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Report No.
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New determination method for iodine-129 in the environmental samples by using MIP-MS

Uezu, Yasuhiro; Nakano, Masanao ; Fujita, Hiroki; Watanabe, Hitoshi; Maruo, Yoshihiro; Shinohara, Kunihiko

Iodine-129 is an important radionuclide for environmental assessment, because it has a long half-life. A new analytical technique with Microwave Induced Plasma Mass Spectrometry (MIP-MS) was applied to the determination of iodine-129 ($$^{129}$$I) in the environmental samples. Environmental samples contain a large amount of matrices elements. Therefore, the interference elements were eliminated by ashing at 1000$$^{circ}$$C, and iodine was trapped by activated charcoal and finally extracted by tetramethylammonium hydroxide (TMAH). I-129 in the soil sample was also analyzed by conventional method [neutron activation analysis (NAA)] and MIP-MS method. The analytical data by MIP-MS and NAA methods showed excellent agreement.

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