Fig. 3: X-ray energy-resolved imaging.
From: Stable perovskite single-crystal X-ray imaging detectors with single-photon sensitivity
a, γ-ray single-photon counting. An event from 241Am radiation source (Eγ = 60 keV) was recorded with a MAPbI3 SC (thickness, 110 µm; 0 V bias). The black curve is a trace from the charge-integrating preamplifier, and the red curve is the corresponding trace from the shaping amplifier. b, Energy-resolved spectrum of 60 keV photons from a radioactive 241Am source. c, The imaged object is a rectangle comprising two complementary patterns: 5-mm-thick ETH letters made of Nd2O3 powder surrounded by a 2-mm-thick steel frame. d, Attenuation coefficients versus X-ray photon energy for Fe (black curve) and Nd2O3 (green curve) shown on top of an example of 50 kVp energy spectrum transmitted through the Nd part of the object recorded by the MAPbI3 SC detector. The spectrum was binned into low-energy (blue) and high-energy (red) channels, with a border that corresponds to the characteristic K line of Nd. e, Energy-resolved X-ray imaging of the object from c under 50 kVp X-ray irradiation with the MAPbI3 SC detector, where the colours denote the transmittance for the corresponding two energy channels from d. f, Transmittance of low-energy (blue) and high-energy (red) channels along the white dashed line in e.
