title: Improvements in modeling sagebrush concentrations of radioiodine released from the Hanford site.
abstract: The Hanford Environmental Dose Reconstruction Project estimated the radiation dose to individuals from historical emissions of radioactive materials from the Hanford Site in Washington State. Project validation studies using predicted activity concentrations of 131I on sagebrush (Artemisia tridentata) showed a systematic underestimation against historical data during cold weather months, indicating a need for sagebrush model improvement. A deposition model for semi-volatile organic materials presented by Komp and McLachlen (Environ. Sci. Tech. 31 (1997) 886-890) is adapted here for gaseous iodine onto sagebrush. The deposition model includes a temperature-dependent term based on an integrated van't Hoff equation. Calibration data for the model are obtained from a release of 131I in 1963. Modeling results for releases in 1946 show a good match between historical data and predicted results using the new model. The new model shows improvement over interception-fraction type models, but requires plant-type-specific calibration data.
authors.affiliation: Battelle Memorial Institute, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA 99352, USA. bruce.napier@pnl.gov
authors.forename: B A
authors.initials: BA
authors.lastname: Napier
authors.forename: P W
authors.initials: PW
authors.lastname: Eslinger
authors.forename: W E
authors.initials: WE
authors.lastname: Nichols
authors.forename: L
authors.initials: L
authors.lastname: Anderlini
mesh_terms: D000398:Air Pollution, Radioactive / Q000032:analysis*; D019306:Artemisia; D004781:Environmental Exposure; D004784:Environmental Monitoring; D006801:Humans; D007457:Iodine Radioisotopes / Q000493:pharmacokinetics*; D008962:Models, Theoretical; D010946:Plants, Medicinal; D011634:Public Health; D012621:Seasons; D013696:Temperature
chemical_list: D007457:Iodine Radioisotopes