Abstract
The effect of ageing is studied for self-quenching GM counters of differently combined electrode diameters. The results obtained show that: 1) the basic factor contributing to the ageing of a counter is the change of the anode surface area; 2) this change appears in the discharge zone and is developed in three consecutive stages; (a) appearance of a fine powder, (b) appearance of spikes and flakes, and (c) formation of granules situated almost evenly along the anode length. 3) The anode surface could be brought to a state corresponding to a given stage, either through a definite number of recorded pulses, or by a certain intensity of the field, i.e., the change is dependent on the momentum of the products attacking the anode. The investigations are carried out with the purpose of confirming the role of the anode found in our previous papers - this role is basic for the operation of the counter.
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