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High-energy X-ray detection capabilities of Hf-loaded plastic scintillators synthesized by sol–gel method

  • Kei KagamiEmail author
  • Masanori Koshimizu
  • Yutaka Fujimoto
  • Syunji Kishimoto
  • Rie Haruki
  • Fumihiko Nishikido
  • Keisuke Asai
Article
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Abstract

The high-energy X-ray detection capabilities of hafnium oxide-doped organosilica plastic scintillators were analysed. Plastic scintillators with different concentrations of Hf were synthesized via the sol–gel method. In the photoluminescence emission spectra and X-ray-excited radioluminescence spectra, all of the plastic samples showed broad emission bands peaking between 350 and 500 nm derived from the fluorescence of the organic phosphor b-PBD. The maximum detection efficiency for a thickness of 1 mm towards 67.41 keV high-energy X-ray was estimated to be 6.3% (Hf 10 wt%) which is 3.7 times larger than that of the undoped sample and 1.9 times larger than that of the commercialized Pb 5 wt%-doped plastic scintillator EJ-256. The full width at half maximum time resolutions were estimated to be approximately 0.4 to 0.6 ns, which is almost independent of the Hf concentration of Hf. Therefore, the detection efficiency towards high-energy X-rays was successfully improved while maintaining the original high time resolution of plastic scintillators by adding Hf to the plastic scintillator at high concentrations.

Notes

Acknowledgements

This research was supported by a Grant-in-Aid for Scientific Research (A) (Grant No. 18H03890, 2018–2021). A part of this research is based on the Cooperative Research Project of Research Center for Biomedical Engineering, Ministry of Education, Culture, Sports, Science and Technology.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Applied Chemistry, Graduate School of EngineeringTohoku UniversitySendaiJapan
  2. 2.High Energy Accelerator Research Organization (KEK)TsukubaJapan
  3. 3.National Institute of Radiological ScienceNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan

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