The Counting of small numbers of asbestos fibres on membrane filters : a comparison of results from some commercial laboratories

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      <subfield code="a">The Counting of small numbers of asbestos fibres on membrane filters</subfield>
      <subfield code="b">: a comparison of results from some commercial laboratories</subfield>
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      <subfield code="a">From time to time we are asked to measure concentrations of airborne asbestos fibres and we do this by carrying out appropriate air-sampling and then sending the filters to a commercial laboratory for a fibre count. It has compared the results reported by several commercial laboratories in respect of similar air samples taken in our own laboratory/office area at County Hall</subfield>
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