Energetic electromagnetic radiation finds frequent uses in science (e. g., for expe- riments in nuclear and elementary - particle physics), in technology (for materials testing), and in medicine (for medical X-rays). The most common method of genera- ting such radiation is via the process of "bremsstrahlung" (a German term coined by A. Sommerfeld, meaning "braking radiation") in which a beam of electrons is direc- ted into matter (e. g., a metal target), losing energy during its collisions with the atoms and releasing this energy in the form of emitted radiation. The character of such...