Journal Article Characteristic X-ray detector: in-situ imaging of radioactive contaminant distribution

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

82pp.26 - 30 , 2015-11 , Elsevier
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 thedistribution 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.

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