Characteristic X-ray detector: In-situ imaging of radioactive contaminant distributions

Shingo Kobayashi*, Takayuki Shinomiya, Toru Yoshida, Hisashi Kitamura, Yoshiyuki Shirakawa, Kazuyoshi Kurita, Yukio Uchihori

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


The characteristic X-ray detector (CXRD), a CsI(Tl) scintillator with a 50-mm diameter, is a directional X-ray sensor that measures characteristic X-rays from radioactive material, such as 137Cs, and identifies the direction of radioactive contamination. We evaluated a CXRD and visualized the distribution of radioactivity in the contaminated area near the Fukushima Dai-ichi nuclear power station, where the ambient dose equivalent rate was 2.1 μSv/h at 1 m above ground level. We found a good correlation between the characteristic X-ray fluxes and the distribution of radioactive contaminants with a 0.823 Pearson product-moment correlation coefficient.

Original languageEnglish
Pages (from-to)26-30
Number of pages5
JournalRadiation Measurements
Publication statusPublished - 2015 Dec 1
Externally publishedYes


  • Characteristic X-ray detector
  • Decontamination
  • Fukushima Dai-ichi nuclear power station
  • Gamma camera
  • Radiation safety

ASJC Scopus subject areas

  • Radiation
  • Instrumentation


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