So we are doing Radioactivity lab at second year undergraduate. I am confused about the workings of the silicon radiation detects we are using even though the demonstrators tried to explain. We are detecting beta and gamma radiations by placing sources above a silicon detector that have a small area exposed. According to the demonstrators, the detected signal represents all the energy deposited by the radiation. But wouldn't some energy go into the kinetic energies of the conducting electrons which would not be picked up as voltage? Also, we see layers of discharge curves on the oscilloscope, how does the discharge work? They seem to have the same spread/period, are they timed? If it's just capacitor with same threshold, shouldn't all discharge occur at the same voltage?