Strontium Sorption onto SRP Soils Page: 3 of 28
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point, since strontium is only weakly complexes by most organic
To verify satisfactory containment performance of the SRP
low-level radioactive waste burial site, the migration of radionu-
clides from the waste has been monitored since 3 years after the
site's inception. An understanding of the migration process and
the potential concerns associated with it is being obtained f om
lysimeter and laboratory studies and from transport modeling.
The laboratory studies provide much useful information.2
The distribution coefficients obtained from these studies can be
used in transport models such as the Dose-to-Man code to predict
dosesto individuals and to populations based on various scena-
rios.3 The sorption data can be compared with results obtained
from the lysimeters and monitoring to establish the validity of the
laboratory data. The flexibility available in the laboratory
allows one to cover the conditions expected or known in the burial
ground. Finally, laboratory studies provide a means to understand
the fundamental chemical process of the soil/waste/water system of
the SRP burial ground. And to a limited extent, generic technology
on the migration of radionuclides from an operating shallow land
burial site in a humid region may be developed.
The radionuclides Sr-90, Tc-99, Cs-137, 1-129, Pu-238,
Pu-239, Ru-106, and Sb-125 are considered important because of
their expected mobility, long lifetime, and/or toxicity.4 The
nuclide of interest in this report, strontium-90, has a half-life
of 28.1 years, and has a slight potential for migration. The
estimated inventory of strontium-90 in the burial ground is about
11,000 Ci.A If ingested by man, strontium substitutes for
calcium in bone tissues making toxicity also an important
A large amount of laboratory research using SRP soil and
groundwater is reported for strontium-90.7'8,9 Ryan found
that strontium and cesium sorption were strongly influenced by
trench waters, i.e., perched waters that occur in the waste
trenches.9 Kd's significantly above and below that obtained
for a typical groundwater were observed. A study was conducted by
fblath to determine what effect each of the cations present at
elevated levels in the trench water have on the cesium Kd.10
A similar study for strontium is the main thrust of this work.
Previous SRP strontium work is summarized first. Data from well
and trench water monitoring, lysimeters, and laboratory studies are
included. The second section, on current work, addresses the
G. T. WRIGHT
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Hoeffner, S.L. Strontium Sorption onto SRP Soils, report, July 2, 2001; South Carolina. (digital.library.unt.edu/ark:/67531/metadc724140/m1/3/: accessed July 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.