PIXE analyses of cesium in rice grains

Hiroyuki Sugai, Keizo Ishii, Shigeo Matsuyama, Atsuki Terakawa, Yohei Kikuchi, Hiroaki Takahashi, Azusa Ishizaki, Fumito Fujishiro, Hirotsugu Arai, Naoyuki Osada, Masahiro Karahashi, Yuichiro Nozawa, Shosei Yamauchi, Kosuke Kikuchi, Shigeki Koshio, Koji Watanabe

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The Fukushima nuclear power plant accident released vast amounts of radioactive material into the environment. For instance, 134Cs and 137Cs have half-lives of about 2 and 30 years, respectively, and emit many harmful gamma rays. In 2012, rice with radioactivity >100 Bq/kg was occasionally reported in Fukushima prefecture. To determine where and how cesium accumulates in rice, we grew rice in soil containing stable cesium and investigated the distribution of cesium in rice using particle-induced X-ray emission (PIXE). This study found that cesium is accumulated in bran and germ at high concentrations, and white rice contains 40% of the cesium found in brown rice.

Original languageEnglish
Pages (from-to)191-193
Number of pages3
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Issue numberPART A
Publication statusPublished - 2014


  • Cesium
  • PIXE
  • Rice


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