The Mullard ZP1481 Geiger-Muller Tube is a halogen quenched metal tube with a thin end window. It is used for detecting alpha beta and gamma radiation and is recommended as a general purpose tube for use with radioactive sources in schools. A removable protective mesh cap of plastic is fitted over the window and the body has a thin plastic coating.Features:Sensitive to alpha beta and gamma radiationThreshold voltage: max. 400VPlateau length: min. 100VRecommended supply voltage: 450VOperating temperature: -40 to +75°CDead time (at 450V): 120µsAnode/cathode capacity: 3.5pFSensitivity for 1mR/L radium: 1650 counts min-1Window thickness: 2.5 - 3.0 mg cm-2Dimensions overall: 76mm x 26mm diameterLife expectancy at approx. 25°C: 5x10¹° countsThis Geiger-Muller tube must be used with the Geiger-Muller Tube Holder which is sold separately (B8H27155).