Radiation chemistry of salt-mine brines and hydrates. [Gamma radiation]
Description
Certain aspects of the radiation chemistry of NaCl-saturated MgCl/sub 2/ solutions and MgCl/sub 2/ hydrates at temperatures in the range of 30 to 180/sup 0/C were investigated through experiments. A principal objective was to establish the values for the yields of H/sub 2/ (G(H/sub 2/)) and accompanying oxidants in the gamma-ray radiolysis of concentrated brines that might occur in waste repositories in salt. We concluded that G(H/sub 2/) from gamma-irradiated brine solution into a simultaneously irradiated, deaerated atmosphere above the solution is between 0.48 and 0.49 over most of the range 30 to 143/sup 0/C. The yield is probably somewhat … continued below
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73 pages
Creation Information
Jenks, G. H.; Walton, J. R.; Bronstein, H. R. & Baes Jr., C. F. July 1, 1981.
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Oak Ridge National Laboratory
Publisher Info: Oak Ridge National Lab., TN (USA)Place of Publication: Tennessee
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Description
Certain aspects of the radiation chemistry of NaCl-saturated MgCl/sub 2/ solutions and MgCl/sub 2/ hydrates at temperatures in the range of 30 to 180/sup 0/C were investigated through experiments. A principal objective was to establish the values for the yields of H/sub 2/ (G(H/sub 2/)) and accompanying oxidants in the gamma-ray radiolysis of concentrated brines that might occur in waste repositories in salt. We concluded that G(H/sub 2/) from gamma-irradiated brine solution into a simultaneously irradiated, deaerated atmosphere above the solution is between 0.48 and 0.49 over most of the range 30 to 143/sup 0/C. The yield is probably somewhat lower at the lower end of this range, averaging 0.44 at 30 to 45/sup 0/C. Changes in the relative amounts of MgCl/sub 2/ and NaCl in the NaCl-saturated solutions have negligible effects on the yield. The yield of O/sub 2/ into the same atmosphere averages 0.13, independent of the temperature and brine composition, showing that only about 50% of the radiolytic oxidant that was formed along with the H/sub 2/ was present as O/sub 2/. We did not identify the species that compose the remainder of the oxidant. We concluded that the yield of H/sub 2/ from a gamma-irradiated brine solution into a simultaneously irradiated atmosphere containing 5 to 8% air in He may be greater than the yield in deaerated systems by amounts ranging from 0% for temperatures of 73 to 85/sup 0/C, to about 30 and 40% for temperatures in the ranges 100 to 143/sup 0/C and 30 to 45/sup 0/C, respectively. We did not establish the mechanism whereby the air affected the yields of H/sub 2/ and O/sub 2/. The values found in this work for G(H/sub 2/) in deaerated systems are in approximate agreement with the value of 0.44 for the gamma-irradiation yield of H/sub 2/ in pure H/sub 2/O at room temperature. They are also in agreement with the values predicted by extrapolation from the findings of previous researchers for the value for G(H/sub 2/) in 2 M NaCl solutions at room temperature.
Physical Description
73 pages
Notes
NTIS, PC A04/MF A01.
Subjects
Keywords
- Alkali Metal Compounds
- Alkaline Earth Metal Compounds
- Aqueous Solutions
- Brines
- Chemical Radiation Effects
- Chemical Reactions
- Chemistry
- Chlorides
- Chlorine Compounds
- Decomposition
- Dispersions
- Electromagnetic Radiation
- Elements
- G Value
- Gamma Radiation
- Geologic Deposits
- Halides
- Halogen Compounds
- High Temperature
- Hydrates
- Hydrogen
- Hydrolysis
- Ionizing Radiations
- Lysis
- Magnesium Chlorides
- Magnesium Compounds
- Management
- Medium Temperature
- Mixtures
- Nonmetals
- Oxygen
- Radiation Chemistry
- Radiation Effects
- Radiations
- Radioactive Waste Disposal
- Radiolysis
- Salt Deposits
- Sodium Chlorides
- Sodium Compounds
- Solutions
- Solvolysis
- Underground Disposal
- Waste Disposal
- Waste Management 400600* -- Radiation Chemistry
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- Other: DE81026536
- Report No.: ORNL-5726
- Grant Number: W-7405-ENG-26
- Digital Object Identifier: https://doi.org/10.2172/6345215
- Office of Scientific & Technical Information Report Number: 6345215
- Archival Resource Key: ark:/67531/metadc1203846
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- July 1, 1981
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- July 5, 2018, 11:11 p.m.
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Jenks, G. H.; Walton, J. R.; Bronstein, H. R. & Baes Jr., C. F. Radiation chemistry of salt-mine brines and hydrates. [Gamma radiation], report, July 1, 1981; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1203846/: accessed July 15, 2026), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.