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Cyclotron radiation emission spectroscopy (CRES) is a method of measuring the kinetic energy (KE) of beta particles (e.g., electrons) such as from beta decay. As particles pass through a uniform magnetic field, the resulting frequency is measured. The technique is the basis of the Project 8 experiment in neutrino mass measurement: determining the beta particle's energy helps account for the amount of energy available for the neutrino's mass. To carry this out, the radioactive material is held in gas form, contained within the magnetic field, so the cyclotron radiation commences immediately after the decay. The data collected requires considerable analysis to yield the KE.