Quick Answer: Geiger-Muller Tube is a halogen quenched metal tube with a thin end window for detecting alpha, beta and gamma radiation, recommended as a general purpose tube for use with radioactive sources.
Last updated: October 2026
Key Features
Halogen quenched metal tube with a thin end window
Detects alpha, beta and gamma radiation
Removable plastic mesh cap over the window; body has a thin plastic coating
Recommended supply voltage 450 V, threshold voltage maximum 400 V
Must be used with the Geiger-Muller Tube Holder
Technical Specifications
Specification
Value
Radiation detected
Alpha, beta and gamma
Recommended supply voltage
450 V
Threshold voltage
Maximum 400 V
Plateau length
100 V
Dead time (at 450 V)
120 µs
Anode/cathode capacity
3.5 pF
Window thickness
2.5 - 3.0 mg cm-2
Operating temperature
-40 to +75 °C
Overall dimensions
76 mm x 26 mm diameter
About This Product
As a general purpose detector, the tube is intended for radioactivity work with radioactive sources and must be fitted in the Geiger-Muller Tube Holder. A removable plastic mesh cap covers the thin end window, and the metal body has a thin plastic coating.
Frequently Asked Questions
Q1. What is the dead time of the tube? The dead time is 120 µs at 450 V.
Q2. Does the tube need a holder? Yes. It must be used with the Geiger-Muller Tube Holder.
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