A Geiger Müller counter detects ionizing radiation through a gas-filled tube. When radiation enters the tube, it ionizes the gas, creating an electrical charge that is then measured. This process allows for the detection of various types of radiation, including alpha particles, beta particles, and gamma rays. The counter provides a reading in counts per minute (CPM) or microsieverts per hour (µSv/h), which indicates the level of radiation present.
