Extended Data Fig. 2: Characterization of the NaLuF4:Tb@NaYF4-embedded optical fibre.
From: A swallowable X-ray dosimeter for the real-time monitoring of radiotherapy
a, Radioluminescence and afterglow photographs of NaLuF4:Tb@NaYF4 (15 mol%) nanocrystals embedded in an optical fibre. X-ray operation was set to 50 kV, with tube currents of 80 μA (16.68 mGy/min) and 20 μA (4.17 mGy/min). b, Radioluminescence spectra of the fibre embedded with NaLuF4:Tb@NaYF4(15 mol%) nanocrystals of different doping concentrations. c, Decay curves of NaLuF4:Tb@NaYF4 (15 mol%) nanocrystals after exposure to various X-ray doses at room temperature. d, Radioluminescence intensity versus dose rate at different wavelengths. e, Comparison of radioluminescence of various X-ray scintillators after termination of X-ray irradiation (50 kV and 5 kV). f, Time-dependent X-ray luminescence intensity at various temperatures. g, Radioluminescence intensity of NaLuF4:Tb@NaYF4 nanocrystals when irradiated with X-rays at 2, 3 and 5 Hz.
