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

Appl Radiat Isot. 2023 Oct 28;204:111084. doi: 10.1016/j.apradiso.2023.111084. Online ahead of print.ABSTRACTHigh 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.PMID:38016258 | DOI:10.1016/j.apradiso.2023.111084

Source: Applied Radiation and Isotopes - November 28, 2023 Category: Radiology Authors: Seiichi Yamamoto Masao Yoshino Kohei Nakanishi Kei Kamada Akira Yoshikawa Hiroki Tanaka Jun Kataoka Source Type: research