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Short peaking times are used for high count rates and with Pile up rejection and you trade off resolution for count rate. A longer peaking time is used for low count rates for better resolution but with a slower acquisition time. When changing peaking time you need to also reset the slow and fast thresholds to optimize to your system or you’re still going to get low energy noise or missed counts ?That can be done manually or automatically in DppMCA. The DP5 system must also be set up with the actual specifications of the detector you are using so be sure to check that if it’s not a factory supplied DP5/SI-pin pair. That setting is in the DPPMCA. The gain setting is going to set the range of interest and to a certain point the resolution which is limited by the FWHM resolution of the detector itself. Over sampling will do nothing for resolution but will increase the acquisition time by a factor of 2 for each doubling of conversion gain. Even SDD detectors only use 2048 channels.? Running a high count rate with the wrong peaking time will cause pile up problems loss of resolution and energy shifts. Watch your dead time and the Total and Input count. They should be close to one another. If total count is too high you have too much low threshold noise and need to optimize the system again

Am sources need a long count time to see much of anything other than % level elements 10 - 20 counts isn’t a peak, it needs lots of counts and a Gaussian shape to see if its merged with other peaks, has a low energy tail, and to find the true centriod.

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