fit
Christopher C. Coffey, Robert B. Lawrence, Ziqing Zhuang, Matthew G. Duling and Donald L. Campbell

5. The alpha error of a fit test method is not important in the context of
    a normal respiratory protection program. True or False?

True
False
6. Table II indicates that the error rates for all three fit test methods
    were quite different. True or False?
True
False
Indoor and Outdoor Air Quality Assessment of Four Wastewater Treatment Plants
Joung Ae Lee, John Johnson, Stephen Reynolds, Peter Thorne and Patrick O'Shaughnessy

7. Variability in concentration of hydrogen sulfide gas was NOT
    attributed to which of the following:

a. humidity
b. total incoming flow
c. unit operation involved
d. operator technique
8. Using 17% of 105 measurements for hydrogen sulfide that exceed
    the proposed limit, the best conclusion concerning a study like
    this would be:
a. Revise the Threshold Limit Value upward.
b. Rethink the basis for chronic health problems.
c. Suggest additional investigations covering
          wastewater treatment operators are warranted.
d. Conclude the retrospective exposure assessment
          is flawed.
Dust in the Underground Railway Tunnels of an Italian Town
G. Ripanucci, M. Grana, L. Vicentini, A. Magrini and A. Bergamaschi

9. Silica dust used in the carriages emergency braking system is
    capable of causing a dispersion of quartz in the air in percentages
    more than 1%. True or False?

True
False
10. What is the average iron content (percentage) on the platforms and
      in the tunnels of the underground railway system with respect to all
      the airborne metallic dust?
a. 90%
b. 50%
c. 20%


Deadline for answers is January 31, 2005.

Answers will be available online at
http://www.acgih.org/products/joeh/alanswers.htm
on February 13, 2006.

 
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