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Schematic of the plasmon-enhanced scintillation process. Ionising radiation deposits excite the solvent, and the excitation migrates to the primary and secondary fluorophores. The large optical absorption cross section of the plasmonic nanoparticle ensures efficient excitation of the LSPR. The surface-bound fluorophore is resonantly coupled to the LSPR near-field, providing enhanced excitation.
The absorption and fluorescence spectra for several scintillation components. The secondary fluorophore POPOP emission spectrum is suitable for exciting the Ag-core, silica-shell NP. The 9-AA absorption spectrum allows resonant coupling to the near-field of the excited NPs. The NP absorption spectrum is narrow enough to not attenuate the 9-AA emission spectrum at longer wavelengths.
The fluorescence emission intensity of plasmonic nanoparticle surface-bound 9-AA (solid trace) relative to a free 9-AA control (dashed trace).
The normalized fluorescence spectra associated with the 9-aminoacridine-coated plasmonic nanoparticles in water (dashed trace) and emulsified in the scintillation cocktail (solid trace).
The scintillation count rate enhancement of 9-AA coated plasmonic nanoparticles relative to a free 9-AA and nanoparticle control, as a function of 9-AA concentration during fabrication. An external 241Am source was used for excitation.
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