Risk-Based Radionuclide Derived Concentration Guideline Levels for an Industrial Worker Exposed to Concrete-Slab End States at the Savannah River Site

摘要

Dose and risk assessments are an integral part of decommissioning activities. Most human health risk assessments are performed for a reasonable maximum exposure to an individual with assumed intake and exposure parameters that depend on the end state of the decommissioning activities and the likely future use of the site. Regardless of how the potentially exposed individual is defined, the subsequent calculated human health risk is not a measurable quantity. To demonstrate compliance with risk-based acceptance or cleanliness criteria, facility-specific risk assessments usually are performed after final-verification sampling and analysis. Alternatively, conservative, a priori, guideline concentrations for residual contaminants can be calculated and rapidly compared to the subsequently measured contaminant concentrations torndemonstrate compliance.rnIn response to the request for accelerated cleanup at U.S. Department of Energy facilities, the Savannah River Site (SRS) isrndecommissioning its excess facilities through removal of the facility structures leaving only the concrete-slab foundations inrnplace. Site-specific, risk-based derived concentration guideline levels (DCGLs)for radionuclides have been determined for arnfuture industrial worker potentially exposed to residual contamination on these concrete slabs. When appropriate, thesernconservative DCGLs will be used at SRS in lieu of facility-specific risk assessments to further accelerate therndecommissioning process.rnThis paper discusses and describes the methods and scenario-specific parameters used to estimate the risk-based DCGLs forrnthe SRS decommissioning end state.