  We discuss various methods to obtain the resolution volume for neutron
scattering experiments, in order to perform absolute normalization on inelastic
magnetic neutron scattering data. Examples from previous experiments are given.
We also try to provide clear definitions of a number of physical quantities
which are commonly used to describe neutron magnetic scattering results,
including the dynamic spin correlation function and the imaginary part of the
dynamic susceptibility. Formulas that can be used for general purposes are
provided and the advantages of the different normalization processes are
discussed.
