measured energy / energy density invariance / net energy / velocity-based energy vs. / high-energy electrons / potential energy expression / average energy / kinetic energy / high-energy end / experimental energy measurements / re-computed average energy / relativistic energy / vs. energy / constant total energy density / energy measurements / energy loss / predicted and experimental energy loss / average energy determination / average disintegration energy / law yields / dot product / observed energy / energy density / final energy / high-energy / field energy / recomputed energy loss / predicted and measured energy / conservation law / relative-velocitydependent kinetic energy / predicted average energy / net energy density / relativistic energy expression / high-energy particles / relative-velocity-based energy / high-energy electron absorption / energy / energy expression / /