A completely head-mounted full shift dust sampler for monitoring the lead-in-air concentration in a lead worker's actual breathing zone is described. A small filter head is positioned within 5 cm of the mouth and nose on an adjustable stalk. Air is drawn through a 1.25 cm diameter glass fibre filter at a rate of 0.51/min by a small rotary vane pump.
Initial comparisons with a conventional lapel-mounted UKAEA head powered by a Casella pump show that the average lead-in air concentration in the true breathing zone can be significantly different from that around the lapel.
