A Gas Electron Multiplier (GEM) is a type of gas detector used in particle physics and radiation detection. It is designed to amplify the ionization created by charged particles interacting with a gas medium. Here's how it works and its key features: ### Structure and Function 1. **Design**: A GEM consists of a thin plastic or metallic foil with holes (microholes) that are typically a few tens of micrometers in diameter.
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