Development of a low-energy high resolution X-ray camera for high-energy gamma photon background environments

Koki Ando*, Seiichi Yamamoto, Keisuke Kurita, Nobuo Suzui, Yong Gen Yin, Satomi Ishii, Naoki Kawachi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Although a high-energy gamma camera can obtain images of 137Cs distribution by detecting the 662-keV gamma photons, its spatial resolution is reduced because high-energy gamma photons penetrate the edge of the pinhole collimator. To solve this problem, we developed a low-energy X-ray camera that detects the characteristic X-ray photons (32–37 keV) that are emitted from 137Cs to obtain high resolution images. We used a 45 × 45 × 1-mm-thick NaI(Tl) scintillator that was encapsulated in 0.1-mm-thick aluminum and optically coupled to a 2-inch square, position sensitive photomultiplier tube (Hamamatsu Photonics, PSPMT:H12700 MOD) as an imaging detector. The imaging detector was encased in a 2-cm-thick tungsten alloy container and a pinhole collimator was attached to its camera head. The spatial resolution and sensitivity were ∼5 mm full-width at half-maximum and ∼0.6 cps/MBq for the 1.5-mm pinhole collimator 10 cm from the collimator surface, respectively. We administered 5 MBq of 137Cs to a soybean seedling, imaged the distribution of radionuclides for six hours, and successfully obtained a high resolution image of it with our developed X-ray camera. We believe our camera will be a powerful tool for such 137Cs imaging in plants.

Original languageEnglish
Pages (from-to)933-939
Number of pages7
JournalJournal of Nuclear Science and Technology
Issue number9
Publication statusPublished - 2017 Sept 2
Externally publishedYes


  • background
  • Cesium 137
  • experiment
  • gamma ray
  • high resolution
  • low energy
  • X-ray

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


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