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....http://www.google.com.au/patents/US5482677?utm_source=gb-gplus-sharePatent US5482677 - Thermally desorbable passive dosimeter
