title: Determination of 129I in Fukushima soil samples by ICP-MS with an octopole reaction system.
abstract: A method was developed for the determination of (129)I in soil samples that uses an ICP-MS equipped with an octopole reaction system.  Oxygen was used as the reaction gas for reducing the background intensity of m/z 129, principally by (129)Xe(+).  The contribution of polyatomic ions, such as (127)IH(2)(+), could be effectively corrected for by assuming a production ratio ((127)IH(2)(+)/(127)I(+) = 3 × 10(-8)).  The measured (129)I/(127)I ratios in a NIST standard solution and Fukushima soil samples are consistent with the expected value within the analytical error.  This method provides a powerful tool for investigating radioiodine contamination in Fukushima and elsewhere.
authors: Department of Chemistry, Faculty of Science, Gakushuin University, Tokyo, Japan. takeshi.ohno@gakushuin.ac.jp
authors: Takeshi
authors: T
authors: Ohno
authors: Yasuyuki
authors: Y
authors: Muramatsu
authors: Chiaki
authors: C
authors: Toyama
authors: Kazumi
authors: K
authors: Nakano
authors: Shinichiro
authors: S
authors: Kakuta
authors: Hiroyuki
authors: H
authors: Matsuzaki