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Continuing Education — "The Action Level!^Ž"

VOLUME 1(3), March 2004
Journal of Occupational and Environmental Hygiene

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CASE STUDIES:

Characterization of a Hooded Human Exposure Apparatus for Inhalation of Gases and Aerosols
Patrick T. O'Shaughnessy, John Mehaffy, Janet Watt, Sigurdur Sigurdarson, and Joel N. Kline

1. Experimental methods used to directly expose a human to an
airborne substance as part of a clinical trial have involved all
but which of the following devices:

a. Chambers as large as 60 cubic meters
b. Direct exposure to the face via a mask worn
by the subject
c. Injection of the substance directly into the
subject's trachea
d. A suspended hood placed over the subject's head

2. A pure air powered respirator (PAPR) should maintain a flow
rate of 60 lpm (2 cfm) to ensure that contaminants do not enter
the hood under heavy breathing. True or False?

True
False

Investigation of a Pork Shoulder Deboning Operation
Patrick G. Dempsey and Raymond W. McGorry

3. When assessing exposure to force while cutting meat, it is better
to take more measurements per worker when time is limited.
True or False?

True
False

4. Total exposure to grip force per cycle was correlated higher with:

a. cutting time.
b. force level.

Adaptation and Evaluation of a Personal Electronic Nose for Selective Multi-Vapor Analysis
Meng-Da Hsieh and Edward T. Zellers

5. The instrument described in this article uses what type of detector
to recognize and quantify individual vapors from different functional
groups?

a. Flame ionization detector
b. Array of six tin-oxide semiconductor sensors
c. Array of four polymer-coated surface acoustic
wave sensors
d. Array of two polymer-coated surface acoustic
wave sensors

6. Advantages of the detector technology used in the instrument
described in this article include:

a. small size, simple supporting circuitry,
low-temperature operation
b. sensitivity to many organic vapors
c. adjustable selectivity
d. All of the above
e. a and b above

7. Increasing the temperature of the instrument results in which of
the following changes in performance:

a. decrease in sensitivity but little or no effect on
          vapor recognition
b. decrease in sensitivity and reduced capability for
          vapor recognition
c. increase in sensitivity and increased capability for
          vapor recognition

Modeling of Occupant-Generated CO₂ Dynamics in Naturally Ventilated Classrooms
Karen H. Bartlett, Mark Martinez, and Joel Bert

8. Continuous data logging monitors such as the YES CO₂ monitor
    described in this article are programmed to integrate readings
    over user defined time periods. Sometimes these integration
    periods are defined for convenience (e.g., to be able to hold a
    week's worth of data). In this study, it was discovered that the
    integration period had a relationship to the air infiltration rate.
    What was the maximal difference, or error between the
    instantaneous concentration of CO₂, and the time averaged
    value from the data logger?

a. 30 seconds
b. 2 minutes
c. 5 minutes
d. 15 minutes

9. In this study, the CO₂ level in a classroom without forced air
ventilation generated by 25 students reached a steady
state CO₂ concentration within one hour. True or False?

True
False

Variability in Quartz Exposure in the Construction Industry: Implications for Assessing Exposure-Response Relationships
Evelyn Tjoe Nij, Doris Höhr, Paul Borm, Igor Burstyn, Judith Spierings, Friso Steffens, Mieke Lumens, Ton Spee, and Dick Heederik

10. The statistical analysis showed that the type of material worked
     on explained most of the between worker variance. A grouping
     strategy based on this factor would be favorable. Job title,
     however, is more practical when historic data is also needed to
     establish dose response relations. What grouping strategy
     would give the most valuable information for recommending
     control measures?

a. Grouping by material worked on.
b. Grouping by job title.

11. When analyzing quartz dust by XRD in IH samples from
construction sites, what factor may influence the outcome
of the analysis and should be accounted for?

a. Aluminosilicate
b. Water
c. Gypsum
d. Particle size

Glove Use and the Relative Risk of Acute Hand Injury: A Case-Crossover Study
Gary S. Sorock, David A. Lombardi, David K. Peng, Russ Hauser, Ellen A. Eisen, Robert F. Herrick, and Murray A. Mittleman

12. Data from this paper show that glove use is associated with a
reduced risk of crush or avulsion injuries. True or False?

True
False

13. What percentage of glove wearers in this study said their gloves
contributed to their injury?

a. 3%
b. 8%
c. 10%
d. 15%
e. 25%

Assessment of Electrical Charge on Airborne Microorganisms by a New Bioaerosol Sampling Method
Shu-An Lee, Klaus Willeke, Gediminas Mainelis, Atin Adhikari, Hongxia Wang, Tiina Reponen, and Sergey A. Grinshpun

14. The new electrostatic precipitator described in the paper can
differentiate positively charged airborne bacteria and fungi
from negatively charged ones. True or False?

True
False

15. The experimental data presented in this paper show that in most of
the tested environments, the net charge on the airborne
microorganisms was:

a. positive.
b. negative.

Answers to the March 2004 "The Action Level!^Ž" Questions
will be available online (www.acgih.org/Products/JOEH/)
on May 4, 2004.

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