| Autor: |
Güntay, Salih, Cripps, Robin C., Jäckel, Bernd, Bruchertseifer, Horst |
| Předmět: |
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| Zdroj: |
Nuclear Technology; Jun2005, Vol. 150 Issue 3, p303-314, 12p, 1 Diagram, 3 Charts, 6 Graphs |
| Abstrakt: |
The decomposition of aqueous colloidal suspensions of AgI induced by ionizing radiation was investigated under various conditions using 188Re as an in situ beta-radiation source. The suspensions were stabilized by an initial excess of either I- or Ag+ ions. Although the results were somewhat scattered, the following trends were observed. With an initial excess of I- and under strong oxidizing conditions (N2O sparging) at pH 2, ∼65% AgI was decomposed into nonvolatile and volatile iodine (ratio 2:1)for doses of ∼20 kGy, and up to ∼80% was decomposed (mostly nonvolatile iodine) at pH 5. Chloride ions greatly enhanced the volatile and lowered the nonvolatile fractions. Little decomposition (<10%) was obtained with air sparging at both pH 2 and pH 5. Chloride ions increased the maximum decompositions to ∼60% (∼47% volatile) and ∼20% (mainly nonvolatile iodine), respectively. With an initial excess of Ag+ with N2O sparging and at pH 2 and pH 5, very little volatile iodine was produced. The maximum decomposition was ∼20% after ∼20 kGy. Chloride ion addition at pH 2 had greatly enhanced the volatile iodine yield. The relevance of these results to the possible release of iodine to the environment following a nuclear reactor accident is discussed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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