The Townsend avalanche can have a large range of current densities.
2.
The resulting ions and electrons are accelerated by the electric field across the chamber, causing a localised cascade of ionization known as a Townsend avalanche.
3.
The underlying process is the Townsend avalanche, where collisions between electrons and neutral gas atoms create more ions and electrons ( as can be seen in the figure on the right ).
4.
The " first Townsend coefficient " ( ? ), also known as " first Townsend avalanche coefficient " is a term used where secondary ionisation occurs because the primary ionisation electrons gain sufficient energy from the accelerating electric field, or from the original ionising particle.
5.
The Geiger M�ller tube and the proportional counter both use a phenomenon known as a Townsend avalanche to multiply the effect of the original ionizing event by means of a cascade effect whereby the free electrons are given sufficient energy by the electric field to release further electrons by ion impact.
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