A Geiger Tube is a device that detects ionizing radiation. It's also known as a Geiger-Muller tube or a gas-filled detector. The tube contains gas, usually helium or neon, which becomes ionized when exposed to radiation. This ionization produces an electric signal that can be detected and measured. Other synonyms for Geiger Tube include radiation detector, radiation meter, and dosimeter. Some other related terms include Geiger counter, scintillation detector, and thermal-ionization mass spectrometry. These devices are used in many fields, from nuclear power plants and medical imaging to environmental monitoring and scientific research. They play an important role in keeping people safe and preventing exposure to dangerous levels of radiation.