| 摘要 |
PURPOSE:To eliminate the need for positioning readjustment in parts replacement by previsouly adjusting the positions of an X-ray tube, a collimator, etc., and then making them into an assembly. CONSTITUTION:A measuring head 1 is fixed at a distance D from a plated steel plate 2. Then, X rays from an X-ray tube 3 reach an irradiation position A through a collimator 9 fitted to the window 8 of a metallic case 7, and the window 11 of a supporting plate 10 screwed into the case. Fluorescent X rays radiated from the irradiation position A enters an ion chamber 13 through a collimator 12 united with the supporting plate 10 and the intensity is detected by a detector 4. Then, the X-ray tube 3, collimators 9 and 12, etc., are made into one assembly 14, which is adjusted precisely before being fitted to a base 5. Therefore, the assembly 14 is replaced for parts replacement, thus eliminating the need for the position adjustment of parts. |
