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The multiplicative process in semiconductor radiation detectors. A practical application of Good's theorem in the theory of branching processes

Published online by Cambridge University Press:  24 October 2008

Iwao Ogawa
Affiliation:
Department of Physics, Rikkyo University, Toshima-Ku, Tokyo, Japan
Masao Furukawa
Affiliation:
Department of Physics, Rikkyo University, Toshima-Ku, Tokyo, Japan

Abstract

The electron avalanche that takes place within an internally amplifying semiconductor radiation detector has been analysed statistically, treating the process as an example of multi-dimensional branching processes. By extending the result obtained from Good's theorem to the case of continuous variable, an integral equation is derived for the generating function of the probability that a single primary electron-hole pair, formed at a depth x, induces an avalanche consisting of n pairs. On the basis of this equation, expressions are deduced for the mean value and the standard deviation σ of the total number n of pairs in an avalanche induced by n0 primary pairs produced at x, as well as the probability w(x, n0, n) of getting an avalanche of ‘size’ n. In particular cases these expressions lead to various simple relations of practical importance.

Type
Research Article
Copyright
Copyright © Cambridge Philosophical Society 1968

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