Passage of Fast Electrons through Matter

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WHEN a fast electron passes through matter, it loses its energy mainly by emission of a few large quanta of radiation (Bremsstrahlung). The radiation quanta are absorbed again, the absorption being due mainly to the creation of pairs. Thus, in a thick sheet of matter, a fast primary electron produces quite a number of secondary positive and negative electrons, which appear as a small shower giving rise to triple coincidences, etc.

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  1. 1

    Bethe and Heitler, Proc. Roy. Soc., A, 146, 83 (1934).

  2. 2

    Int. Conf. Nuclear Physics, London, 1934.

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