X-ray CCD calibration system using fluorescent lines

We have developed a CCD calibration system using #uorescent X-ray lines with energies ranging from 1.49 keV (Al Ka) to 11.2 keV (Se Ka). The absolute X-ray #ux is calibrated by a gas proportional counter, while the emerging spectra are monitored by solid-state silicon detectors. In order to suppress contaminating X-rays in the #uorescence spectra, mechanical collimators were set in the X-ray beam line, high-purity targets for #uorescent lines were used, and band-pass "lters were put on the X-ray beam line. As for the purity of the #uorescent X-rays, the typical purity achieved was &98%. ( 2000 Elsevier Science B.V. All rights reserved.