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The Raether limit is the physical limiting value of the multiplication factor (M) or gas gain in an ionization avalanche process (Townsend avalanche). Even though, theoretically, it seems as if M can increase without limit (exponentially), physically, it is limited to about M < 108 or αx < 20 (where α is the first Townsend coefficient and x is the length of the path of ionization, starting from the point of the primary ionization. The multiplication factor or gas gain is of fundamental importance for the development of proportional counters.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Raether_limit". A list of authors is available in Wikipedia.|