Characterization of Ce-doped Li2O–ZnO–P2O5 Glasses for Thermal Neutron Detection

In this study, Mg 1.995−x SiO 4 :xCe, 0.005Tb (x = 0 and 0.01) single crystals were synthesized by the floating zone method and their photoluminescence (PL) and dosimetric properties were evaluated. In the PL process, emission peaks due to the 4f-4f transitions of Tb 3+ ions were observed in the x = 0 and 0.01 samples, and the emission peak due to the 5d-4f transitions of Ce 3+ ions was detected in the x = 0.01 sample. In the thermally stimulated luminescence (TSL) process, only emission peaks due to the 4f-4f transitions of Tb 3+ ions were observed in both samples, and the x = 0.01 sample had higher TSL intensity than the x = 0 sample. The x = 0.01 sample showed a lower detection limit of 0.01 mGy and a spatial resolution of 50.0 μm under X-ray irradiation.

Section: Resultsmentioning

confidence: 99%

Analysis of Photoluminescence and Dosimetric Properties of (Ce, Tb)-codoped Magnesium Orthosilicate Single Crystals

Ichiba¹,

Takebuchi²,

Kimura³

et al. 2023

“…Scintillators convert ionizing radiation into visible-UV photons, and they have been widely utilized to measure ionizing radiation in the fields of security, (1) medical imaging, (2,3) and resource exploration. (4,5) In general, required properties of scintillators include high scintillation output, short decay time, high energy resolution, and high effective atomic number; however, since no materials currently satisfy the requirements of all applications, R&D has been performed continuously on scintillators in various forms such as single crystals, (6)(7)(8)(9)(10)(11) ceramics, (12)(13)(14) films, (15,16) glasses, (17)(18)(19)(20)(21)(22)(23) and liquids. (24)(25)(26) Our research has focused on rare-earth-activated alkali-earth aluminates, which have been intensely studied in phosphor fields (27)(28)(29) ; in particular, Eu,Dy-co-doped SrAl 2 O 4 is a wellknown long-lifetime phosphorescent material.…”

Section: Introductionmentioning

confidence: 99%

Radiation-induced Luminescence Properties of Ce-doped SrAl2O4 Crystal and Translucent Ceramic

Nakauchi¹,

Nakamura²,

Kato³

et al. 2023

A comparative study on the radioluminescence properties of Ce-doped SrAl 2 O 4 single crystal and translucent ceramic was performed. The transmittance of the synthesized ceramic is 20-30% in the visible region. Both samples exhibit photo-and radioluminescence with a broad emission peaking at 380 nm. The decay curves are fitted by a single exponential decay function with decay time constants of 30-50 ns, consistent with the typical value of the emission for the 5d-4f transitions of Ce 3+ . From the pulse height spectra measured under 241 Am γ-ray (59.5 keV) irradiation, the scintillation light yields are 17000 ph/MeV for the single crystal and 6100 ph/ MeV for the synthesized ceramic. The scintillation light yield and afterglow of the present samples show a negative correlation.

“…Various types of neutron detectors such as scintillation, gas electron multiplier (GEM)-based, micro-pixel chamber (µ-PIC), and micro-channel plate (MCP) detectors have been reported. (12)(13)(14)(15)(16)(17) On the other hand, we are developing a detector based on a glass GEM to meet the specifications required for Bragg edge imaging with a simpler structure. Glass GEMs are detectors that use glass as a substrate, whereas conventional GEMs use a thin polyimide foil as an insulator.…”

Section: Introductionmentioning

confidence: 99%

Development of a Bragg-edge Neutron Transmission Imaging Detector Combined with Micro-structured Boron Cathode and Glass Gas Electron Multiplier

Fujiwara¹,

Kino²,

Oshima³

et al. 2023

A neutron detector with a micro-structured boron cathode and a glass gas electron multiplier (GEM) has been developed for time-of-flight Bragg edge neutron transmission imaging. The detector has a field of view of 100 × 100 mm 2 and 128 × 128 pixels (pixel size 0.8 × 0.8 mm 2 ). The neutron imaging performance of the detector was evaluated at a compact electron accelerator-driven neutron source (AISTANS). By comparison with a Li-glass detector, we found that our detector has a detection efficiency of 5% for 4 Å neutrons. In addition, a preliminary time-of-flight neutron imaging test was performed to observe the difference between the face-centered and body-centered cubic crystal structures, from which we confirmed that our detector has sufficient stability and time resolution for use in Bragg edge imaging analysis.