Industrial Hygiene Report Of Radon Daughters Surveys In Foundries Using Zirconium Sand As A Molding Agent, Report No. IWS-156-04.
NIOSH 1985 Oct:33 pages
A survey of exposures to radon (10043922) daughters in foundries using zirconium sand as a molding agent was conducted. The survey was prompted by a report that significant concentrations of uranium and thorium decay isotopes were found in zirconium sand. Area air and bulk samples were analyzed for radon daughter activity in selected operations of five foundries that used zirconium sand as part of the molding aggregate or as a molding agent. One foundry was located in Ohio, the other four were in California. Maximum radon daughter activity in the area samples ranged from not detectable to 0.023 working level (WL). The OSHA standard for radon daughter activity is 0.33 WL. No results were available for the bulk samples due to difficulties with the analytical procedures. The author concludes that the measured levels of radon daughter activity in the foundries are extremely low. The potential for a radiological health hazard due to exposure from radon daughters in zirconium sand at this time is very low. Laboratory studies of zirconium sand and a gamma radiation survey of foundries that use zirconium sand are recommended.
NIOSH-Author; NIOSH-Survey; Field-Study; Foundry-workers; Exposure-limits; Chemical-analysis; Industrial-environment; Air-monitoring; Exposure-levels; IWS-156-04; Region-5; Region-9;
NTIS Accession No.
Division of Surveillance, Hazard Evaluations and Field Studies, NIOSH, U.S. Department of Health and Human Services, Cincinnati, Ohio, Report No. IWS-156-04, 33 pages, 26 references