I saw some pre-amplifier specifications and all of them say noise in terms of energy ( for example 2.8 keV for Si). If I convert this energy to charge (4eV per e-h pair in silicon) and convert the charge to average current taking an integration time of 10 us, it turns out to be around 11 pA.
Does that mean the minimum signal current that the preamplifier detects and then integrates is 11 pA?
Saad Ouichaoui
The limit current value outcoming from your (correct) estimation seems to me too low and would be drowned within the background. According to usual nuclear electronics experiments, it should be of the nA order of magnitude.
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