Figure 9
(a) The response characteristic measured with different PMT voltages using an X-ray beam of 12 keV. The dN/dV derivative as a function of PH (inserted plot) illustrates the systematic shift of the peak position (PHPK) with bias voltage as shown by the arrows. (b) The linear relationship between PHPK and peak width (FWHM) obtained at various energies (main graph). The integration of N, observed at operational bias voltages (insert plot), shows `uniformity' response of the DELT-X device. |