| 摘要 |
A scintillator element 2 has a rod-like base material 11, and a scintillator 12 is formed by being vapor deposited radially onto a side face of the base material 11. A plurality of these scintillator elements 2 are aligned and bundled together to form a scintillator unit 1. By mounting a solid-state image pickup element 20 to an open face of a case 3 of the scintillator unit 1, an image sensor M, which serves as a radiation detector, is formed. The image sensor M can be adjusted in size by adjusting the number, etc., of the scintillator elements 2.
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