How to Use a Geiger counter to measure radioactivity

Radiation is invisible… but the Geiger Counter makes it impossible to miss. ⚡☢️ Every click you hear is a particle of radiation hitting the Geiger–Müller tube — ionizing the gas inside and creating a tiny electrical pulse. 🤯🔬 Inside that tube is a simple setup: a metal cylinder, a thin wire, and a cloud of inert gas under high voltage. But the moment radiation enters, it knocks electrons loose, setting off an ionization avalanche that the device turns into a sound, a flash, or a reading on the