Patent Number: 
Section: claims

1. A manufacturing method of a radiation detecting element comprising:bonding, by solid state diffusion, a substrate transparent to visible light and a fluorescent screen that emits fluorescence in response to radiation by a dopant added to a material that is the same as a material of the substrate; andthinning the fluorescent screen, whereinthe bonding includes applying pressure to the substrate and the fluorescent screen. 2. The manufacturing method according to claim 1, wherein, the bonding includes applying pressure to the substrate and the fluorescent screen in the bonding directions of the substrate and the fluorescent screen. 3. The manufacturing method according to claim 1, wherein the thinning includes polishing the fluorescent screen. 4. The manufacturing method according to claim 1, wherein the bonding is performed after a bonding surface of the substrate is superposed on a bonding surface of the fluorescent screen.