| 摘要 |
PROBLEM TO BE SOLVED: To reduce background from a sample holder, with an irradiation width of X-ray emitted on a sample surface kept constant regardless ofθaxis rotation. SOLUTION: X-ray 9 from an X-ray tube 1 is cast on a sample 3 with an expansionα, and the X-ray diffracted with the sample 3 converges on a detection slit 4, to be detected with a detector 5. A divergence slit 2 is allowed to rotate freely with a rotation mechanism 6, and a rotation controller 10 so controls that relationshipβ=θ, whereβis rotation angle of the divergence slit 2 andθis rotation angle of the sample 3 onθaxis placed on the center of a goniometer, is kept, thereby, irradiation width of X-ray on the sample surface is kept constant at always.
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