| 摘要 |
A detecting board (22) is provided with a wiring board (24), a semiconductor detecting element (25) firmly fixed on the upper plane of the wiring board (24) for detecting radiation and a spacer (28) firmly fixed on the upper plane of the wiring board (24), and a plurality of detecting boards are stacked and fixed. On each of the detecting boards (22), the semiconductor detecting element (25) and the spacer (28) are arranged to have a prescribed positional relationship. Furthermore, the detecting boards (22) are stacked by being aligned by the spacers (28) on an X-Y plane, and are fixed by fixing members (23a, 23b). The spacer (28) is provided with a step section (28e) so that the lower plane of the wiring board (24) is not brought into contact with the spacer (28) under the lower plane, and in the vertical direction, the spacers (28) are positioned by being brought into contact with each other. |
