HR: 0800h
AN: H31D-0434    [Abstracts]
TI: Xenon Isotope Releases from Buried Transuranic Waste
AU: * Dresel, P E
EM: evan.dresel@pnl.gov
AF: Pacific Northwest National Laboratory, MS: K6-96 PO Box 999, Richland, WA 99352 United States
AU: Waichler, S R
EM: scott.waichler@pnl.gov
AF: Pacific Northwest National Laboratory, MS: K9-36 PO Box 999, Richland, WA 99352 United States
AU: Kennedy, B M
EM: bmkennedy@lbl.gov
AF: Lawrence Berkeley National Laboratory, MS 70A-4418 Lawrence Berkeley National Laboratory , Berkeley, CA 94720-8179 United States
AU: Hayes, J C
EM: jc.hayes@pnl.gov
AF: Pacific Northwest National Laboratory, MS: P8-01 PO Box 999, Richland, WA 99352 United States
AU: McIntyre, J I
EM: Justin.McIntyre@pnl.gov
AF: Pacific Northwest National Laboratory, MS: P8-01 PO Box 999, Richland, WA 99352 United States
AU: Giles, J R
EM: GILEJR@inel.gov
AF: Idaho National Laboratory, P.O. Box 1625, MS 3940, Idaho Falls, ID 83415-3940 United States
AU: Sondrup, A J
EM: AJS@inel.gov
AF: Idaho National Engineering and Environmental Laboratory, P.O. Box 1625, Idaho Falls, ID 83415-2107 United States
AB: Xenon is an inert rare gas produced as a fission product in nuclear reactors and through spontaneous fission of some transuranic isotopes. Thus, xenon will be released from buried transuranic waste. Two complementary methods are used to measure xenon isotopes: radiometric analysis for short-lived radioxenon isotopes and mass spectrometry for detection of stable xenon isotopes. Initial measurements near disposal facilities at the U.S. Department of Energy's Hanford Site show radioxenon and stable xenon isotopic signatures that are indicative of transuranic waste. Radioxenon analysis has greater sensitivity due to the lower background concentrations and indicates spontaneous fission due to the short half life of the isotopes. Stable isotope ratios may be used to distinguish irradiated fuel sources from pure spontaneous fission sources and are not as dependent on rapid release from the waste form. The release rate is dependent on the type of waste and container integrity and is the greatest unknown in application of this technique. Numerical multi-phase transport modeling of burial grounds at the Idaho National Engineering and Environmental Laboratory indicates that, under generalized conditions, the radioxenon isotopes will diffuse away from the waste and be found in the soil cap and adjacent to the burial ground at levels many orders of magnitude above the detection limit.
DE: 1803 Anthropogenic effects
DE: 1875 Unsaturated zone
DE: 1040 Isotopic composition/chemistry
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting