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Consider an electron drifting in a gas toward a collection electrode. Acommon misconception is that the electron produces a detectable signal onlyupon arrival at the electrode. In fact, the situation is quite the opposite.The electron induces a detectable current in the electrode as soon as it startsmoving through the gas. This induced current vanishes when the electron arrivesat the plate. To illustrate this phenomenon experimentally, we use a gas-filledparallel plate ionization chamber and a collimated $^{241}$Am alpha source,which produces a track of a fixed number of ionization electrons at a constantdistance from the collection electrode. We find that the detected signal fromthe ionization chamber grows with the electron drift distance, as predicted bythe model of charge induction, and in conflict with the idea that electrons aredetectable upon arrival at the collection plate.

Understanding Current Signals Induced by Drifting Electrons