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Continuing Education — "The Action Level!®"

VOLUME 4(7), July 2007
Journal of Occupational and Environmental Hygiene

Answer the questions below and click "Submit".

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CASE STUDIES:

Effect of Physical Exertion on the Biological Monitoring of Exposure to Various Solvents Following Exposure by Inhalation in Human Volunteers: 2. n-Hexane
Robert Tardif, Véronique Nadeau, Ginette Truchon and Martin Brochu

1. The results of this study clearly suggest that the absorbed dose
    of n-hexane during a normal working day is strongly influenced by
    the workload intensity. True or False?

True
False
2. Which of the following values (µmol/L) of 2-5 hexanedione
    (end-of-exposure) corresponds to the current BEI®, and were
    observed after exposure at REST and at 50W AERO (TWAI 38W),
    respectively?
a. BEI®: 4.14; REST: 3.50; 50W: 4.25
b. BEI®: 3.50; REST: 4.14; 50W: 4.25
c. BEI®: 3.50; REST: 4.25; 50W: 4.14
d. BEI®: 4.25; REST: 4.14; 50W: 3.50
Comparison of Detection Methods for Aspergillus fumigatus in Environmental Air Samples
H. Kenneth Dillon, D. Keith Boling and J. David Miller

3. In this study, measures of fungi are explored to examine which
    one would best characterize worker exposure in occupational
    circumstances to Aspergillus fumigatus. The emphasis is on
    workers who handle wood chips. However, there are a number
    of other workplaces where A. fumigatus occurs in high
    concentrations, always associated with handling rotting
    organic materials. This fungus can be an occupational hazard for
    sanitation workers and sewage plant workers. True or False?

True
False
4. Which measurements taken relate directly to the disease
    outcome in this context?
a. total spores and Asp f1
b. culturable (viable) A. fumigatus and ergosterol
c. Asp f1 and QPRC
d. viable A. fumigatus and Asp f1
e. QPCR and culturable A. fumigatus
Analysis of Portable Impactor Performance for Enumeration of Viable Bioaerosols
Maosheng Yao and Gediminas Mainelis

5. When bioaerosol samplers are compared, the one with the
    highest sampling flow rate will exhibit the highest overall efficiency.
    True or False?

True
False
6. When sampling with multi-nozzle viable bioaerosol impactors,
    it is not important to correct the observed CFUs for coincidence.
    True or False?
True
False
Using Process Control Concepts to Model Conditions Required for Student-Onset Occupational Injuries
W. Monroe Keyserling and Gordon S. Smith

7. Which of the following is NOT an example of a sudden onset injury?

a. laceration
b. Carpal Tunnel Syndrome
c. contusion
d. electrocution
8. Engineering controls can be used to improve the fault tolerance
    of work systems, thus reducing the likelihood of injury caused by
    equipment failure or human error. True or False?
True
False
Part I — Effects of Cross-Sectional Dimensions on Active Noise Control in Rectangular and Round Ducts
Jeremy Slagley and Steven Guffey

9. The main duct characteristic which determines the cut-on
    frequency for higher order modes in ducts is the:

a. Duct length
b. Duct cross-sectional dimensions
c. Duct material
d. Duct-to-duct connections
10. In study II, round duct diameter was changed to examine effects
     on active noise control maximum insertion loss (ANC ILmax)
     at low and middle frequencies. What was the effect on
     ANC ILmax for increasing duct diameter as interpreted by the
     analysis of variance (ANOVA) p-values?
a. No effect for middle frequencies, no effect for
          low frequencies
b. No effect for middle frequencies, decreasing
          ANC ILmax for low frequencies
c. Decreasing ANC ILmax for middle frequencies,
          no effect for low frequencies
d. Decreasing ANC ILmax with increasing duct
          diameter for both low and middle frequencies
Pesticide Aerosol Characteristics in the Vicinity of an Agricultural Vehicle Cab During Application
D. Bémer, J. Fismes, I. Subra, V. Blachère and J.C. Protois

11. What is the particle size distribution of the measured
      pesticide aerosol?

a. Mass median diameter between 4-15 µm
b. MMD > 100 µm
12. The pesticide aerosol transfer from the sprayer to the cab
      varies according to the type of treatment. Transfers are generally
      greater in orcharding than in cereal crop growing.
      True or False?
True
False
Heavy Equipment Maintenance Exposure Assessment: Using a Time-Activity Model to Estimate Surrogate Values for Replacement of Missing Data
Fred W. Boelter, John W. Spencer and Catherine E. Simmons

13. The PCM-derived equivalent asbestos fiber count is the product
      of total fibers obtained from PCM (NIOSH 7400) multiplied by the
      asbestos fraction as determined from TEM (NIOSH 7402).
      True or False?

True
False
14. Given higher limits of detection associated with short-term
      samples, a short-term sample may not readily yield a precise
      estimate of a long-term exposure. True or False?
True
False


Deadline for answers is July 31, 2007.

Answers will be available online at
http://www.acgih.org/products/joeh/alanswers.htm
on August 13, 2007.

 
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