I observed different values of global count rates for different XRD machines. For ex in Bruker XRD machine it is 1.5 Mcps. How should we choose the machine depending on their global count rates ?
i think the count rate is just how much signal the detector is receiving.
this would change from sample to sample and also the structure of your sample.
Thank you Dr Gudla. It means the machine having higher global count rate must be preferable, since our sample is same for all the cases. Hence we will have higher intensity counts in the machine with high global count rate.
The global count rate is not a big issue for collecting diffraction data. The more important value is the signal-to-noise ratio, which depends on your detector, sample and X-ray source. If you have a noisy detector a high global count rate doesn't help that much.
The term most likely refers to how the detector/sensor behaves as the total number of photons/second impinge on it and are handled by the electronics behind it. Beyond the maximum rate of say >10^9/sec, for example, one would expect pulse overlap and saturation to set in.
I am agree with Prof Elton Kaufmann reply. High Global count rate machine should be preferred to carryout different X-ray experiments viz. High-resolution work (Detector and Geometry dependent), Standing wave exp (Geometry, high intensity source), T-XRF, Single crystal diffraction etc.
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