2. Many of the results were obtained by using Infinite rather than semi-Infinite geom etries. This was done either to simplify the measurement or to facilitate compari son with Spencer's early calculations. In any case, the semi-infinite geometry is of more practice! importance, 3. In the caae of semi-Infinite geometries, there are very little data for electron energies leas than 1.0 MeV for nonnormal incidence, and for multlalab media, 4. Spatial resolution near the surface of aemi-Infinite geometries Is poor, especially for hlgh-atomic-numbcr media. 0,3 a.4 as a* FRACTION OF A ftCAIf RANGE Figure 1.1, Comparison of Experimental Measurements and Theoretical Predictions of Energy Deposition Profiles in Seml-Infinlte Aluminum by Normally Incident 0. 5-MeV Electrons

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