Many long-term workers in the Westem Australia mineral sands industry have chronically inhaled significant levels of thorium ore dust.
As industry air sampling records are only reliable since 1986, a retrospective assessment to the 1960s has been made of activity inhaled by these workers.
Gravimetric dust sampling data since the mid-1970s are reviewed and inhaled activity derived assuming an estimated dust specific activity.
Pre-1977 intakes are derived by considering site specific monazite production levels, or monazite content of heavy mineral feed, and by reviewing the inspectorate's historical ventilation summaries.
Broad assignments of inhaled activity are made for dry plant operators and other workers at each site.
The retrospective assessment results in some operators being assigned average annual intakes up to 10,000 Bq, which implies annual committed effective doses well in excess of 50 mSv.
These crude estimates are broadly consistent with intakes derived from thorium lung burden measurements.
Mots-clés Pascal : Maladie professionnelle, Exposition professionnelle, Homme, Sable, Travailleur, Produit radioactif, Inhalation, Australie, Long terme, Thorium, Poussière, Epidémiologie, Océanie
Mots-clés Pascal anglais : Occupational disease, Occupational exposure, Human, Sand, Worker, Radioactive product, Inhalation, Australia, Long term, Thorium, Dust, Epidemiology, Oceania
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 95-0412259
Code Inist : 002B30A02A. Création : 01/03/1996.