A Dose Reconstruction Of Air Emissions From
The Oak Ridge Gaseous Diffusion Plant,
Oak Ridge TN, Using Historic Air Monitoring
And Emission Data
Author(s)
M. W. Evans
Abstract
As part of its mandated public health mission, ATSDR must determine whether
historic air emissions from the Oak Ridge Gaseous Diffusion Plant represented a
public health hazard to adjacent communities. ORGDP produced enriched
uranium via gaseous or thermal diffusion of uranium hexafluoride (UF6; which
undergoes rapid atmospheric transformation into hydrogen fluoride and uranium
oxides). The dose reconstruction was accomplished using established air
dispersion models and site-specific meteorological and historic air monitoring
data to verify the use of both the modelling tools and the emission estimates.
Air concentrations and doses to radionuclides were estimated using the standard
air dispersion models. Meteorological data are from multiple weather years for
two on-site stations. The Department of Energy has been collecting
environmental measurements in soil, air, and water since at least 1953. Two
stations adjacent to ORGDP were sampled for airborne gross alpha particulates
since at least the mid-1960s. With some simplifying assumptions, there is good
agreement between the historic gross alpha concentrations and those predicted
from dispersion modelling. When combined with health-protective exposure
assumptions, the estimated emission data and dispersed air concentrations
provide a reliable basis for the public health determinations at this site.
Keywords: uranium hexafluoride, historic monitoring, dispersion modelling,
dose reconstruction, air emissions.
Keywords
uranium hexafluoride, historic monitoring, dispersion modelling,
dose reconstruction, air emissions.
Related Book
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