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Continuing Education — "The Action Level!®"

VOLUME 4(3), March 2007
Journal of Occupational and Environmental Hygiene

Answer the questions below and click "Submit".

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CASE STUDIES:

Numerical Investigation and Recommendations for Push-Pull Ventilation Systems
Ming-Jyh Chern and Chen-Hsuan Ma

1. There are four modes in flow fields of a push-pull ventilation system.
    Which one is the optimal mode for operating a push pull ventilation
    system?

a. dispersion mode
b. transition mode
c. encapsulation mode
d. strong suction mode.
2. It is necessary to install a flange at the pull side of a push-pull
    ventilation system. True or False?
True
False
Evaluation of a Standardized Micro-Vacuum Sampling Method for Collection of Surface Dust
Kevin Ashley, Gregory T. Applegate, Tamara J. Wise, Joseph E. Fernback and Michael J. Goldcamp

3. Surface sample collection techniques include the following:

a. Wipe sampling
b. Vacuum sampling
c. Tape sampling
d. Collection of rinsates
e. All of the above
4. Co-collection of substrate material by using vacuum sampling can
    __________ bias gravimetric measurement results.
a. negatively
b. positively
Development of an Empirical Model to Aid in Designing Airborne Infection Isolation Rooms
Charles S. Hayden, II, G. Scott Earnest and Paul A. Jensen

5. For a given flow differential, a decreasing pressure differential implies
    that leakage area into the room is:

a. increasing
b. decreasing
6. The current CDC Guidelines recommend a minimum pressure
    differential of 0.01 "H2O" to maintain proper directional control of
    airflow into an airborne infection isolation room (AIIR). True or False?
True
False
Size Distribution of Airborne Mist and Endotoxin-containing Particles in Metalworking Fluid Environments
Hongxia Wang, Tiina Reponen, Shu-An Lee, Eugene White and Sergey A. Grinshpun

7. In a workplace, the metalworking fluids can be considerably
    contaminated with microorganisms even though the total mist
    level is below the NIOSH REL for metalworking mist (0.5 mg/m3).
    True or False?

True
False
8. Metalworking mists and endotoxin in the fine particle size range
    (<1.0 um) are more of a health concern than larger particles
    because:
a. They penetrate deeper in the respiratory system
b. They settle down quickly due to gravitation causing surface contamination
c. They stay longer in the air
d. a and c
e. a and b
Statistical Issues with Respect to Workplace Protection Factors for Respirators
Kenny S. Crump

9. The Occupational Safety and Health Administration (OSHA)
    proposed an assigned protection factor (APF) to negative
    pressure half facepiece air purifying respirators (HFAPR) of:

a. 5
b. 10
c. 20
d. 100
e. none of these
10. Which of the following criteria would be more stringent?
      Requiring that:
a. the 5th percentile of workplace protection factors
          be larger than the APF
b. the 5th percentile of the 5th percentile of individual
          worker workplace protection factor distributions
          be larger than the APF
c. the 95th percentile of workplace protection factors
          be larger than the APF
d. the 95th percentile of the 95th percentile of
          individual worker workplace protection factor
          distributions be larger than the APF
Analysis of Perfluorocarboxylic Acids in Air
James Miller, John Flaherty, Roice Wille, Warren Buck, Francesco Morandi and Tsuguhide Isemura

11. Which of the following is not a component of the NIOSH method
      validation?

a. specificity
b. sample and standard stability
c. XAD resin purity
d. recovery and breakthrough
e. linearity
12. Poorest recoveries of analytes were obtained at which of
      the following conditions?
a. ambient
b. cool/humid
c. warm/humid
d. cool/dry
e. warm/dry


Deadline for answers is March 31, 2007.

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

 
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