Development of an event-by-event based Li–ZnS(Ag) neutron imaging detector with selective neutron detection capability

Seiichi Yamamoto*, Masao Yoshino, Kohei Nakanishi, Kei Kamada, Akira Yoshikawa, Hiroki Tanaka, Jun Kataoka

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

High sensitivity and high resolution is desired in such technologies as neutron radiography. However, the contamination of gamma photons in neutron images decreases the accuracy of neutron radiography. To solve this problem, we developed an event-by-event based neutron imaging system that can selectively detect neutrons. The developed neutron imaging system consists of an Li–ZnS(Ag) scintillator plate optically coupled to a flat panel photomultiplier tube (FP-PMT) with a light guide. Scintillation light emitted from the Li–ZnS(Ag) by the interaction with neutron-induced particles is used to calculate the position based on the center of mass calculations. The spatial resolution of the neutron imaging detector is ∼2.3 mm FWHM, and the sensitivity for 252Cf at 2 cm from the source with 2-cm-thick polystyrene is 20 cps/MBq. Background count fraction from 60Co gamma photons was 0.2 %. For various types of neutron absorption phantoms, high-contrast and high-resolution neutron images are obtained with the developed neutron imaging detector using a252Cf neutron source.

Original languageEnglish
Article number111084
JournalApplied Radiation and Isotopes
Volume204
DOIs
Publication statusPublished - 2024 Feb

Keywords

  • FP-PMT
  • Induced triton and alpha particle
  • Li–ZnS(Ag)
  • Neutron

ASJC Scopus subject areas

  • Radiation

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