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SUMMARY:Polymer Composite Scintillators Based on Halide Perovskite Nanocry
 stals  for X-Ray Imaging
DTSTART;VALUE=DATE-TIME:20261027T162500Z
DTEND;VALUE=DATE-TIME:20261027T163000Z
DTSTAMP;VALUE=DATE-TIME:20261102T230105Z
UID:indico-contribution-6492@cern.ch
DESCRIPTION:Speakers: Aleksandr Knysh (1National Research Nuclear Universi
 ty MEPhI (Moscow Engineering Physics Institute)\, Moscow\, 115409 Russia 2
 Life Improvement by Future Technologies (LIFT) Center\, Moscow\, 121205 Ru
 ssia)\nPolymer Composite Scintillators Based on Halide Perovskite Nanocrys
 tals for X-Ray Imaging\n--------------------------------------------------
 ----------------------\n\n\nA. A. Knysh$^1$$^\,$$^2$\, P. M. Sokolov$^1$$^
 \,$$^2$\, V. V. Sosnovtsev$^1$\, P. S. Samokhvalov$^1$$^\,$$^2$\n\n$^1$Nat
 ional Research Nuclear University MEPhI (Moscow Engineering Physics Instit
 ute)\, Moscow\, 115409 Russia\n\n$^2$Life Improvement by Future Technologi
 es (LIFT) Center\, Moscow\, 121205 Russia\n\nThe performance of indirect X
 -ray imaging systems depends on the ability of a scintillator to efficient
 ly convert X-rays into visible light while preserving the spatial distribu
 tion of the transmitted radiation. High-resolution imaging therefore requi
 res efficient X-ray absorption and radioluminescence (RL) combined with th
 in\, optically homogeneous scintillation layers. Metal-halide perovskites 
 are promising for this purpose due to their strong X-ray absorption\, effi
 cient photoluminescence (PL)\, and compatibility with solution-based fabri
 cation [1]. In particular\, CsPbBr$_{3}$ perovskite nanocrystals (PNCs) ex
 hibit a high effective atomic number Z$_{eff}$ ≈ 63.2) and PL quantum yi
 elds approaching 100% [2]\, while their incorporation into polymer matrice
 s enables the fabrication of thin-film composite scintillators.\n\nIn this
  work\, thin-film scintillators based on CsPbBr$_{3}$ PNCs embedded in a m
 odified poly(methyl methacrylate) (PMMA) matrix were fabricated and tested
  for X-ray imaging. Films with thicknesses up to approximately 500 μm wer
 e found to be preferable for high-resolution imaging. A dedicated experime
 ntal setup was assembled in which the radiographic image was formed by the
  X-ray shadow of the investigated object projected onto the scintillator s
 urface and converted into visible emission. The image was recorded using a
  conventional digital camera (Canon EOS R6 Mark II)\, with an Apogee 5500 
 Series X-ray tube operated at 50 kV as the radiation source. Using a TYP 3
 9-A test pattern with 0.03-mm-thick lead lines\, a spatial resolution of a
 pproximately 8-9 lp/mm was achieved at an exposure time of 5-10 s.\nThe th
 ermal stability of both PL and RL intensities was also investigated. Only 
 a minor decrease in emission intensity relative to its initial value was o
 bserved after the heating-cooling cycle. Radioluminescence remained detect
 able even at 445 K\, while the relative decline of RL intensity was lower 
 than that of CsI:Tl\, BGO and GAGG:Mg\,Ce over the investigated temperatur
 e range. \n\nOverall\, the results demonstrate the potential of CsPbBr$_{3
 }$/polymer thin-film scintillators for high-resolution X-ray imaging using
  a simple optical readout scheme. \n\nKeywords: scintillators\, CsPbBr$_{3
 }$\, radioluminescence\, X-ray imaging\, spatial resolution. \n\nREFERENCE
 S\n\n1. Yang\, Z. et al. Designer Bright and Fast CsPbBr$_{3}$ Perovskite 
 Nanocrystal Scintillators for High-Speed X-Ray Imaging. Nat Commun 2024\, 
 15 (1)\, 8870.\n2. Knysh\, A. et al. Principles of Chemical Designing of S
 tyrene-Based Plastic Scintillators Doped with Quantum Dots. Phys. Atom. Nu
 clei 2024\, 87 (11)\, 1744–1749.\n\nhttps://indico.particle.mephi.ru/eve
 nt/626/contributions/6492/
LOCATION:Sevastopol hotel Conference Hall 1
URL:https://indico.particle.mephi.ru/event/626/contributions/6492/
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