Abstract
The efficiency of a windowless Si(Li) X-ray detector has been determined experimentally for photon energies down to 600 eV. Thin foil targets of Au, Ag, and Al were bombarded with 66.5 keV electrons, and the resulting atomic-field bremsstrahlung was measured with the detector. The shape of the detector's efficiency function was determined by comparing these measured distributions (away from characteristic X-ray lines) with calculated spectral distributions for the bremsstrahlung, which are accurate to within 11%. The efficiency determined with a calibrated radioactive source at 5.4 keV was used for absolute normalization of this curve. The overall uncertainty in final efficiency was 12–13%. The general applicability of the calibration technique at low photon energies, its limitations, and proposals for further refinement are discussed.
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