the Geiger-Müller counter

A Geiger-Müller counter is a device used to detect and measure ionizing radiation, like radioactive particles. It contains a tube filled with a low-pressure gas and an electrode voltage. When radiation enters the tube, it ionizes the gas, causing a small electrical pulse. This pulse triggers a counter display or sound, indicating radiation presence. The device provides a quick, visible way to measure radioactive activity and is widely used for safety, environmental monitoring, and scientific research. Its design allows for sensitive detection of even low levels of radiation without complex equipment.