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Continuing Education — "The Action Level!®"

VOLUME 10(9), September 2013
Journal of Occupational and Environmental Hygiene


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CASE STUDIES:

Task-Specific Noise Exposure During Manual Concrete Surface Grinding in Enclosed Areas - Influence of Operation Variables and Dust Control Methods
Farhang Akbar-Khanzadeh, April L. Ames, Sheryl A. Milz and Mahboubeh Akbar-Khanzadeh

1. Assuming an 8-hour workshift, the results of this study
    indicated that noise exposure levels during concrete grinding
    in enclosed areas:

a. did not exceed the recommended exposure limits.
b. exceeded the recommended exposure limits and
          workers should be protected accordingly.
c. exceeded the recommended exposure limits
          but currently there are no methods to protect
          exposed workers.
d. cannot be determined properly since the area has
          high diffusive noise.
2. The results of this study suggested that the noise levels:
a. significantly increased when LEV-grinding
          methods were used as opposed to uncontrolled-
          grinding methods.
b. significantly increased when wet-grinding methods
          were used as opposed to uncontrolled-grinding
          methods.
c. were significantly reduced as the grinding
          cup wheel size (diameter) decreased.
d. Both a and b
Performance Evaluation of Selected N95 Respirators and Surgical Masks When Challenged with Aerosolized Endospores and Inert Particles
Craig S. Davidson, Christopher F. Green, Shawn G. Gibbs, Kendra K. Schmid, Adelisa L. Panlilio, Paul A. Jensen and Pasquale V. Scarpino

3. The results of our study utilizing a manikin head form acts
    as an approximation for a human subject wearing what
    type of N95 respirator?

a. Well fitting
b. Poorly fitting
c. Damaged
d. Fit tested
4. Differences in relative efficiency of the N95 respirator and
    surgical mask models were shown for experiments conducted
    with what type of aerosolized particles?
a. B. anthracis Sterne strain endospores
b. Sodium chloride particles
c. Wood particles
d. Titanium dioxide
Field Assessment of Enclosed Cab Filtration System Performance Using Particle Counting Measurements
John A. Organiscak, Andrew B. Cecala and James D. Noll

5. Particle count testing unoccupied enclosed cabs at the
    maximum HVAC fan speed setting during nonproduction
    periods provided:

a. a reliable test method for benchmarking cab
          protection factor performance.
b. the cab protection factor performance expected
          during equipment operation.
c. the optimal cab protection factor performance.
d. a and b
e. a and c
6. A decrease in enclosed cab pressure is an indication that:
a. the intake air into the cab decreased because
          of filter loading.
b. the cab enclosure seals are damaged or worn.
c. the cab protection factor decreased.
d. either a or b
e. either a or c
Laboratory Faceseal Leakage Evaluation of N95 Filtering Facepiece Respirators Against Nanoparticles and "All Size" Particles
Ziqing Zhuang, Michael S. Bergman, Benjamin C. Eimer and Ronald E. Shaffer

7. These data suggest that faceseal leakage for negatively
    charged ~40–60 nm nanoparticles is greater than the faceseal
    leakage for charged and uncharged 20 to > 1,000 nm
    particles. True or False?

True
False
8. When the PortaCount Plus is used with the N95-Companion
    accessory, the resulting fit factor is reflective of:
a. inward leakage.
b. faceseal leakage.
c. a qualitative test.
The Hierarchy of Environmental Health and Safety Practices in the U.S. Nanotechnology Workplace
Cassandra D. Engeman, Lynn Baumgartner, Benjamin M. Carr, Allison M. Fish, John D. Meyerhofer, Terre A. Satterfield, Patricia A. Holden and Barbara Herr Harthorn

9. This article reports survey responses from private companies
    that use or produce manufactured nanomaterials regarding their
    environmental health and safety practices. Survey responses
    indicate that practices addressing these types of protective
    measures are reported less frequently than others.

a. Product stewardship and waste management
          practices
b. Use of administrative controls and personal
          protective equipment
c. Waste management practices and use of
          engineering controls
d. Use of engineering controls and administrative
          controls
10. Some companies reported cleaning practices that government
      regulatory agencies recommend avoiding (i.e., sweeping
      or using a household/shop vacuum or compressed air). True
      or False?
True
False
Developing a New Simplified Method to Determine Diffusive Uptake Rates of Volatile Organic Compounds in Workplaces Based on a Fractional Factorial Designs Approach
Estève Williams, Francine Lhuillier, Christel Ravera, Michel Grzebyck and Eddy Langlois

11. Experiments indicate significant influence on uptake for
      MTBE but not ETBE. True or False?

True
False
12. When the temperature range was reduced to 15–25 °C,
      temperature affected the results less, especially for ETBE.
      True or False?
True
False
Nanoparticle Filtration Performance of Filtering Facepiece Respirators and Canister/Cartridge Filters
Samy Rengasamy, Roland BerryAnn and Jonathan Szalajda

13. Electrostatic filters are expected to show a most penetrating
      particle size of:

a. < 100 nm
b. > 100 nm
14. Two filters with similar efficiency are used for capturing
      nanoparticles. Which filter will be efficient for nanoparticles?
a. An electret filter
b. A mechanical filter

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Deadline for answers is September 30, 2013.

Answers will be available online at
http://www.acgih.org/products/joeh/alanswers.htm
on October 15, 2013.

 
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