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One-dimensional model of the movement of trace radioactive solute through soil columns: the PERCOL model

Description: A one-dimensional mathematical model, PERCOL, has been developed to predict the movement of radionuclides through porous media as a function of measurable chemical parameters of the media. Laboratory column studies were conducted to verify the model. System parameters considered include soil type, radionuclide type, waste composition, flow rate, column length, and soil saturation. The agreement between measured radionuclide movement and that predicted by the model is considered good.(auth)
Date: January 1, 1972
Creator: Routson, R.C. & Serne, R.J.
Partner: UNT Libraries Government Documents Department

Ge(Li) low level in-situ gamma-ray spectrometer applications

Description: Currently a Ge(Li) spectrometer is being employed for in-situ measurements of radionuclides contained in soil. This is being done at nuclear reactor sites and in complex radionuclide fields at the Nevada Test Site. The methodology and precision of the in-situ spectrometric technique was previously established for analysis of radionuclides in soil. Application of the technique to gaseous and liquid effluents containing radionuclides has shown a great deal of promise. (auth)
Date: December 27, 1973
Creator: Phelps, P.L.; Anspaugh, L.R.; Roth, S.J.; Huckabay, G.W. & Sawyer, D.L.
Partner: UNT Libraries Government Documents Department

Experimental design for the preliminary study of geochemical processes

Description: An example of the use of a simple fuctorial design to study the distribution of /sup 134/Cs and/sup 85/Sr between a soil column and solution is reported. In this design, two concentration levels of each of four factors (NaNO/ sub 3/, HNO/sub 3/, KNO/sub 3/, and Ca(NO/sub 3//sub 2/) were combined in all possible combiuations to give a total of 24 combinations. In the case of /sup 134/Cs removal, all of the independent variables were significant over their respective concentration ranges, while with the removal of /sup 85/Sr, none of the independent variables was statistically significant. Extending the concentration range of NaNO/sub 3/ caused the NaNO/sub 3/ effect total to become statistically significant at the 5% t-test level in its effects on /sup 85/Sr removal. A fractioral factorial design was used to study the removal of Sr from solutions into an apatite during a chemical reaction between phosphate ion and calcite. The Yates analysis of the Sr removal data is tabulated. It is noted that even at a t-test level of 1%, calcite surface area, influent solution pH. and system temperaturesolution pH interaction are statistically significant. The two-level factorial design yields no direct indication of the Sr removal mechanism but does suggest that a chemical reaction is involved. (JGB)
Date: March 24, 1966
Creator: Ames, L.L. Jr. & Hajek, B.F.
Partner: UNT Libraries Government Documents Department

Proposed interim standard for plutonium in soils

Description: Current standards for controlling health effects from plutonium in the body are discussed. Available information on possible sources of exposure of people living in an area where the soils are contaminated with plutonium is analyzed to arrive at estimates of intake. From these estimates, a recommended interim standard for the upper limit of concentration of plutonium in the soils in inhabited areas is derived. The recommendation is based upon conservative assumptions where information is lacking and further studies should result in revision. The subjects of resuspension, deposition velocity of particles, and effectiveness of radioactive particulates in producing lung cancer are discussed in appendices. (auth)
Date: January 1, 1974
Creator: Healy, J.W.
Partner: UNT Libraries Government Documents Department

PERCOL user's manual

Description: For Atlantic Richfield Hanford Co., Richland, Wash. Research being conducted under the Radionuclides in Soils Program is attempting to predict the distribution and movement of liquid wastes in the heterogeneous subsurface environment of the Hanford Reservation. As part of this program, a transport model is being developed to predict chemical phenomena in soil-waste reactions. This document describes the use of the PERCOL model, which was developed as a simplified one-dimensional precursor to the transport model. PERCOL numerically describes the complex chemical reactions which occur during percolation of a waste solution through a porous media. This User's Manual describes the main program (PERCOL) and two subroutines MEWTIT and DIST) and gives procedures for accessing these programs, inputting data to them and interpreting the output. (auth)
Date: January 1, 1973
Creator: Serne, R.J. & Routson, R.C.
Partner: UNT Libraries Government Documents Department

Transmissivity Iterative Program user's manual

Description: This user' s manual contains listings and functional definitions of the various directives available in the Iterative Sequence. These directives are used to operate the Iterative Sequence and to direct and complete the actual analysis. A complete and thorough description of each directive is contained in the report, The Transmissivity Iterative Programs on the PDP-9: A Man-Machine Interactive System,'' BNWL-1707. (auth)
Date: January 1, 1972
Creator: Addison, L.E.; Friedrichs, D.R. & Kipp, K.L.
Partner: UNT Libraries Government Documents Department