Follow-up study on the lung retention of welding fumes among shipyard welders

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      <subfield code="a">Lung retention and clearance of welding fumes were followed during the years 1976-1982 among 48 shipyard arc welders. The subjects were divided into four groups according to their average exposure time, which varied from 3 to 49 yr. The amount of lung-retained dust was estimated using magnetopneumography. The results indicate that the average clearance rate was 20% per yr. The individual clearances varied between 10 and 30% per yr. Improvements in hygiene in the shipyard were clearly seen in the changes of lung retention rates</subfield>
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