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Continuing Education — "The Action Level!®"

VOLUME 5(5), May 2008
Journal of Occupational and Environmental Hygiene

Answer the questions below and click "Submit".

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CASE STUDIES:

Particle Size Distribution and Particle Size-Related Crystalline Silica Content in Granite Quarry Dust
Greg Sirianni, Howard Dean Hosgood, III, Martin D. Slade and Jonathan Borak

1. Crystalline silica content from bulk analysis can be used to
    represent the percentage of crystalline silica content for
    respirable samples. True or False?

True
False
2. Silica content of respirable dust has similar percentages even
    when the dust is generated by different grinding tools. True
    or False?
True
False
What Does Respirator Certification Tell Us About Filtration of Ultrafine Particles?
Robert Eninger, Takeshi Honda, Tiina Reponen, Roy McKay and Sergey A. Grinshpun

3. The NaCl challenge aerosol used by NIOSH for respirator filter
    certification does not possess a significant fraction in the
    ultrafine size range. True or False?

True
False
4. Under conditions employed by the NIOSH respirator filter
    certification test, which of the following values approximates
    the most penetrating particle size for electrets filters?
a. 0.3 um
b. between 0.1 and 0.3 um
c. < 0.1 um
d. 1 um
Exposure to Wood Dust, Resin Acids and Volatile Organic Compounds during Production of Wood Pellets
Katja Hagström, Sara Axelsson, Helena Arvidsson, Ing-Liss Bryngelsson, Cecilia Lundholm and Kåre Eriksson

5. Which resin acid was newly identified in the wood industry
    during this study?

a. 7 oxodehydroabietic acid
b. Dehydroabietic acid
c. Abietic acid
d. Pimaric acid
6. Nitrogen dioxide can be considered a good marker for exposure
    to diesel exhaust during production of wood pellet. True or False?
True
False
Unmanned Assessment of Respirator Carbon Dioxide Levels: Comparison of Methods of Measurement
David Caretti and Karen Coyne

7. Select the best interpretation regarding breathing CO2
    at a detectable concentration well below that considered
    immediately dangerous to life and health.

a. No effects are noted
b. Can produce headache, anxiety and
          metabolic/ventilatory compensation
c. Not previously described
d. Immediately fatal
8. In terms of a conclusion that can be reached in comparing
      the European and U.S. unmanned respirator test data, select
      the best choice.
a. Although differences exist, data can be used
          interchangeably.
b. Data should not be interchanged.
c. No conclusion can be reached.
d. Differences are small; U.S. values are
          more indeterminate.
Worker Exposure to Methanol Vapors during Cleaning of Semiconductor Wafers in a Manufacturing Setting
Shannon Gaffney, Emily Moody, Meg McKinley, Jeffrey Knutsen, Amy Madl and Dennis Paustenbach

9. The tracer gas used in this study is sulfur hexafluoride (SF6).
      True or False?

True
False
10. What were the most important parameters thought to drive the
      increased methanol concentrations observed on the second day
      of the study?
a. temperature
b. quantity of methanol used
c. the use of compressed air as a drying technique
d. ventilation rate
e. a and b
f. b and d



Deadline for answers is May 31, 2008.

Answers will be available online at
http://www.acgih.org/products/joeh/alanswers.htm
on June 13, 2008.

 
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