Proposal for medical application beamlines of the spring-8

We, a user group for medical applications of the Spring-8, have proposed the introduction of white X-rays from insertion devices to BMIC (BioMedical Imaging Center) for clinical uses so that enough photon fluxes to a subject is guaranteed. The photon flux, depending on various monochromatizing methods, was compared at the surface of the subject 200 m from a light source. UNDULATOR LIGHT SOURCE: A. Double monochromator was installed in an optics hutch close to the undulator. B. Irradiation of white X-rays with 75 rad aperture to a metal target generates fluorescent monochromatic X-rays. C. An aperture of 2 microradian × 2 microradian was installed at the light source with a beam size of which at a target position will be 2 mm × 2 mm. WIGGLER LIGHT SOURCE: D. White X-rays were introduced to BMIC where monochromatization was performed with asymmetric reflection using chemically etched crystals. E. Crystal rubbed by carborundom with #1200 reflects asymmetrically monochromatic X-rays with energy band width of ΔE/E=0.01. RESULT The undulator light source B showed maximum flux, even though filtration of K-beta component decreases to 0.3 to 0.25 of K-alpha component. By conducting white X-rays from the wiggler light source to BMIC, the flux density at BMIC was estimated to be sufficient for clinical use.