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Continuing Education — "The Action Level!®"

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

Answer the questions below and click "Submit".

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CASE STUDIES:

Correction of Sampler-to-Sampler Comparisons Based on Aerosol Size Distribution
Patrick O'Shaughnessy, Wan-Yueh Lo, Vijay Golla, Jason Nakatsu, Marvin Tillery and Stephen Reynolds

1. The aerosol concentrations measured by two different aerosol
    sampling devices were compared and a ratio between the two
    calculated. On a subsequent investigation, the same procedure
    resulted in a much different ratio. What aspect of the aerosol
    probably changed to cause the change in the ratios?

a. particle density
b. particle shape
c. particle size distribution
d. particle concentration
2. The collection efficiency curve for the closed face cassette falls
    below that of the IOM inhalable sampler for larger particles.
    Therefore, although it represents a "total" sampler, the closed face
    cassette will provide a measure of aerosol concentration that is less
    than the measurement made by the IOM for the same aerosol
    measured. True or False?
True
False
Control of Methyl Methacrylate During the Preparation of Orthopedic Bone Cements
Leslie J. Ungers, Timonthy Vendrely and C. Barnes

3. This study indicates that, as the efficiency of an engineering control
    improves, the sample distribution of any measured emissions:

a. shifts from normal to lognormal
b. shifts from lognormal to normal
c. does not change
4. Design changes to bone cement mixing appliances have achieved
    mean reductions in the breathing zone concentrations of methyl
    methacrylate by as much as:
a. 50%
b. 73%
c. 90%
d. 95%
Relationships Between Inhalable, Thoracic and Respirable Aerosols of Metalworking Fluids
Dave Verma

5. The relationship between Inhalable and Thoracic fractions of the
    Metalworking Fluids (MWFs) aerosols is important since future
    occupational exposure limits will likely be based on inhalable
    or thoracic fractions. True or False?

True
False
6. The Respicon Sampler can simultaneously collect inhalable,
    thoracic and respirable fractions of an aerosol. True or False?
True
False
Indoor Air Quality in Restaurants With and Without Designated Smoking Rooms
Sheryl Milz, Farhang Akbar-Khanzadeh, April Ames, Sara Spino, Christopher Tex and Kathryn Lanza

7. A referenced study reported that the most effective control methods
    in smoking areas included physical separation, exhaust to the
    outside, and no air recirculation. True or False?

True
False
8. What is the percentage of CO2 measurements exceeding the
    ASHRAE criterion level of 1,000 ppm for all five sites combined?
a. 99.2%
b. 58.9%
c. 41.1%
d. 25.6%
A Web Tool for the Identification of Potential Interactive Effects of Chemical Mixtures
Adolf Vyskocil, Daniel Drolet, Claude Viau, François Lemay, Gilles Lapointe, Robert Tardif, Ginette Truchon, Marc Baril, Normand Gagnon, France Gagnon, Denis Bégin and Michel Gérin

9. Additive mixture formula of ACGIH® applies to simultaneous
    exposure for hazardous agents with:

a. TLV-TWA only
b. TLV-STEL only
c. TLV-Ceiling only
d. TLV-TWA and TLV-Ceiling
e. All the TLV®
10. The nature of interactions between two chemical substances
      depends on: i) doses of those chemicals; ii) sequence of exposure
      to chemicals; iii) time interval between exposure to each chemical;
      iv) toxicokinetics of chemicals; or v) toxicodynamics of chemicals.
a. iv and v
b. i, ii, and iii
c. ii and iii
d. i, ii, iii, iv and v
Continuous vs. Episodic Hydration in Encapsulating Protective Coveralls
Phillip Bishop, Eric Jones and James Green

11. What was the impact of prompting a subset of the subjects to drink
      while using the through-the-mask drinking system?

a. No change, the subjects did well anyway
b. A further improvement in water balance
c. More drinking, but greater urine production
d. No change in hydration, but subjects felt much
          better
12. This study found that the through-the-gas-mask drinking system
      had what impacts?
a. Improved steadiness for the semi-permeable
          coveralls
b. Improved total work time for the semi-permeable
          coveralls
c. Reduced sweating
d. Significantly increased work time


Deadline for answers is April 30, 2007.

Answers will be available online at
http://www.acgih.org/products/joeh/alanswers.htm
on May 11, 2007.

 
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