| 摘要 |
In a radiation detector: a CsI:Tl (or CsI:Na) scintillator receives a number X of radiation quantums for each pixel, and emits a number L of photons constituting fluorescent light in response to each radiation quantum; photoelectric converters containing Si (or Se) as a main component are arranged corresponding to respective pixels to receive the fluorescent light with an entrance efficiency T, and generate charges when the fluorescent light is detected; and a capacitor is connected to each photoelectric converter, and stores the charges generated by the photoelectric converter. When the radiation detector receives a 10 to 300 mR dose of the radiation, the numbers X and L, the entrance efficiency T, the fill factor F and the photoelectric conversion efficiency eta of each photoelectric converter, and the maximum storable charge amount Q of the capacitor satisfy a relationship X.L.T.F.eta<=Q.
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