Basalt-radionuclide distribution coefficient determinations. FY-1979 annual report
Description
Experimental radionuclide distribution coefficients (Kd') were determined for Pomona, Flow E, Umtanum basalts, and secondary mineralization associated with Pomona basalt at 23/sup 0/, 60/sup 0/ and 150/sup 0/C. Radionuclides used were /sup 75/Se, /sup 85/Sr, /sup 99/Tc, /sup 125/I, /sup 135/Cs, /sup 226/Ra, /sup 237/Np, /sup 238/U, /sup 241/Am, and /sup 241/Pu. Solution oxygen contents were controlled by the basalt/groundwater system (Eh = 600 to 700 mV), and were high (8.2 to 8.4 mg/l) at 23/sup 0/C. Oxygen contents and pH changed little in contact with basalt. The effects of temperature changes on radionuclide Kd' results varied depending upon the … continued below
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Ames, L.L. & McGarrah, J.E. September 1, 1980.
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Pacific Northwest Laboratory
Publisher Info: Battelle Pacific Northwest Labs., Richland, WA (USA)Place of Publication: Richland, Washington
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Description
Experimental radionuclide distribution coefficients (Kd') were determined for Pomona, Flow E, Umtanum basalts, and secondary mineralization associated with Pomona basalt at 23/sup 0/, 60/sup 0/ and 150/sup 0/C. Radionuclides used were /sup 75/Se, /sup 85/Sr, /sup 99/Tc, /sup 125/I, /sup 135/Cs, /sup 226/Ra, /sup 237/Np, /sup 238/U, /sup 241/Am, and /sup 241/Pu. Solution oxygen contents were controlled by the basalt/groundwater system (Eh = 600 to 700 mV), and were high (8.2 to 8.4 mg/l) at 23/sup 0/C. Oxygen contents and pH changed little in contact with basalt. The effects of temperature changes on radionuclide Kd' results varied depending upon the radionuclide involved, solution-solid reactions, and the relationship of the radionuclide to these reactions. For example, cesium Kd' values decreased from 3100 ml/g for Umtanum basalt at 23/sup 0/C to 120 ml/g at 150/sup 0/C. At the same time, strontium Kd' values increased for Umtanum basalt from 105 ml/g at 23/sup 0/C to complete removal at 150/sup 0/C and 40 days. Radionuclide adsorption coefficient measurements at higher temperatures and pressures were made in addition to the 23/sup 0/C, solution-solid contact time-conditional Kd (Kd') measurements. These include Kd' measurements with Umtanum basalt, Pomona basalt, Flow E basalt and secondary mineralization and radioisotopes of americium, cesium, iodine, neptunium, plutonium, radium, selenium, strontium, technetium and uranium. The additional temperatures involved were 60/sup 0/C, 150/sup 0/C, and 300/sup 0/C. At 150/sup 0/C, argon pressures of 6.9, 13.8, 20.7, and 27.6 MPa will be used to ascertain the effects of pressure changes on Kd' values. So far only the 6.9 MPa argon pressure has been investigated. The upper temperature of 250/sup 0/C is where thermal breakdown of dioctahedral smectites (secondary mineralization) begins.
Notes
NTIS, PC A04/MF A01.
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Keywords
- Actinide Isotopes
- Actinide Nuclei
- Alkali Metal Isotopes
- Alkaline Earth Isotopes
- Alpha Decay Radioisotopes
- Aluminium Compounds
- Aluminium Silicates
- Americium 241
- Americium Isotopes
- Basalt
- Beta Decay Radioisotopes
- Beta-Minus Decay Radioisotopes
- Cesium 135
- Cesium Isotopes
- Days Living Radioisotopes
- Distribution Functions
- Electron Capture Radioisotopes
- Environmental Transport
- Even-Even Nuclei
- Even-Odd Nuclei
- Functions
- Ground Water
- Heavy Nuclei
- High Temperature
- Hours Living Radioisotopes
- Hydrogen Compounds
- Igneous Rocks
- Intermediate Mass Nuclei
- Iodine 125
- Iodine Isotopes
- Isomeric Transition Isotopes
- Isotopes
- Mass Transfer
- Medium Pressure
- Medium Temperature
- Minerals
- Minutes Living Radioisotopes
- Neptunium 237
- Neptunium Isotopes
- Nuclei
- Odd-Even Nuclei
- Oxygen Compounds
- Ph Value
- Plutonium 241
- Plutonium Isotopes
- Radioisotopes
- Radionuclide Migration
- Radium 226
- Radium Isotopes
- Rocks
- Selenium 75
- Selenium Isotopes
- Silicates
- Silicon Compounds
- Smectite
- Strontium 85
- Strontium Isotopes
- Technetium 99
- Technetium Isotopes
- Temperature Effects
- Uranium 238
- Uranium Isotopes
- Volcanic Rocks
- Water
- Years Living Radioisotopes 052002* -- Nuclear Fuels-- Waste Disposal & Storage
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- Report No.: PNL-3146
- Grant Number: AC06-76RL01830
- Digital Object Identifier: https://doi.org/10.2172/6751781
- Office of Scientific & Technical Information Report Number: 6751781
- Archival Resource Key: ark:/67531/metadc1191900
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Ames, L.L. & McGarrah, J.E. Basalt-radionuclide distribution coefficient determinations. FY-1979 annual report, report, September 1, 1980; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1191900/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.