Describe how radiation can be detected

Using a Geiger muller tube the gm tube is a hollow cylinder filled with gas at low pressure. the tube has a thin window made of Mica at one end. There is a central electrode inside the GM tube. A high-voltage supply is connected across the casing of the tube and the central electrode. When the alpha, beta or gamma radiation enters the tube it produces ions in the gas, the ions created enable the tube to conduct. A current is produced in the tube for a short time, producing a voltage pulse. Each voltage pulse corresponds to one ionising radiation entering the GM Tube. The voltage pulse is amplified and counted