Abstract
129I is expected to be released from radioactive waste in deep geological repositories as dissolved iodide (I−). Performance assessment calculations predict that 129I is one of the dose-determining radioisotopes due to its long half-life and its weak retention by common minerals. Preliminary sorption experiments showed that LDH-type minerals could control iodide retention in the near field of a cement-based underground repository. AFm-SO4 [Ca2Al(OH)6(SO4)0.5·nH2O], also known as “monosulfate”, was found to be a potential candidate for iodine retention. Thus, replacing SO 4 2− by I− in the interlayer could potentially reduce the mobility and radiological doses of 129I released from nuclear waste in deep geological cementitious repositories.
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