Housed in a robust casing this self-contained sensor detects radiation from Alpha, Beta and Gamma particles.

The Geiger Muller sensor is very simple to use, as it does not require an external power source, deriving its power from the datalogger unit.


0 to 500 counts per sec
0 to 5,000 counts per 10 sec
0 to 10,000 counts per min
0 to 65,535 open count
0 to 100% pulse output


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  • Half life Random events

Environmental Science-

  • Radioactivity exposure due to natural radon


Range 1:

  • Counts per second: 0 – 10,000 cps
  • Resolution: 1 cps​

Range 2:

  • Accumulative count with zero reset: 0 – 65,535 count
  • Resolution: 1 count

Range 3:

  • Pulse Output 10 – 100%

The Geiger Muller Counter is supplied with a steel rod for fixing to a clamp (ring) stand. It is equipped with a built-in GM tube and integral high tension power supply.

A yellow LED power indicator shows that an operating voltage is supplied to the Counter, and a buzzer that emits an audible signal for each radioactive pulse that is recorded. The GM tube’s window is made of a very thin and delicate material, which is easily destroyed. For this reason it has been equipped with a protective cap that may be left on except when measuring Alpha radiation.

Technical specification for the GM Tube window:

  • Thickness: 1.5 to 2.0 mg/cm2
  • Useful diameter: 9.14mm
  • Material: Mica
  • Gas filling: Neon, Argon, and Halogen

Use the Counts per second range for investigations to determine half life and absorption of radiation by different materials.

Use Open Count for recording background count. Pressing the button on the sensor housing starts the count. Pressing the button again, hold for a second and release, resets the count to zero.

Pulse Output: Each radioactive particle will generate one voltage pulse. The occurrence of the pulse is recorded to show the randomness of atomic decay. This range requires fast data capture.

Measurement procedure: Radioactive sources used in schools are usually weak, but care must be taken in handling them. An authorised person must be in attendance. Ensure all local rules and recommendations made in any relevant Safety Data Sheets are complied with. Prepare a risk assessment before the experiment or activity is carried out.

Works with the following Dataloggers:

VHub4 and VHub8


Geiger Muller

  • 0 to 10,000 counts per sec
  • 0 to 65,535 accum count
  • 0 to 100% pulse output