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Measurement of Helium-3/Helium-4 Ratios in Soil Gas at the 618-11 Burial Ground.

DE2002789917

Publication Date	2001
Personal Author	Olsen, K. B.; Dresel, P. E.; Evans, J. C.
Page Count	28
Abstract	Seventy soil gas-sampling points were installed around the perimeter of the 618-11 Burial Ground, approximately 400 feet downgradient of well 699-13-3A, and in four transects downgradient of the burial ground to a maximum distance of 3,100 feet. Soil gas samples were collected and analyzed for helium-3/helium-4 ratios from these 70 points. Helium-3/helium-4 ratios determined from the soil gas sampling points showed significant enrichments, relative to ambient air helium-3 concentrations. The highest concentrations were located along the northern perimeter of the burial ground. Helium-3/helium-4 ratios (normalized to the abundances in ambient air) ranged from 1.0 to 62 around the burial ground. The helium-3/helium-4 ratios from the 4 transect downgradient of the burial ground ranged from 0.988 to 1.68. The helium-3/helium-4 ratios from around the burial ground suggest there is a vadose zone source of tritium along the north side of the burial ground.
Keywords	Radionuclide migration Helium 3 Soils Underground storage Sampling Tritium Helium 4
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Pacific Northwest National Lab., Richland, WA.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200212
Contract Number	AC06-76RLO1830

Measurement of Helium-3/Helium-4 Ratios in Soil Gas at the 618-11 Burial Ground.

Measurement of Helium-3/Helium-4 Ratios in Soil Gas at the 618-11 Burial Ground.
DE2002789917

Publication Date	2001
Personal Author	Olsen, K. B.; Dresel, P. E.; Evans, J. C.
Page Count	28
Abstract	Seventy soil gas-sampling points were installed around the perimeter of the 618-11 Burial Ground, approximately 400 feet downgradient of well 699-13-3A, and in four transects downgradient of the burial ground to a maximum distance of 3,100 feet. Soil gas samples were collected and analyzed for helium-3/helium-4 ratios from these 70 points. Helium-3/helium-4 ratios determined from the soil gas sampling points showed significant enrichments, relative to ambient air helium-3 concentrations. The highest concentrations were located along the northern perimeter of the burial ground. Helium-3/helium-4 ratios (normalized to the abundances in ambient air) ranged from 1.0 to 62 around the burial ground. The helium-3/helium-4 ratios from the 4 transect downgradient of the burial ground ranged from 0.988 to 1.68. The helium-3/helium-4 ratios from around the burial ground suggest there is a vadose zone source of tritium along the north side of the burial ground.
Keywords	Radionuclide migration Helium 3 Soils Underground storage Sampling Tritium Helium 4
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Pacific Northwest National Lab., Richland, WA.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200212
Contract Number	AC06-76RLO1830