Radiation Chemical Effects in the Near Field of a Final Disposal Site - I: Radiolytic Products Formed in Concentrated NaCl Solutions

Journal Article · Sat Jan 15 00:00:00 EST 2000 · Nuclear Technology

OSTI ID:20822125

Kelm, M; Bohnert, E ^[1]

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1. Forschungszentrum Karlsruhe (Germany)

The yields of the different radiolytic products formed by gamma radiolysis from NaCl brines at ambient temperature and dose rates between 0.1 and 1 kGy/h were determined. At a chloride concentration of 5.3 mol/l, H{sub 2}, O{sub 2}, and ClO{sub 3}{sup -} were formed proportional to the dose and independent from the dose rate with G values of 0.6, 0.16, and 0.074, respectively. At a concentration of 2 mol/l, the chlorate yield dropped to a value close to zero, and the gas composition became stoichiometric. At pH 12 and in the presence of heavy metal ions, the yield of oxygen increased at the expense of chlorate. The concentrations of hypochlorite and chlorite were usually in the micromole per litre range. In pressurized solutions of 5.3 mol/l Cl{sup -} where all radiolytic gases were kept dissolved, equilibrium concentrations of radiolytic products were almost reached at a dose of {approx}1 MGy. The partial pressure of radiolytic gases was {approx}35 bars, and the chlorate concentration was {approx}170 {mu}mol/l.

• OSTI ID: 20822125
• Journal Information: Nuclear Technology, Vol. 129, Issue 1; Other Information: Copyright (c) 2006 American Nuclear Society (ANS), United States, All rights reserved. http://epubs.ans.org/; Country of input: International Atomic Energy Agency (IAEA); ISSN 0029-5450
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
AMBIENT TEMPERATURE
BRINES
CHLORATES
CHLORINE IONS
DOSE RATES
DOSES
GASES
HEAVY METALS
HYDROGEN
OXYGEN
PARTIAL PRESSURE
PH VALUE
RADIOACTIVE EFFLUENTS
RADIOACTIVE WASTE DISPOSAL
RADIOLYSIS
SODIUM CHLORIDES
SOLUTIONS