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Continuing Education — "The Action Level!®"

VOLUME 6(1), January 2009
Journal of Occupational and Environmental Hygiene

Answer the questions below and click "Submit".

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CASE STUDIES:

Relationships among Particle Number, Surface Area, and Respirable Mass Concentration in Automotive Engine Manufacturing
William A. Heitbrink, Douglas E. Evans, Bon Ki Ku, Andrew D. Maynard, Thomas J. Slavin and Thomas M. Peters

1. The active surface area concentration was measured by:

a. scanning electron microscopy
b. optical microscopy
c. a diffusion charger
d. a scanning mobility particle sizer
2. According to the theoretical analysis, active surface area
    and geometric surface are equivalent. True or False?
True
False
Occupational Noise Exposure and Hearing Protector Use in Canadian Lumber Mills
Hugh W. Davies, Kay Teschke, Susan M. Kennedy, Murray R. Hodgson, C. Eng and Paul A. Demers

3. Predictive modeling showed that working in a personal enclosure
    ("booth") in a sawmill reduced average noise exposure for those
    inside by 15-20 dBA. True or False?

True
False
4. Despite incomplete adoption of engineered noise controls,
    hearing protection device use was virtually universal in the study
    population and, therefore, provided excellent protection against
    noise in the lumber mill environment studied. True or False?
True
False
Measurement Capability of Field Portable Organic Vapor Monitoring Instruments Under Different Experimental Conditions
Christopher C. Coffey, Terri A. Pearce, Robert B. Lawrence, Judith B. Hudnall, James E. Slaven and Stephen B. Martin, Jr.

5. Under the experimental conditions used in this study, the
    DROVM group demonstrating the overall greatest comparability to
    the average concentrations measured with charcoal tubes was:

a. ppbRAE
b. MultiRAE
c. SapphIRe
d. TVA PID
6. The DROVM variability prevented conclusive determinations
    about the effects of temperature, RH and concentration on
    instrument performance. True or False?
True
False
Efficiency of Sampling and Analysis of Asbestos Fibers on Filter Media: Implications for Exposure Assessment
Daniel A. Vallero, John R. Kominsky, Michael E. Beard and Owen S. Crankshaw

7. When conducting an activity-based asbestos exposure study
    based on a personal breathing-zone sampling technique, the best
    overall type of filter to capture fibers is:

a. 0.45 µm pore mixed cellulose ester
b. 0.8 µm pore mixed cellulose ester
c. 0.45 µm pore polycarbonate
d. 1.2 µm pore mixed cellulose ester
8. A 13% average increase in chrysotile fiber counts (etching
    times < 16 m) appeared in which of the following fiber size ranges
    (Vallero et al., 2008):
a. > 10 µm in length
b. > 5 – 10 µm in length
c. > 0.5 – 5 µm in length
d. = 0.5 µm in length
Quartz and Dust Exposure in Swedish Iron Foundries
Lena Andersson, Ing-Liss Bryngelsson, Carl-Göran Ohlson, Peter Nayström, Bengt-Gunnar Lilja and Håkan Westberg

9. How many times is the protection factor of the respirator
    reduced by 3-day stubble?

a. 2
b. 10
c. 100
10. What is the definition of the actual exposure?
a. All exposures in the surrounding air
b. The exposures outside the respirator
c. The exposure the worker inhales
N95 and P100 Respirator Filter Efficiency Under High Constant and Cyclic Flow
Jonathan Eshbaugh, Paul Gardner, Aaron Richardson and Kent Hofacre

11. What was the most penetrating particle size found for the
      N95 cartridge and facepiece filters at most flow rates?

a. 0.05 µm
b. 0.02 µm
c. 0.2 µm
d. 0.3 µm
12. At constant and cyclic conditions, penetration generally
      increased with an increase in flow. True or False?
True
False
Reducing Silica and Dust Exposures in Construction During Use of Powered Concrete Cutting Hand Tools: Efficacy of Local Exhaust Ventilation on Hammer Drills
S. Shepherd, S.R. Woskie, C. Holcroft and M. Ellenbecker

13. The results of this study indicate one of the following about
      the difference between a large and smaller vacuum source:

a. Workers preferred to use the larger vacuum
          source.
b. Both reduced airborne exposure to respirable
          crystalline silica while drilling concrete but
          differed in the ability to maintain airflow over
          a longer period.
c. The differences in airflow depended on the length
          of hose being used.
d. There was no difference between them.
14. The average reduction in airborne respirable crystalline silica
      using any control combination averaged 94%, yet two of the
      control combinations did not reduce the average concentration
      to below the current ACGIH® TLV® of 0.025 mg/m3.
      True or False?
True
False


Deadline for answers is January 31, 2009.

Answers will be available online at
http://www.acgih.org/products/joeh/alanswers.htm
on February 11, 2009.

 
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