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Continuing Education — "The Action Level!®"

VOLUME 7(11), November 2010
Journal of Occupational and Environmental Hygiene


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CASE STUDIES:

Hexavalent Chromium Exposure and Control in Welding Tasks
John D. Meeker, Pam Susi and Michael R. Flynn

1. Which of the following was NOT found to influence hexavalent
    chromium concentrations in the study?

a. Local exhaust ventilation
b. Base metal
c. Sample analysis method
d. Welding process
2. According to this paper, what is the "proposed" NIOSH
    Recommended Exposure Limit (REL) for hexavalent
    chromium?
a. 0.05 µg/m3
b. 0.2 µg/m3
c. 1.0 µg/m3
d. 5.0 µg/m3
Fit Testing Respirators for Public Health Medical Emergencies
Lisa M. Brosseau

3. How did the average fit factor for respirators examined in
    this study compare to an earlier study of surgical masks
    when no donning assistance was provided?

a. The respirators had higher fit factors than
          the surgical masks.
b. The surgical masks had higher fit factors than
          the respirator.
c. The fit factors were similar.
d. The surgical masks had better filter efficiency
          than the respirators.
4. The assigned protection factor for negative pressure half
    facepiece respirators worn in industrial settings by trained,
    fit tested users is 10 – which means that 95% of users should
    obtain this level of fit when wearing the respirator. Using the
    information in Table III, what "assigned protection factor" would
    be appropriate for Respirator A when it is worn by naive,
    untrained users during a public health medical emergency?
a. 2
b. 5
c. 10
d. 100
Effect of Particle Size on Respiratory Protection Provided by Two Types of N95 Respirators Used in Agricultural Settings
Kyungmin Jacob Cho, Susan Jones, Gordon Jones, Roy McKay, Sergey A. Grinshpun, Alok Dwivedi, Rakesh Shukla, Umesh Singh and Tiina Reponen

5. How did the particle size affect the workplace protection
    factor (WPF)?

a. WPF increased with increase in particle size.
b. WPF decreased with increase in particle size.
c. WPF remained constant when particle size
          increased.
6. The WPF was lower for females than for males. True or False?
True
False
Hand Surface Area Estimation Formula Using 3D Anthropometry
Yao-Wen Hsu and Chi-Yuang Yu

7. There are two ways to obtain hand surface area (HSA). The
    first approach applies a percentage of the body surface area
    (BSA). The second approach is:

a. To perform an estimate by guess
b. To perform an estimate using a formula
c. It is a constant value.
8. The hand surface area (HSA) is estimated in this study using:
a. the paraffin wrapping method
b. a 3D hand scanner
c. the tracing method
Noise Exposure, Characterization, and Comparison of Three Football Stadiums
Derek J. Engard, Delvin R. Sandfort, Robert W. Gotshall and William J. Brazile

9. The loudest section in most college football stadia matches
    which of the following:

a. student section
b. cheerleader bench
c. team bench
d. alumni box area
10. Which of the following recommendations regarding a
      hearing conservation program (HCP) is most accurate?
a. Many workers should be enrolled in an HCP.
b. All workers belong in the HCP.
c. Only line workers belong in the HCP.
d. An HCP would be inappropriate for any workers.
A Simplified Building Airflow Model for Agent Concentration Prediction
David R. Jacques and David A. Smith

11. The model described best accommodates:

a. weather-driven effects
b. temperature-driven effects
c. concentrations for average daily conditions
d. humidity-driven effects
12. An advantage of a computational fluid dynamic (CFD)
      approach over multi-zone modeling (MZM) does not include:
a. the lower expense when using CFD
b. MZM describes individually well-mixed spaces
c. MZM solves for flow rates in order to predict
          concentrations

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Deadline for answers is November 30, 2010.

Answers will be available online at
http://www.acgih.org/products/joeh/alanswers.htm
on December 9, 2010.

 
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