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Continuing Education — "The Action Level!®"

VOLUME 9(1), January 2012
Journal of Occupational and Environmental Hygiene


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CASE STUDIES:

Efficacy of Occupant-Collected Dust Samples in the Evaluation of Residential Allergen and Fungal Levels
M.V. Van Dyke, J.M. Martyny, J. Marola, P. Ramamoorthy, A. Ridder, R.J. Harbeck and C.S. Rose

1. Which of the following statements best expresses appropriate
    utility for single number indices such as the Relative Moldiness
    or Environmental Relative Moldiness Indices for home
    evaluations?

a. the concentration of toxic fungi in the home
b. a relative index of the risk of adverse health
          effects from living in the home
c. a relative index of the mold burden in the home
          compared to a normative database of homes
          compiled by researchers at U.S. EPA and HUD
d. the ratio of indoor to outdoor mold in the home
2. For homes located in arid environments such as Colorado,
    one would expect to find high levels of dust mite allergen in
    settled dust. True or False?
True
False
Variability in Muscle Activity and Wrist Motion Measurements among Workers Performing Non-Cyclic Work
Nathan B. Fethke, Fredric Gerr, Daniel C. Anton, Joseph E. Cavanaugh and Mark T. Quickel

3. Which of the following was assessed using electrogoniometry?

a. activation of wrist flexors
b. activation of trapezius
c. wrist motion
d. static forces at wrist
4. When the magnitude of some variance components appears
    to be zero or even less than zero, the best course of action
    would be:
a. recalculate a minimum of 10 iterations
b. consider the possibility of an ANOVA artifact
c. halve the sample size
d. add duplicates
Discomfort and Exertion Associated with Prolonged Wear of Respiratory Protection in a Healthcare Setting
Brian V. Shenal, Lewis J. Radonovich, Jr., Jing Cheng, Michael Hodgson and Bradley S. Bender

5. Which of the following exertion scales was used?

a. modified Borg
b. Borg
c. MET estimate
d. perceived MET
6. According to the authors, which of the following initiatives
    is most important for the path forward?
a. involving HCWs in design
b. lower cost respirators
c. lighter respirators
d. respirator efficiency calculations
Assessing Potential Nanoparticle Release during Nanocomposite Shredding Using Direct-Reading Instruments
Peter C. Raynor, Jessica Ingraham Cebula, Jeffrey S. Spangenberger, Bernard A. Olson, Jean M. Dasch and James B. D'Arcy

7. As measured by a P-Trak Ultrafine Particle Counter, what
    was the concentration of particles when plain polypropylene
    test plaques were shredded in a granulator relative to the
    concentration when polypropylene test plaques containing
    a nanoclay composite material were shredded?

a. About ˝ as much
b. About the same
c. About 3 times as much
d. About 8 times as much
e. About 20 times as much
8. Select the accurate summary of the findings of the
    measurements made when nanocomposite test plaques
    were shredded in a granulator.
a. No particles were produced.
b. Some particles were produced, but none were
          identified as nanoclay particles.
c. Nanoclay particles were easily released from
          the nanocomposite.
d. Talc is a better filler for polypropylene resins
          than nanoclay.
Flow Characteristics and Spillage Mechanisms of Wall-Mounted and Jet-Isolated Range Hoods Subject to Influence from Cross Draft
Jia-Kun Chen, Rong Fung Huang and Kuan-Lin Peng

9. The flow visualization and SF6 measurements in this study
    reveal the physical mechanism and potential dangers of the
    hood leakages under the influence of cross draft. True or
    False?

True
False
10. There is a critical draft velocity beyond which the spillage
      of pollutants becomes substantially significant. True or
      False?
True
False
Headform and N95 Filtering Facepiece Respirator Interaction: Contact Pressure Simulation and Validation
Zhipeng Lei, Jingzhou (James) Yang and Ziqing Zhuang

11. Respirator fit and comfort depend on the contact pressure
      between a respirator and human face. True or False?

True
False
12. Contact pressure distributions are identical among all workers.
      True or False?
True
False

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Deadline for answers is January 31, 2012.

Answers will be available online at
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on February 8, 2012.

 
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