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Continuing Education — "The Action Level!®"

VOLUME 4(9), September 2007
Journal of Occupational and Environmental Hygiene

Answer the questions below and click "Submit".

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CASE STUDIES:

New Respirator Fit Test Panels Representing the Current U.S. Civilian Workforce
Ziqing Zhuang, Bruce Bradtmiller and Ronald E. Shaffer

1. Anthropometric data from young and fit military personnel
    are representative of diverse civilian workers. True or False?

True
False
2. Respirators designed to fit the new NIOSH respirator fit test
    panels are expected to accommodate what percentage of the
    current U.S. civilian workforce?
a. 80%
b. 90%
c. 95%
d. 100%
On Using Multiple-Jet Nozzles to Suppress Industrial Jet Noise
Shaw-Ching Sheen and Yi-Han Hsiao

3. If two nozzles (with an identical exit velocity, density and
    pressure) display mass flow rates differing by a factor of 10 the
    predicted sound power level of the larger nozzle would be about
    10 dB higher than the smaller nozzle. True or False?

True
False
4. One of the sources of potential hazards posed by the use of
    multiple-jet nozzles is:
a. ultrasound
b. infrasound
Workplace Protection Factors for an N95 Filtering Facepiece Respirator
Larry Janssen, Thomas Nelson and Karen Cuta

5. The presence of particles 8-10 micrometers in size found on
    Ci samples suggests:

a. Respirators are not protective
b. Faceseal leaks are dynamic rather than fixed
          in size
c. A less sensitive analytical method should
          be used for Ci samples
d. Iron is not a good challenge agent for a WPF
          study
6. The authors define adequate Co sample mass for a WPF study
    of a half facepiece respirator as:
a. 20 times the TLV®
b. Challenge concentration does not matter
c. 10 times the TLV®
d. 100 times the mean blank mass of the
          challenge agent
A Population-based Job Exposure Matrix for Power-frequency Magnetic Fields
Joseph Bowman, Jennifer Touchstone and Michael Yost

7. Which of the following statements about the MF JEM (magnetic
    field job exposure matrix) in this paper is false?

a. This MF JEM is representative of exposures in
          the general U.S. working population.
b. This MF JEM can be easily converted into other
          job coding systems like the International Standard
          Classification of Occupations (ISCO).
c. This MF JEM can be used to assign exposure
          when only a job title is available.
d. This MF JEM has a homogeneity of exposure
          within and between occupations comparable to
          JEMs developed for a single industry.
8. Job coding systems like the Standard Occupational Classifications
    (SOC) were developed for assessing workplace exposures
    with JEMs. True or False?
True
False
Particulate and Gaseous Emissions When Welding Aluminum Alloys
Homer Cole, Seymour Epstein and Jon Peace

9. If a production department were planning to weld 3 different
    aluminum alloys, each containing approximately 5% of either
    magnesium, copper or silicon, which would be expected to
    generate the highest concentration of particulate matter during
    the welding process?

a. Magnesium containing alloy
b. Copper containing alloy
c. Silicon containing alloy
10. Which of the following would be expected to generate the
      highest concentration of particulate matter when welding an
      aluminum alloy?
a. GMAW using spray transfer with argon as the
          shield gas
b. GMAW using pulse spray transfer with
          argon/helium as the shield gas
c. GTAW with argon/helium as the shield gas
d. GTAW with argon as the shield gas
Assessment of Noise Exposure for an Indoor and Outdoor Firing Range
William J. Murphy and Randy L. Tubbs

11. Personal Noise Dosimeters accurately measure the exposure
      of persons shooting small caliber weapons. True or False?

True
False
12. Safety glasses worn under the cushion of an earmuff reduced
      the effective peak reduction of the earmuff by about:
a. 17-23 dB
b. 15-19 dB
c. 12-18 dB
d. 5-12 dB


Deadline for answers is September 30, 2007.

Answers will be available online at
http://www.acgih.org/products/joeh/alanswers.htm
on October 12, 2007.

 
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