Toroidally Shaped Hopg Crystals as Strongly Focusing Bragg Reflectors of Characteristic X-Ray Tube Radiation for Edxrf Analysis
| Autor: | Burkhard Beckhoff, Birgit Kanngieβer, Walter Swoboda, Jens Scheer, J. Laursen |
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| Rok vydání: | 1993 |
| Předmět: | |
| Zdroj: | Advances in X-ray Analysis. 37:523-533 |
| ISSN: | 2631-3626 0376-0308 |
| DOI: | 10.1154/s0376030800016074 |
| Popis: | The characteristic 17.441 keV Mo-Kα tube line yields an exceedingly strong reflection at a Bragg angle of 6.0710 on Highly Oriented Pyrolytic Graphite (IIOPG). Using doubly bent toroidally shaped crystals we were able to concentrate the characteristic radiation from a Mo anode fine focus tube onto a small focal spot area of about 1 mm. FWHM diameter, as was observed by an X-Ray sensitive CCD. The radiation of the Mo anode fine focus tube is emitted at a take-off angle of 60 into a total solid angle with an aperture of 120. About 90 percent of this primary radiation solid angle can be used for the desired Bragg reflection on the designed toroidal crystal surface. This feature ensures the high beam intensity needed for special excitation problems. |
| Databáze: | OpenAIRE |
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