A Proposal for Harmonising Laboratory Performance Assessment Criteria in National Asbestos Fibre Counting Schemes

摘要

Four European national asbestos fibre counting proficiency testing schemes have been studied in order to compare their criteria for the assessment of laboratory performance. Performance assessment is based on each laboratory's results after counting a certain number of samples. Two methods are currently being applied. To be classified 'satisfactory' laboratories must Obtain at least 75% of normalised counts lying within defined performance limits (in three Schemes), or the median and coefficient of variation of normalised counts must be within Performance limits(in the fourth scheme).