Can someone explain the concept of energy resolution to me, especially in gamma cameras. Thanks.
Generally speaking, energy resolution refers to the degree of monochromaticity. So if we say the particles have an energy say e, actually they are not all the same energy rather they are spread in a gaussian distribution around e with e representing the mean. The smaller the sigma of the distribution, the higher the energy resolution and the bigger the sigma the lower the energy resolution. % FWHM (~2.35σ ) is often used instead of sigma to represent the resolution especially since the distribution is not always gaussian but can be lorentzian or a mixture.
It is related to gamma ray imaging.