Measurement of Tritium in Gas Phase Soil Moisture and Helium-3 in Soil Gas at the Hanford Townsite and 100 K Area Metadata

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  • Main Title Measurement of Tritium in Gas Phase Soil Moisture and Helium-3 in Soil Gas at the Hanford Townsite and 100 K Area


  • Author: Olsen, KB
    Creator Type: Personal
  • Author: Patton, GW
    Creator Type: Personal
  • Author: Poreda, R
    Creator Type: Personal
  • Author: Dresel, PE
    Creator Type: Personal
  • Author: Evans, JC
    Creator Type: Personal


  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: US Department of Energy (United States)


  • Name: Pacific Northwest National Laboratory (U.S.)
    Place of Publication: Richland, Washington
    Additional Info: Pacific Northwest National Lab., Richland, WA (United States)


  • Creation: 2000-07-05


  • English


  • Content Description: In 1999, soil gas samples for helium-3 measurements were collected at two locations on the Hanford Site. Eight soil gas sampling points ranging in depth from 1.5 to 9.8 m (4.9 to 32 ft) below ground surface (bgs) in two clusters were installed adjacent to well 699-41-1, south of the Hanford Townsite. Fifteen soil gas sampling points, ranging in depth from 2.1 to 3.2 m (7 to 10.4 ft) bgs, were installed to the north and east of the 100 KE Reactor. Gas phase soil moisture samples were collected using silica gel traps from all eight sampling locations adjacent to well 699-41-1 and eight locations at the 100 K Area. No detectable tritium (<240 pCi/L) was found in the soil moisture samples from either the Hanford Townsite or 100 K Area sampling points. This suggests that tritiated moisture from groundwater is not migrating upward to the sampling points and there are no large vadose zone sources of tritium at either location. Helium-3 analyses of the soil gas samples showed significant enrichments relative to ambient air helium-3 concentrations with a depth dependence consistent with a groundwater source from decay of tritium. Helium-3/helium-4 ratios (normalized to the abundances in ambient air) at the Hanford Townsite ranged from 1.012 at 1.5 m (5 ft) bgs to 2.157 at 9.8 m (32 ft) bgs. Helium-3/helium-4 ratios at the 100 K Area ranged from 0.972 to 1.131. Based on results from the 100 K Area, the authors believe that a major tritium plume does not lie within that study area. The data also suggest there may be a tritium groundwater plume or a source of helium-3 to the southeast of the study area. They recommend that the study be continued by placing additional soil gas sampling points along the perimeter road to the west and to the south of the initial study area.
  • Physical Description: 24 p.


  • Keyword: Installation
  • Keyword: Tritium
  • Keyword: Ground Water
  • Keyword: Samplers
  • Keyword: Radioecological Concentration
  • Keyword: Sampling
  • Keyword: Helium 3
  • STI Subject Categories: 11 Nuclear Fuel Cycle And Fuel Materials
  • Keyword: Soils
  • Keyword: Moisture
  • Keyword: Plumes
  • Keyword: Hanford Reservation


  • Other Information: PBD: 5 Jul 2000


  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI


  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report


  • Text


  • Report No.: PNNL-13217
  • Report No.: EW02J1080
  • Grant Number: AC06-76RL01830
  • DOI: 10.2172/757601
  • Office of Scientific & Technical Information Report Number: 757601
  • Archival Resource Key: ark:/67531/metadc702246


  • Display Note: INIS; OSTI as DE00757601
  • Display Note: Medium: P; Size: 24 pages