Abstract

The analysis of asbestos fibres is well established (see 1 for a description of the preparation and the procedure for detection and fibre characterisation with a transmission microscope). Although the procedure for fibre counting and characterisation is described in detail, the result depends on the accuracy of the time-consuming and tedious sample inspection. A substantial part of operator effort is wasted on scanning the grid in the right way in order to avoid double counting of fibres or missingareas. In this way a subjective factor may contribute to the measurement and can distort the results.In order to make asbestos analysis more reliable, a remote control program has been developed for the motorised goniometers of the Philips CM series microscopes (the CompuStage of the recently introduced Cmxxx series or the Specimen Relocation System of the previous Cmxx series). The program controls the systematic scanning of the grid and documentation of the fibres detected. In this way the operator can concentrate fully on the inspection and characterisation of the fibres.

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