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Determination of 125I and 131I in Radioisotope Wastes

[+] Author Affiliations
Sang Hoon Kang, Ke Chon Choi, Heung N. Lee, Sun Ho Han, Kwang Yong Jee

Korea Atomic Energy Research Institute, Daejeon, South Korea

Paper No. ICEM2007-7290, pp. 769-772; 4 pages
doi:10.1115/ICEM2007-7290
From:
  • The 11th International Conference on Environmental Remediation and Radioactive Waste Management
  • 11th International Conference on Environmental Remediation and Radioactive Waste Management, Parts A and B
  • Bruges, Belgium, September 2–6, 2007
  • Conference Sponsors: Nuclear Division and Environmental Engineering Division
  • ISBN: 978-0-7918-4339-0 | eISBN: 0-7918-3818-8
  • Copyright © 2007 by ASME

abstract

In order to measure a low activity of 125 I and 131 I in radioisotope wastes, we took into consideration various sample preparation and separation methods, such as an acid decomposition, an acid leaching and a combustion method. In a previous study, the maximum chemical yield of iodine by an acid leaching was found to be 78.0%. However, in this study, the maximum chemical yield of the acid decomposition method and the combustion method with a radioiodine reference solution was found to be 99.1% and 84.5%, respectively. We selected the acid decomposition method for the analysis of radioisotope waste samples due to its high chemical yield and short preparation and separation time. The chemical yield of the acid decomposition method depends on the reaction time at each experimental stage, added amount of H3 PO3 and H2 O2 , and the pH of the condensed solution and the condition of the AgI precipitation. The important point for the highest recovery rate from a acid decomposition method is to maintain enough reaction time and pour 10 mL of 30% H3 PO3 before a distillation, and drop 1 mL of H2 O2 when the condensed solution is trapped in the Florence flask. Through a study of the acid decomposition method we found an optimal preparation and separation method of 125 I and 131 I in radioisotope wastes due to the merits of a short reaction time and high recovery rate, and a counting system was applied to LEPS for the 125 I and HP Ge gamma-ray spectrometer for 131 I.

Copyright © 2007 by ASME
Topics: Radioisotopes

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