performed in occupational exposure numerous such as cumulative points of the exposure level <25 workshops: fibre/mL-year, Membrane especially in the Filter Method absence of other since 1973: asbestosis-related phase-contrast alterations. light microscopy counts of fibres performed by an accredited laboratory between 1960–1974, samples were collected on Soluble Filters by an Martin (ARM) type of apparatus, and the light microscopy fibre counts Measurements were performed by a specialised independent laboratory as no
performed in numerous points of the workshops: Membrane Filter Method since 1973: phase-contrast light microscopy counts of fibres performed by an accredited laboratory between 1960–1974, samples were collected on Soluble Filters by an (ARM) type of apparatus, and the light microscopy fibre counts Measurements were performed by a specialised independent laboratory as no occupational exposure such as cumulative exposure level <25 fibre/mL-year, especially in the absence of other asbestosis-related alterations. Martin