Development of a GdSiO (GPS) Scintillator-Based Alpha Imaging Detector for Rapid Plutonium Detection in High-Radon Environments

Yuki Morishita*, Kenji Izaki, Junichi H. Kaneko, Seiichi Yamamoto, Mikio Higuchi, Tatsuo Torii

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We developed a Gd2Si2O7 (GPS) scintillator-based alpha imaging detector and demonstrated its effectiveness by evaluating the actual Pu particle and 222Rn progeny. The GPS scintillator plate was prepared by a sintering method. The outer dimensions of the GPS scintillator plate were $5\times 5$ cm, and the scintillator layer was approximately $50~\mu \text{m}$ on a 3-mm-thick high-transparency glass. The plate was optically coupled to a position-sensitive photomultiplier tube (Hamamatsu H8500, Hamamatsu, Japan) with silicone grease. The developed imaging detector exhibited good uniformity; Pu particle activities were accurately evaluated at 14 different positions and the difference in activity was within ±6%. The radon-222 progeny counts were reduced by 65.3% by applying an energy window. Although the Pu/222Rn progeny activity ratio was 1/51, the Pu particle was successfully identified among the 222Rn progeny within the 5-min measurement time. The imaging detector has an excellent ability for detecting Pu among the 222Rn progeny. Thus, this detector is useful for alpha contamination monitoring in high-radon-background environments.

Original languageEnglish
Article number9162144
Pages (from-to)2203-2208
Number of pages6
JournalIEEE Transactions on Nuclear Science
Volume67
Issue number10
DOIs
Publication statusPublished - 2020 Oct
Externally publishedYes

Keywords

  • Alpha-particle imaging detector
  • Gd₂Si₂O₇ (GPS) scintillator plate
  • plutonium
  • radon

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering

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