By W. H. Walton (Eds.)
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Additional resources for Inhaled Particles V. Proceedings of an International Symposium Organized by the British Occupational Hygiene Society, Cardiff, 8–12 September 1980
Constant 'inspiratory' flows of approx. 15, 30 and 601. m i n - 1 and cyclic 'inspiratory' flows, consisting of approx. 40 successive inspirations per min, with approx. 15,30 or 601. m i n - 1 as the mean flow rate, were drawn through the cast during each test exposure. The exact flow rates obtained during each test are listed in Table 2. The air mover system is shown in Fig. 2. It involved a bypass arrangement to allow air to be drawn simultaneously through the artificial thorax and an alternate air inlet.
The surface density of deposition was mapped on the bifurcation between the trachea and main bronchi. (Fig. 3). This bifurcation section was slit laterally in order to flatten it and then further cut into three sections which were mounted onto microscope slides. Each section was scanned using a Bausch and Lomb Stereo Zoom-7 binocular microscope at 100 x . A grid in the eyepiece allowed delineation of the field into 1 mm 2 areas. The number of particles within each area was optically counted in selected regions, namely, the centre of the carinal ridge, 1 mm on each side of the carina, and every other 1 mm section over the entire bifurcation area.
Envir. 14, 473-480. DISCUSSION C. N. DAVIES: Would you agree with the conclusion that the error due to the sampling efficiency is never going to be outside plus or minus 50%? Dr ARMBRUSTER: Yes, I think this is an assumption we can accept. C. N. DAVIES: Would it not be simpler, therefore, to consider that the existing arrangements for respirable and non-respirable dust suffice and let the effect of head sampling be disregarded as being too fine a degree of refinement for the particular situation?