Thermally desorbable passive dosimeter

摘要

A passive dosimeter with a structurally reinforced sorbent wafer is used for monitoring a worker's exposure to ambient aromatics (benzene, toluene, ethylbenzene and xylenes). The wafer is preferably formed by pressing 4 mg of sorbent material between two pieces of 100 mesh stainless steel wire gauze. The thickness of the formed pellet is about 1 mm. The wafer sorbent material design produces a much smaller background noise on gas chromatographic (GC) analysis and enhances the signal-to-noise ratio during the thermal desorption process. This enables the detection of a much lower concentration level of ambient air contaminants than other types of passive dosimeters designed for thermal desorption analysis.