DESIGN AND CONSTRUCTION OF A BERREMAN-TYPE POINT-FOCUSING X-RAY MONOCHROMATOR FOR USE IN LOW-ANGLE SCATTERING STUDIES
The design and construction of a point-focusing single quartz crystal x- ray monochromator for low-angle scattering are described. Monochromatization and point focusing of the copper K alpha /sub 1/ line are obtained by Bragg reflection from an appropriately bent 21/2 by 23/8 by 0.015 in. crystal lamina. With a 0.0225-in. aperture defining the size of the x-ray source next to a General Electric CA-7 diffraction tube running at 45 kv and 18 ma. about 3 x 10/ sup 9/ counts/min may be put into a 0.025-in. half-width focus, in helium atmosphere. Parasitic scattering from the crystal which competes with scattering from the sample was excluded by using a converging vane collimator, which required coating with lead chloride to prevent low-angle total reflection from the vanes. Sample-to-detector distances of up to 49 cm are obtainable. Keratin and albumin scattering patterns are shown to illustrate the instrument's performance. (BBB)
- Research Organization:
- California Inst. of Tech., Pasadena
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-18-016287
- OSTI ID:
- 4066717
- Journal Information:
- Journal of Ultrastructure Research (U.S.), Vol. Vol: 9; Other Information: Orig. Receipt Date: 31-DEC-64
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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