Discussion
A gas filled G.M. counter cannot be used to measure energy of radiation because :
Answer: D
A G.M. counter cannot measure energy because all the atoms of the gas are ionised irrespective of the energy of the incident radiation.
In the Geiger region the applied voltage is so high that any initial ionisation, however small, triggers an avalanche that spreads along the whole anode wire until it is stopped by the space charge. Every pulse therefore has nearly the same size, so the pulse carries no information about the energy deposited.
Recombination happens in the low-voltage region, not the Geiger region; window losses affect only weak radiations; and partial ionisation is what happens in proportional counters, which can measure energy.
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