Methylene Chloride Sampling with Passive Dosimeters under Steady-State and Transient Conditions.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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This thesis investigates the application of passive charcoal dosimeters to monitor concentrations of methylene chloride vapors. Monitoring the workplace air for methylene chloride vapors requires the collection of air samples in the workers breathing zone during the work day. The work day exposure usually fluctuates and the air samples must be integrated over periods of several hours or more. This sample integration determines the time-weighted average TWA concentration. TWA exposures assist the industrial hygienist in assessing the healthfulness of the occupational environment and are used for compliance purposes by comparison with established 8-hour time-weighted average standards. This study examined the methylene chloride sampling and retention abilities of passive dosimeters and their subsequent TWA determinations. To evaluate their performance, three commercially available dosimeters were exposed to known concentration profiles of methylene chloride. This comparison was done under laboratory conditions to minimize the differences in actual badge exposure. There are five hypotheses to be tested. Each hypotheses tests the central issue passive dosimetry is an accurate method to sample fluctuating occupational exposures to methylene chloride.
- Hygiene and Sanitation
- Environmental Health and Safety