Energy compensated Geiger-Müller tubes

Geiger-Müller tubes are electronic components which enable an instrument to count alpha, beta and gamma radiation events.   They do this by converting some of the energy of the radiation event into charge and amplifying that charge using gas avalanche mutiplication so that a usefully large pulse is delivered to the measurement circuit for each radiation event detected.

The sensitivity of a bare Geiger-Muller tube is strongly related to the energy of the gamma radiation.  Energy  compensation using high atomic number materials can modify this for either ambient or equivalent dose measurements.  The principle of a flatter response from a  compensated device is illustrated in this figure.

Energy compensatedversions of the following tubes are available:

> General Purpose alpha, beta and gamma
  • Our baseline gas volume and mixtures

> High dose gamma
  •  Smaller volume for lower sensitivity to prevent overload in high flux

> Low dose gamma
  •  Larger volume for higher sensitivity in low radiation environments