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 Berreman-type single quartz crystal X-ray monochromator for low-angle scattering is described. Monochromatization and point focusing of the copper K α 1 line are obtained by Bragg reflection from an appropriately bent 2½ by 2⅜ by 0.015 inch crystal lam...
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Published in | Journal of ultrastructure research Vol. 9; no. 5; pp. 419 - 444 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
United States
Elsevier B.V
01.12.1963
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Subjects | |
Online Access | Get full text |
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Summary: | The design and construction of a point-focusing Berreman-type single quartz crystal X-ray monochromator for low-angle scattering is described. Monochromatization and point focusing of the copper K
α
1 line are obtained by Bragg reflection from an appropriately bent 2½ by 2⅜ by 0.015 inch crystal lamina. With a 0.0225 inch 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 × 10
9 counts per minute may be put into a 0.025 inch 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. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0022-5320 1878-2345 |
DOI: | 10.1016/S0022-5320(63)80076-3 |