Definition
A Geiger counter is an instrument used to detect and measure ionizing radiation. It works by detecting the ionization produced when radiation passes through a gas-filled tube. Each ionizing event creates an electrical pulse that can be counted, giving a measure of the radiation intensity. Imagine it as a radiation detector, like a metal detector for radioactive particles. It's often used in environments where radiation exposure is a concern, such as nuclear facilities or after a nuclear incident. The device alerts users to the presence and level of radiation, allowing for appropriate safety measures to be taken. So, the Geiger counter is vital for safety in radiological settings.