The Geiger-Muller detector, on the other hand, operates in avalanche mode, so the energy pulse measured by the detector is not proportional to the energy of the radioactive particle. Thus, the average current flow in the detector is a function of only the activity (curies) of the source. This detector is better at measuring the activity of the source, and can be more sensitive to lower energy particles, at the loss of discrimination of what those particles are.
http://wiki.answers.com/Q/What_are_the_differences_between_p...
Contorul Geiger-Muller face parte din categoria detectorilor de ionizare in gaz, ca si camera de ionizare si contorul proportional.
Acest detector are o constructie simpla, fiind alcatuit din doi electrozi introdusi intr-un tub de sticla sau de metal. Tubul contine si un gaz nobil la presiune joasa ( zeci de torri).
http://www.free-referate.ro/referat-Contorul-Geiger-Muller-6...

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Note added at 1 hr (2010-05-10 11:47:52 GMT)
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Din neatenţie, am marcat un alt fragment decât cel inteţionat! Revin:
The proportional counter is operating in linear mode, so the energy pulse measured by the detector is proportional to the energy of the radioactive particle. Thus, the average current flow in the detector is a function of both the activity (curies) and the energy (kEv) of the source. This detector is better at measuring the dose rate of the source.
http://wiki.answers.com/Q/What_are_the_differences_between_p...