Performance test of Si PIN photodiode line scanner for thermal neutron detection

Daisuke Totsuka, Takayuki Yanagida, Kentaro Fukuda, Noriaki Kawaguchi, Yutaka Fujimoto, Jan Pejchal, Yuui Yokota, Akira Yoshikawa

Research output: Contribution to journalArticlepeer-review

158 Citations (Scopus)


Thermal neutron imaging using Si PIN photodiode line scanner and Eu-doped LiCaAlF6 crystal scintillator has been developed. The pixel dimensions of photodiode are 1.18 mm (width)×3.8 mm (length) with 0.4 mm gap and the module has 192 channels in linear array. The emission peaks of Eu-doped LiCaAlF6 after thermal neutron excitation are placed at 370 and 590 nm, and the corresponding photon sensitivities of photodiode are 0.04 and 0.34 A/W, respectively. Polished scintillator blocks with a size of 1.18 mm (width)×3.8 mm (length)×5.0 mm (thickness) were wrapped by several layers of Teflon tapes as a reflector and optically coupled to the photodiodes by silicone grease. JRR-3 MUSASI beam line emitting 13.5 meV thermal neutrons with the flux of 8×105 n/cm2+ s was used for the imaging test. As a subject for imaging, a Cd plate was moved at the speed of 50 mm/s perpendicular to the thermal neutron beam. Analog integration time was set to be 416.6 μs, then signals were converted by a deltasigma A/D converter. After the image processing, we successfully obtained moving Cd plate image under thermal neutron irradiation using PIN photodiode line scanner coupled with Eu-doped LiCaAlF6 scintillator.

Original languageEnglish
Pages (from-to)399-402
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1
Publication statusPublished - 2011 Dec 11


  • Line scanner
  • PIN photodiode
  • Scintillator
  • Thermal neutron imaging

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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