Long-Term Risk From Actinides in the Environment: Modes of Mobility Page: 2 of 32
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" Abstract for Health Physics Society's 45 h Annual Meeting:
Whicker, R.D.; Ibrahim, S.A.; Whicker, F.W. 2000. Vertical Migration of plutonium
in soils from WIPP and Rocky Flats. Health Physics, Vol. 78, no.6, supplement 3.
Pg. 158. ISSN 0017-9078.
" Research paper:
Vertical Migration of plutonium in soils from the Waste Isolation Pilot Plant and the
Rocky Flats Environmental Technology Site (Whicker, R.D.; Ibrahim, S.A.; Whicker,
F.W.). In preparation for submission. Expected completion date: Dec. 31, 2000.
* Vertical Migration of plutonium in soils from WIPP and Rocky Flats (Whicker, R.D.;
Ibrahim, S.A.; Whicker, F.W.). Presentation given by R.D. Whicker at the American
Radiation Safety Conference and Exposition (Health Physics Society's 45 h Annual
Meeting), Adams Mark Hotel, Denver, CO, June 29, 2000.
* Following concepts previously used by German researchers (Bachhuber, H., et al.,
1981), a non-destructive method was developed for measuring the vertical migration
of soil particles labeled with 134Cs tracer in soil column experiments. The
methodology involved monitoring '34Cs transport from outside the column walls
(external monitoring) with a BGO detector encased in a specially constructed lead
collimator coupled to a multi-channel analyzer. The collimator was positioned
perpendicular to the walls of the columns (in-situ). Supporting the collimator was an
adjustable lab jack that allowed external monitoring at various soil depths.
Unlike the design used by the German researchers, our collimator "window" was a
narrow (3 mm) horizontal slit. This helped reduced the angular scatter of photons
impinging on the detector surface and constrained incoming signals to a more
perpendicular geometry. The result was improved resolution of 34Cs depth profiles
(to within 2 or 3 mm) and greater ability to detect subtle changes in these profiles.
Future studies of this kind could benefit not only from the design of the detection
system, but from prior knowledge of the methodology-related problems encountered
during this study (e.g. adequacy of 34Cs concentration levels, edge effect problems,
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Ibrahim, Shawki. Long-Term Risk From Actinides in the Environment: Modes of Mobility, report, May 24, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc733911/m1/2/: accessed July 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.