The usefulness of void-counting for fibre concentration estimation by optical phase contrast microscopy
Sahle, Wubeshet ; Larsson, Gunvor
Annals of Occupational Hygiene
1989
33
1
97-111
comparison ; fibre counts ; filtration sampling ; man-made fibres ; mathematical analysis ; methodology ; scanning electron microscopy
English
Bibliogr.
"The void-counting technique for evaluation of the concentration of airborne respirable fibrous dust by phase contrast optical microscopy is assessed with respect to accuracy, reproducibihty, ease and saving of counting time compared with the conventional method of fibre counting. The method is found to have several advantages over the latter. These are outlined. Based on our own data and those of 10 other Swedish laboratories, it is concluded that more reliable and accurate estimates are obtained in the routine evaluation of airborne fibrous dust concentrations by using the void-counting method, provided the sampling is conducted properly"
Digital
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