Optimization of phosphor concentration of surface‐modified Bi2O3 nanoparticle‐loaded plastic scintillators for high‐energy photon detection

Magi, Arisa; Koshimizu, Masanori; Watanabe, Akito; Yoko, Akira; Seong, Gimyeong; Tomai, Takaaki; Adschiri, Tadafumi; Haruki, Rie; Nishikido, Fumihiko; Kishiomto, Shunji; Fujimoto, Yutaka; Asai, Keisuke

doi:10.1007/s10854-021-05522-4

Cited by 11 publications

(6 citation statements)

References 30 publications

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“…Non-emissive nanoparticles have been loaded mainly for sensitization. With the aim of enhancing the detection efficiency of X-rays and gamma rays, ZrO 2 , 117,118) Bi 2 O 3 , 119,120) Gd 2 O 3 , 121) YbF 3 , 122) or HfO 2 [123][124][125] have been loaded in plastic scintillators. Bi 2 O 3 nanoparticles of less than 10 nm have successfully been synthesized for loading via subcritical hydrothermal synthesis.…”

Section: Plastic Scintillators Loaded With Nano-or Microparticlesmentioning

confidence: 99%

Recent progress of organic scintillators

Koshimizu¹

2022

Jpn. J. Appl. Phys.

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Recent development of organic scintillators is reviewed from the viewpoint of materials science. Design and crystal growth of organic crystalline scintillators, use of novel solvents and solutes in liquid scintillators, and development of plastic scintillators based on novel polymer hosts or novel fluorescent molecules are introduced. Additionally, development of loaded liquid or plastic scintillators is reviewed on the basis of two approaches of loading: molecules or nanoparticles. A disadvantage of organic scintillators has been their low scintillation light yields. Hence, materials design for improving scintillation light yields is introduced in detail with description on related excited state dynamics. Finally, future prospect for the improvement of scintillation light yield is briefly given.

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Section: Plastic Scintillators Loaded With Nano-or Microparticlesmentioning

confidence: 99%

Recent progress of organic scintillators

Koshimizu¹

2022

Jpn. J. Appl. Phys.

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“…Unfortunately, the scintillation light yield was reduced by QD loading possibly because of the self-absorption of the emission by the QDs, even lower than those with non-emissive nanoparticles such as HfO 2 19) or Bi 2 O 3 . 23) If the perovskite QDs were loaded in a low concentration so that the self-absorption can be negligible, the QDs would function as a wavelength shifter, i.e. they would absorb the emission of b-PBD and subsequently exhibit emit photons at a wavelength longer than that of b-PBD.…”

Section: Samplesmentioning

confidence: 99%

“…In contrast to organometallic compounds, which quench the excited states around them by transferring the excitation energy to the quenchers, a fraction of the ionizing radiation energy deposited on the nanoparticles reduces the scintillation light yield. Nanoparticles of heavy metal oxides, such as ZrO 2 , 16,17) HfO 2 or Hf-containing oxides, [18][19][20][21] Bi 2 O 3 , 22,23) and Gd 2 O 3 24) have been loaded in plastic scintillators.…”

Section: Introductionmentioning

confidence: 99%

Development of plastic scintillators loaded with perovskite quantum dots

Magi

Koshimizu

Satô

et al. 2022

Jpn. J. Appl. Phys.

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We developed plastic scintillators loaded with perovskite quantum dots (QDs) to enhance the detection efficiency for high-energy photons such as X-rays and gamma rays. QDs with different emission wavelengths were loaded onto plastic scintillators at 5 wt%. The emission from the QDs only was observed in the radioluminescence spectra under X-ray irradiation. The photoluminescence decay behavior indicates that the absorption of the QD emission by the QDs themselves (self-absorption) results in long decay components, which were also observed in the scintillation decay. The detection efficiency for 67.4 keV X-rays was successfully enhanced by loading, although the scintillation light yield was reduced.

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“…The usage of nanoparticles in scintillators is divided into two categories: in one category, nanoparticles are included in scintillators (mainly in organic liquid or plastic scintillators) to enhance the interaction probability of the scintillators with high-energy photons (3,(19)(20)(21)(22)(23)(24) or to include the sample nuclei for neutron experiments. (25)(26)(27) The other category is the use of scintillators in the form of nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Development of Ce-doped Gd3Al5−yGayO12 Nanoparticle Scintillators

Koshimizu¹,

Fujimoto²,

Asai³

2023

Sensors and Materials

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We synthesized Ce-doped Gd 3 Al 5−y Ga y O 12 (GAGG) nanoparticle scintillators for obtaining efficient emission in living bodies upon X-ray irradiation from outside. To obtain a high photoluminescence quantum yield (QY), the chemical composition and synthesis conditions were optimized. The highest QY of 90%, which is higher than that of a commercially available Ce-doped GAGG single-crystal scintillator (87%), was achieved with the composition for Gd:Al:Ga = 3:3:2, a Ce concentration of 0.1 mol% relative to (Gd + Ce), aging at room temperature for 1 d, and a calcination temperature of 1300 °C. The size of the particles was 200-300 nm. A dominant emission band at around 550 nm was observed in the photoluminescence and X-ray-induced radioluminescence spectra and attributed to the 5d-4f transition of Ce 3+ . The high photoluminescence QY and appropriate size for applications in living bodies indicated that nanoparticle scintillators based on Ce-doped GAGG were successfully developed.

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Optimization of phosphor concentration of surface‐modified Bi2O3 nanoparticle‐loaded plastic scintillators for high‐energy photon detection

Cited by 11 publications

References 30 publications

Recent progress of organic scintillators

Recent progress of organic scintillators

Development of plastic scintillators loaded with perovskite quantum dots

Development of Ce-doped Gd3Al5−yGayO12 Nanoparticle Scintillators

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