Optical property of CR-39 synthesized by doping with methylviologen-encapsulated SiO2 nanocapsules as a solid-state X-ray plate detector

•A CR-39 plate synthesized by doping with methylviologen-encapsulated SiO2 nanocapsules.•A fluorescence image was firstly observed using the X-ray-irradiated CR-39 plate.•The minimum dose was 0.1 Gy and the image intensity was proportion to the dose from 0.5 Gy to 3 Gy.•The fluorescence image was stabilized by adding an electron acceptor, methylviologen, into CR-39.

A CR-39 plate synthesized by doping with methylviologen-encapsulated SiO2 nanocapsules was firstly demonstrated as a solid-state X-ray (80 kV) detector for diagnostic examination without etching using an alkali solution. The X-ray-irradiated area was clearly observed as an emission image by exciting with a laser in FLA-9000. The maximum intensity was obtained using a 532 nm laser. The emission intensity at the X-ray-irradiated area increased linearly from 0.5 to 3 Gy with increasing thickness from 1 to 5 mm. In 15-nm-diameter silica nanocapsules and 4–5-mm-thick CR-39, the maximum intensity was observed by X-ray irradiation.