Organic liquid and nanocomposite scintillators for spectroscopic detections

Hao, Yuxin; Zhao, Roger; Redding, Caleb; Chen, Tianheng; Hajagos, Tibor Jacob; Ferrelli, Geena L.; Zaldivar, Rafael J.; Hayward, Jason P.; Pei, Qibing

doi:10.1117/12.2595540

Cited by 3 publications

(6 citation statements)

References 24 publications

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“…All 2 mm-thick nanocomposites showed a high EWLT, which only slightly decreased with increased NP loadings, indicating minor Rayleigh scattering due to the addition of NPs. Compared to a commercial scintillator, EJ-212, of which the EWLT is 92.2%, the unloaded nanocomposite (0% NPs + 20% MF) showed a lower EWLT of 85.9%. This is due to the formation of crystalline MF aggregates, which scattered the light .…”

Section: Resultsmentioning

confidence: 84%

Fast Spectroscopic Gamma Scintillation Using Hafnium Oxide Nanoparticles–Plastic Nanocomposites

Yu,

Winardi,

Han

et al. 2023

Chem. Mater.

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Fast scintillators with a spectroscopic gamma response are essential in nuclear security and medical imaging. However, few individual scintillation materials exhibit both fast scintillation decay and high photopeak energy resolution. We report a nanocomposite scintillator comprising 40 wt % of hafnium oxide nanoparticles uniformly dispersed in a luminescent plastic matrix. The nanoparticles have an average diameter of 4.2 nm and are covalently attached to the polymer matrix to prevent agglomeration and thus achieve high optical transparency across nanocomposite monoliths up to 8.5 mm thick. The measured transmittance is around 80% across the emission range. Gamma pulse scintillation has a fast decay time constant of 2.5 ns and high light output of 8000−9000 photons/MeV. The gamma scintillation shows energy proportionality from 32 to 1275 keV. A 1.93 cm 3 nanocomposite produces photopeaks at 32 and 662 keV for 137 Cs and at 511 and 1275 keV for 22 Na. The photopeak energy resolution at 662 keV is 7.2−9.1%.

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Section: Resultsmentioning

confidence: 84%

Fast Spectroscopic Gamma Scintillation Using Hafnium Oxide Nanoparticles–Plastic Nanocomposites

Yu,

Winardi,

Han

et al. 2023

Chem. Mater.

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“…The calculated EWLT values of the liquid scintillator are displayed in Figure d. The liquid containing 0.75% PM-580 without any QDs had a EWLT of 68.3%, which is lower than that of a commercial liquid scintillator, EJ-305 (EWLT = 91.7%) . This may be attributed to the small Stokes shift of PM-580 (15 nm), which increases the likelihood of reabsorption of the emitted photons in a 2 mm light path.…”

Section: Resultsmentioning

confidence: 96%

“…The 137 Cs radioluminescence decay curve was measured using time-correlated single photon counting method in the home-built system as was described in our previous work. , Briefly, a Hamamatsu H2431-50 fast PMT was used as the start PMT, and a Hamamatsu H10721P-110 PMT was used as the stop PMT. The sample was placed in a Teflon sample holder and optically coupled to the start PMT using optical grease.…”

Section: Methodsmentioning

confidence: 99%

“…The liquid containing 0.75% PM-580 without any QDs had a EWLT of 68.3%, which is lower than that of a commercial liquid scintillator, EJ-305 (EWLT = 91.7%). 31 This may be attributed to the small Stokes shift of PM-580 (15 nm), which increases the likelihood of reabsorption of the emitted photons in a 2 mm light path. The use of a single dye here also accounts for the EWLT loss because conventional organic scintillators employ a secondary dye to mitigate the self-absorption of the primary dye.…”

Section: Synthesis Of Cspbbr 3 Qd Loaded Liquid Scintillatorsmentioning

confidence: 99%

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Liquid Scintillators Loaded with up to 40 Weight Percent Cesium Lead Bromide Quantum Dots for Gamma Scintillation

Hao

Chen

Han

et al. 2022

ACS Appl. Nano Mater.

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Cesium lead bromide quantum dot (CsPbBr3 QD) is emerging as a promising luminescent material for gamma ray detection. However, its intensive self-absorption traps the luminescent photons generated and diminishes the scintillation light yield. The self-absorption is magnified at high CsPbBr3 QD loading and large scintillator volume, which are required to effectively attenuate gamma photons. We report a liquid scintillator loaded with up to 40 wt % of CsPbBr3 QDs. Pyrromethene 580 (PM-580), a fluorescent dye, was co-dissolved in the solution as a fluorescence resonance energy-transfer acceptor to overcome the self-absorption of the QDs. The rapid energy transfer from the QDs to PM-580 also accelerates the scintillation decay kinetics. The scintillation light yield of the liquid containing 20 wt % QDs and 0.75 wt % PM-580 was 8800 photons/MeV. The decay lifetime is 24.3 ns, faster than most inorganic crystal scintillators. The light yield was 7300 photons/MeV at 40 wt % QD loading. Gamma pulse spectroscopy of the 40 wt % QD liquid produced the 662 keV gamma photopeak with a 27% energy resolution, demonstrating the potential of the CsPbBr3 QD loaded organic scintillators for spectroscopic gamma detection.

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“…For surface modification of the hafnium oxide nanoparticles, the pristine oleylamine ligand was partially exchanged by bis(2-(methacryloyloxy)ethyl) phosphate as described in a literature protocol. ,− After ligand exchange, the nanoparticles were vacuum-dried, transferred into a nitrogen-filled glovebox, and dispersed into a degassed formulation containing 5 vol % divinylbenzene in methylstyrene, after which FIrPic, Luperox-231 (thermal initiator, 0.1 vol %), mCP, and MF were dissolved into the solution. The curing solution was transferred to a glass vial (cleaned with 3:1 sulfuric acid/30 wt % hydrogen peroxide and treated with trichloro(1 H ,1 H ,2 H ,2 H -tridecafluoro- n -octyl)silane) and sealed with a plastic lid and polytetrafluoroethylene (PTFE) film.…”

Section: Methodsmentioning

confidence: 99%

Nanocomposite Scintillators Loaded With Hafnium Oxide and Phosphorescent Host and Guest for Gamma Spectroscopy

Winardi,

Han,

et al. 2024

Chem. Mater.

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Gamma sensitive plastic scintillators are of critical importance in the fields of nuclear nonproliferation, medical imaging, and high energy physics. However, there is often a trade-off between high light yield and high loading of high-Z components, both of which play an essential role in gamma ray detection. This work takes advantage of triplet exciton harvesting to increase gamma light yield by utilizing 1,3-di(9H-carbazol-9-yl)benzene and 9,9-dimethyl-9H-fluorene as triplet hosts to facilitate Dexter energy transfer to bis[2-(4,6-difluorophenyl)pyridinato-C2,N](picolinato)iridium(III) (FIrPic), a blue light emitting phosphorescent dye. A plastic scintillator containing 20 wt % MF, 10 wt % mCP, and 2 wt % FIrPic has a high gamma light yield of 14 800 Ph/MeV. Incorporating 20−35 wt % hafnium oxide nanoparticles into this organic matrix results in nanocomposites that demonstrate a gamma photopeak energy resolution of 6.4−9.7% at 662 keV while still retaining a high gamma light yield between 8800 and 10 800 Ph/MeV.

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Organic liquid and nanocomposite scintillators for spectroscopic detections

Cited by 3 publications

References 24 publications

Fast Spectroscopic Gamma Scintillation Using Hafnium Oxide Nanoparticles–Plastic Nanocomposites

Fast Spectroscopic Gamma Scintillation Using Hafnium Oxide Nanoparticles–Plastic Nanocomposites

Liquid Scintillators Loaded with up to 40 Weight Percent Cesium Lead Bromide Quantum Dots for Gamma Scintillation

Nanocomposite Scintillators Loaded With Hafnium Oxide and Phosphorescent Host and Guest for Gamma Spectroscopy

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