Justification For Soil Sampling For Iodine-129
Associated With The Release Of Iodine-131 From
The Oak Ridge National Laboratory
Author(s)
P. Charp & J. Hanley
Abstract
We will discuss the evaluation of air monitoring data and deer thyroid data
related to radioactive iodine releases from the Oak Ridge National Laboratory
(ORNL). The radioactive iodines, estimated at 1.55 petaBecquerels (42,000
Curies) were released during chemical processing of nuclear reactor fuel rods
during a procedure called RaLa. The RaLa process was designed to isolate and
concentrate radioactive lanthanium used for early nuclear weapon design. The
monitoring data were derived from air sampling locations in and around ORNL
collected in the 1950s. Our evaluation suggests that atmospheric dispersion of
Iodine-131 did not extend beyond ORNL site boundaries; thereby limiting
human exposures. The dose reconstruction effort by the state of Tennessee that
shows radioiodine-related thyroid doses over a 37 kilometer radius. The dose
reconstruction effort was predominated by modeling efforts and includes many
associated uncertainties. Among these included scrubber efficiencies, chemical
forms of the iodine released, air dispersion models, and fate and transport of the
iodines. Moreover, these uncertainties contribute to a typical thyroid dose 95%
confidence interval covering 2 orders of magnitude. Because of these
uncertainties and its potential impact on public health, the Agency for Toxic
Substances and Disease Registry (ATSDR) believes that environmental soil
sampling could help better identify the impacted area. In support of the soil
sampling, we will discuss how the current but unknown Iodine-129
concentrations in soils can be used as a long-term retroactive surrogate for the
dispersion of iodine.
Keywords: soil sampling, Iodine-131, Iodine-129, air modelling, thyroid.
Keywords
soil sampling, Iodine-131, Iodine-129, air modelling, thyroid.
Related Book
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