Abstract
The full-energy peak efficiency of a Si(Li) detector has been experimentally determined over the photon energy range 3–26 keV for use in accurate ion-induced X-ray cross-section measurements. The efficiency uncertainties are ± 2% to ± 4% for 4.5–9.9 keV photons — the energy region of primary interest in the present work. The techniques utilised are described in detail since it was found that the use of absolute theoretical efficiencies can lead to errors in excess of 30% over the whole efficiency curve with even greater errors appearing below about 3 keV. Recent electron-capture data are used to calculate the yield of 3.1 keV Ag L X-ray from the decay of a calibrated 109Cd source in order to extend the efficiency curve down to 3 keV. The use of fluorescence sources as a novel way of accurately measuring efficiencies in the photon energy region 1–4 keV is outlined.
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