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Proceedings Paper

Novel, movable, multianode x-ray source for imaging detector calibrations
Author(s): Kenneth Glenn Tirsell; Mark Whitman Bowers; Allen J. Elsholz; John E. Randolph
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Paper Abstract

We have developed a moveable, multi-anode, electron-induced x-ray source for calibrating x-ray imaging detector systems. The source features four water-cooled, copper-based anodes that are easily replaced and interchangeable under vacuum. A spherically symmetric filament and anode configuration yields very symmetrical source spot sizes variable from 1 to 5 mm diam. The source is coupled to vacuum by means of a triple-axis translator with x and z motions computer controlled to better than +/- 13 micrometers step accuracy. Absolute source flux is continuously monitored with a proportional counter. We characterize the source spot in detail by aiming the anode towards a pin-hole imaging x-ray detector system. To date we have used Co, Fe, Mg, and Ge vapor-deposited on copper anodes. When filtered with Ni or Mg foils, these emitting materials provide sets of four moderately pure x-ray lines below 1.5 keV. High deposition purity as well as 1E-7 torr source chamber pressures help reduce source degradation. Source translation and data acquisition are computer controlled using a Macintosh/LabVIEW software system. We discuss the application of our source configuration to spatial calibrations of extended pinhole and slit imaging detector systems. In addition, our multi-anode capability is useful for calibrating x-ray spectrograph response versus wavelength.

Paper Details

Date Published: 3 February 1993
PDF: 11 pages
Proc. SPIE 1736, X-Ray Detector Physics and Applications, (3 February 1993); doi: 10.1117/12.140469
Show Author Affiliations
Kenneth Glenn Tirsell, Lawrence Livermore National Lab. (United States)
Mark Whitman Bowers, Lawrence Livermore National Lab. (United States)
Allen J. Elsholz, Lawrence Livermore National Lab. (United States)
John E. Randolph, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 1736:
X-Ray Detector Physics and Applications
Richard B. Hoover, Editor(s)

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