Nuclear Engineering and Technology (Jul 2024)

Development of a dual-mode energy-resolved neutron imaging detector: High spatial resolution and large field of view

  • Wenqin Yang,
  • Jianrong Zhou,
  • Jianqing Yang,
  • Xingfen Jiang,
  • Jinhao Tan,
  • Lin Zhu,
  • Xiaojuan Zhou,
  • Yuanguang Xia,
  • Li Yu,
  • Xiuku Wang,
  • Haiyun Teng,
  • Jiajie Li,
  • Yongxiang Qiu,
  • Peixun Shen,
  • Songlin Wang,
  • Yadong Wei,
  • Yushou Song,
  • Jian Zhuang,
  • Yubin Zhao,
  • Junrong Zhang,
  • Zhijia Sun,
  • Yuanbo Chen

Journal volume & issue
Vol. 56, no. 7
pp. 2799 – 2805

Abstract

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Energy-resolved neutron imaging is an effective way to investigate the internal structure and residual stress of materials. Different sample sizes have varying requirements for the detector's imaging field of view (FOV) and spatial resolution. Therefore, a dual-mode energy-resolved neutron imaging detector was developed, which mainly consisted of a neutron scintillator screen, a mirror, imaging lenses, and a time-stamping optical fast camera. This detector could operate in a large FOV mode or a high spatial resolution mode. To evaluate the performance of the detector, the neutron wavelength spectra and the multiple spatial resolution tests were conducted at CSNS. The results demonstrated that the detector accurately measured the neutron wavelength spectra selected by a bandwidth chopper. The best spatial resolution was about 20 μm in high spatial resolution mode after event reconstruction, and a FOV of 45.0 mm × 45.0 mm was obtained in large FOV mode. The feasibility was validated to change the spatial resolution and FOV by replacing the scintillator screen and adjusting the lens magnification.

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