| 摘要 |
PROBLEM TO BE SOLVED: To provide a radiation detector excellent in both radiation absorbing efficiency and luminous efficiency. SOLUTION: A fluorescent element is constituted as a double-layer structure wherein fluorescent elements 1 excellent in luminous efficiency are formed on the radiation incidence side, and fluorescent elements 2 excellent in transparency and radiation absorbing efficiency are formed under the elements 1. A photodiode array substrate 3 is formed under the elements 2. The fluorescent elements 1 and the fluorescent elements 2 are arranged in an array type, and shielding material 4 is inserted between the neighboring elements.
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