@misc{oai:repo.qst.go.jp:00068208,
 author = {Sarata, Kumar Sahoo and Muramatsu, Yasuyuki and Matsuzaki, Hiroyuki and Yoshida, Satoshi and サフー サラタ クマール and 吉田 聡},
 month = {Oct},
 note = {Following the Chernobyl nuclear power plant (CNPP) accident in 1986, of all the radionuclides released into the environment, the isotopes of iodine and cesium were the most hazardous for the population. Due to the short half-life of 131I (8 days) it is now not possible to measure the level of this nuclide contaminated at the time of the accident. Since long-lived 129I (1.6 x107y) was also released from the reactor at a certain 131I/129I ratio, it should be possible to reconstruct the 131I levels from the measurement of 129I in environmental samples such as soil. In this study we have used soil samples collected from the 30 Km exclusion zone of Chernobyl Nuclear Power Plant. Soil sample (0.2~1g) was placed in a quartz tube and heated at 1000 deg cent under a flow of oxygen gas. The evaporated iodine was collected with a trap containing TMAH. After the addition of iodine carrier, iodine fraction was extracted into carbon tetrachloride as I2, then it was back extracted into aqueous solution as I-. Finally iodine was precipitated as AgI, and its 129I/127I ratio was determined using AMS (accelerator mass spectrometry) at the MALT-AMS facility, University of Tokyo. Concentration of stable iodine (127I) was measured by ICP-MS (inductively coupled plasma mass spectrometry). The atomic ratio of 129I/127I ranged from 1.2 x10-6 to 4.3 x10-5 and concentration of 129I ranged from 4.6 to 170 mBq/Kg. The highest concentration of 129I was found near the CNPP destroyed reactor. Vertical distribution of the 129I concentrations showed that the nuclide was accumulated in the top layer. Low stable iodine concentrations were observed in soils of the Chernobyl area., 第8回ヨウ素利用研究国際シンポジウム},
 title = {Studies on the 129I and 127I in soil samples collected from Chernobyl area},
 year = {2005}
}