A study on analytical methods of radioiodine in a high-temperature, high-pressure water in-pile loop

Defect fuel tests have been carried out in the high-temperature, high-pressure water in-pile loop (OWL-1) of JMTR. The analytical methods of radioiodine released into the loop water during these experiments were studied. It was shown that the results by the analytical method, in which radioiodine (I-) was oxidized to I0 and extracted into CCl4, were influenced by the chemical forms of radioiodine. It was also shown that the method in which KI and KIO3 were added as carrier, was appropriate for the measurement of radioiodine in the loop water. (author)