Fig. 7: X-ray imaging studies.

a Scheme of the production and composition of the X-ray scintillator screen (CMC-Na is abbreviated from carboxymethylcellulose sodium; HNTs@Na5Lu9F32:Tb3+ is abbreviated from Tb3+-doped Na5Lu9F32 anchored halloysite nanotubes). b Photograph of the as-prepared X-ray scintillator screen (Thickness: ca.1 mm; bar: 2 cm). c Fabrication of the spring-containing capsule model (bar: 1 cm). d Schematic diagram of the X-ray imaging system based on the as-prepared X-ray scintillator screen. e The image relating to the capsule model taken from the digital camera (X-ray: 30 kV, 20 mA; Power: 600 W; bar: 2 mm).