Characteristic X-ray detector: In-situ imaging of radioactive contaminant distributions. (November 2015)

• Record Type: Journal Article
• Authors: Kobayashi, Shingo; Shinomiya, Takayuki; Yoshida, Toru; Kitamura, Hisashi; Shirakawa, Yoshiyuki; Kurita, Kazuyoshi; Uchihori, Yukio
• Is Part Of: Radiation measurements. Volume 82(2015:Nov.)
• Page Start: 26
• Page End: 30
• Publication Date: 2015-11
• Subjects: Characteristic X-ray detector -- Gamma camera -- Fukushima Dai-ichi nuclear power station -- Radiation safety -- Decontamination; Nuclear emulsions -- Periodicals; Particle tracks (Nuclear physics) -- Periodicals; Thermoluminescence -- Periodicals; Cosmic rays -- Periodicals; Radiation -- Measurement -- Periodicals; Radiometry -- Periodicals; Radiation Monitoring -- Periodicals; Émulsions nucléaires -- Périodiques; Particules (Physique nucléaire) -- Traces -- Périodiques; Thermoluminescence -- Périodiques; Rayonnement cosmique -- Périodiques; Radiométrie -- Périodiques; 539.77
• DOI: 10.1016/j.radmeas.2015.08.001
• Languages: English
• ISSNs: 1350-4487

Abstract

Abstract: 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 137 Cs, 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. Highlights: We tested a characteristic X-ray detector (CXRD) to image Cs-137 distribution. The CXRD can make an image of Cs-137 contamination by detecting characteristic X-rays. The correlation between X-ray image and Cs137 contamination in-situ was tested. The CXRD has good performance to image hotspots in a contaminated area.