Measured 129I concentration profiles in southeastern United States soil are examined by means of a six-compartment model to estimate accumulation and downward migration in undisturbed surface soil. Effective mean residence half-times in the top 30-cm-depth interval averaged 30 +/- 6 y, based on estimated annual 129I deposition rates in the vicinity of a chemical separations facility for nuclear material over a 25-y period. The model demonstrates the need for subdividing the soil into small depth intervals of 5 cm or less near the surface. The results of this study differ significantly with other surface soil residence time studies where a large single depth interval was assumed. The conclusions do, however, compare favorably with distribution coefficient studies in the surface hydrosphere. Application of the results are graphically demonstrated.

Prepared fearthe U. S. Department of F.nerRyunder contract Iqo. DE-AC09-B9SR18035 DI,STRIBUTION OF THIS DOCUMENT IS UNLIMITED pip imeul_oe_lly left blank. TOC-4 mIJ_,n Concentrations and Dosesin Air 5-22 Concentrations in Groundwater 5-22 Concentrations and Dosesin OffsiteSurfaceand PotableWaters 5-22 Summary of Dosime_ic Impac'ts 5-..24 References for Chapter 5 5-25 Appendix A-Physical, Chemical and Biological Properties of Iodine A-1 Ph_ical Properties A-1 Chemicaland Biological Properties A-1 Propertiesin NuclearReactorAccidents A-2 References for AppendixA A-3 Appendix B-Environmental Samp;ing and Analysis B-1 RoutineSiteOperatingConditions B-1 Air B-1 Rain B-1 Milk S-2 Groundwater B-2 SurfaceWater B-2 F._uent Outfdb I_rom I'rocm Arm B-3 SiteSm_m Ssvsnn_ Rivet' Other Environmental Media B-3 Emergency Response Conditions B-3 WeatherInforrnalJon andDisplaySystem B-3 RadiolosJcal Assistance ProsramLabcwatory B-3 Trackin8Radioactive Atmospheric Contaminants Laboratc_ B-4 FieldSampleCollectionTeams 8-4 Bibliography i mmi_n TOC-5 pap intentionallyleft blank.

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