The energy distribution of particles in an irradiated system-the degradation spectrum-is perhaps the most fundamental piece of information in a description of the radiation field acting on the system. We discuss recent progress in the calculation of electron degradation spectra as well as some systematics of electron degradation spectra and compare this method with other viewpoints, e.g., CSDA, Monte Carlo, and Fowler-equation calculations. Deficiencies in the available data as well as prospects for further calculations will also be discussed.

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