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Passive dosimetry using detector tubes

R H Hill, D A Fraser

    American Industrial Hygiene Association Journal
    |October 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Detector tubes with a 0.5 cm orifice are feasible passive dosimeters for toluene. Shorter orifices and no glass wool plugs improve measurement reliability for accurate toluene vapor concentration detection.

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    Area of Science:

    • Environmental Science
    • Analytical Chemistry
    • Occupational Health

    Background:

    • Accurate monitoring of toluene vapor concentrations is crucial for occupational safety and environmental protection.
    • Traditional methods for detecting toluene can be complex or require specialized equipment.
    • Passive dosimeters offer a simpler approach to personal exposure monitoring.

    Purpose of the Study:

    • To evaluate the feasibility of using detector tubes with a 0.5 cm orifice as passive dosimeters for toluene.
    • To assess the impact of orifice length and glass wool plugs on the reliability of toluene concentration measurements.
    • To compare experimental calibration charts with theoretical models based on diffusion theory.

    Main Methods:

    • Detector tubes with a 0.5 cm orifice were exposed to known toluene vapor concentrations.

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  • The time required to reach a specific stain length on the indicator material was measured.
  • Calibration charts were developed, and the effects of varying orifice length and diffusion through glass wool were tested.

    • Main Results:

    • Detector tubes with a 0.5 cm orifice demonstrated feasibility as passive dosimeters for toluene.
    • Shorter orifice lengths and the absence of a glass wool plug led to more reliable concentration measurements.
    • Theoretical calibration charts based on diffusion theory underestimated the time required for stain development compared to experimental data.

    Conclusions:

    • Detector tubes with a 0.5 cm orifice are a highly feasible option for passive toluene dosimetry.
    • Optimizing tube design by minimizing orifice length and omitting glass wool plugs enhances measurement accuracy.
    • Experimental validation is essential, as diffusion theory alone may not fully capture the observed staining dynamics.