Lead shielding in hot labs and bunkers: There is exposure

Researchers use radiological materials and are typically aware of the associated radiation hazards. Most researchers and EH&S departments regularly survey and wipe test to characterize and control radiological contamination. However, most researchers may not realize that there is significant measurable lead residue as a result of using and storing lead shielding. Lead is highly regulated as a carcinogen and reproductive hazard by EPA and OSHA. This article presents sampling data collected over several years at The Scripps Research Institute (TSRI) in radiological bunkers and buildings. Lead shielding was stored in these spaces as well as in hot labs where lead shielding was used. Due to the results from an initial survey, a procedure was developed to require lead wipe tests and decontamination of radiological spaces to acceptable levels. Employee exposure sampling was also conducted to determine the nature and extent of exposure to lead during handling and disposal tasks. Subsequent surveys continue to confirm that lead needs to be considered a potential hazard and evaluated.