Use the triple energy window method to calculate the scatter-free technetium-99m counts for a point in an image which has 10,000 total photopeak counts in a 20% energy window. 5% scatter windows are placed above and below the photopeak (centered at 120 kev and 160 kev) and contain 1000 counts and 100 counts respectively.

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.