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Continuing Education — "The Action Level!®"

VOLUME 1(10), October 2004
Journal of Occupational and Environmental Hygiene

Answer the questions below and click "Submit".

Full Name:
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CASE STUDIES:

Evaluation of Non-uniform 60-hertz Magnetic-field Exposures for Compliance with Guidelines
T. Dan Bracken and Trevor Dawson

1. Guideline limits for power-frequency magnetic field exposure are
    based on uniform field exposures. True or False?

True
False
2. When non-uniform 60-Hz magnetic field exposures are taken into
    account, the magnitude of the magnetic field limit will tend to
    ________ relative to the uniform-field exposure limit.
a. Increase
b. Remain the same
c. Decrease
Number Size Distribution, Mass Concentration, and Particle Composition of PM1, PM2.5 and PM10 in Bag Filling Areas of Carbon Black Production
T.A.J. Kuhlbusch, M. Ewald, H. Hufmann, S. Neumann, and H. Fissan

3. Bagging of carbon black does not release any significant amounts of
    ultrafine particles. True or False?

True
False
4. Other sources of ultrafine particles not directly related to the
    production process are negligible. True or False?
True
False
Industries in the United States with Airborne Beryllium Exposure and Estimates of the Number of Current Workers Potentially Exposed
Paul K. Henneberger, Sandra K. Goe, William E. Miller, Brent Doney and Dennis W. Groce

5. Measurements of airborne beryllium were used to identify private
    industries (other than the primary beryllium industry) that had
    workers who were potentially exposed to beryllium. Beryllium was
    detected exclusively in the manufacturing sector. True or False?

True
False
6. Based on information from the federal government and the primary
    beryllium industry, combined with an estimate of the number of
    workers elsewhere in private industry with exposure greater than
    0.1 µg/m3 beryllium, as many as ________ current workers are
    potentially exposed to beryllium in the United States.
a. 104,000
b. 134,000
c. 164,000
d. 194,000
e. None of the above

A Review of Engineering Control Technology for Exposures Generated During Abrasive Blasting Operations
Michael R. Flynn and Pam Susi

7. Which of the following are alternative abrasives to silica sand that
    studies suggest are less toxic.

a. Specular hematite
b. Dolomite
c. Dry ice
d. All of the above
e. None of the above
8. Vacuum blasting has been demonstrated to reduce lead exposures
    on bridge work. True or False?
True
False
Disabling and Fatal Occupational Claim Rates, Risks and Costs in the Oregon Construction Industry 1990-1997
Irwin B. Horwitz and Brian P. McCall

9. This study found that the majority of construction employees filing
    workers' compensation claims were 35 years or younger.
    True or False?

True
False
10. The leading cause of death of claimants in this study was from
      traffic accidents. True or False?
True
False
Evaluation and Determinants of Airborne Bacterial Concentrations in School Classrooms
Karen H. Bartlett, Susan M. Kennedy, Michael Brauer, Chris van Netten and Barbara Dill

11. This study found that carpeted classrooms had higher
      concentrations of indoor bacteria than non carpeted classrooms.
      True or False?

True
False
12. In this study it was shown that measurement of the actual airflow
      in a ventilation system (e.g., by using a thermal anemometer) was
      equivalent to full day CO2 measurements as a determinant
      of total indoor bacterial concentration. True or False?
True
False


Deadline for answers is October 22, 2004.

Answers will be available online at
http://www.acgih.org/products/joeh/alanswers.htm
on October 29, 2004.

 
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