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Figure 8
Predicted on-axis energy errors from a type II spectrometer constructed from eight stacked 200 µm-thick silicon photodiode arrays. While the predicted error first dips below 1% near 5.5 keV, the transmission efficiency at this energy is low (4 × 10−4). The transmission efficiency limits the measurement until 9 keV. The spectrometer then provides good measurements of energy up to 30 keV and should allow K-edge ambiguities to be resolved up to 60 keV. Curves show predicted energy errors observed by the second (filled squares), third (open squares), fourth (filled diamonds), fifth (open diamonds), sixth (filled circles), seventh (open circles) and eighth (crosses) detector in the stack. These correspond to the signal observed through 200, 400, 600, 800, 1000, 1200 and 1400 µm of silicon. Not shown is the first diode array in the stack which provides the I0 signal. Simulation corresponds to a detected signal consisting of 10000 X-rays. Note: simulations neglect the absorption of dopants, passivating layers and electrode materials.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 12| Part 5| August 2005| Pages 618-625
doi:10.1107/S0909049505022600
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