[en] The neutron spectrum in the FTR Engineering Mockup Critical has been measured at six locations using proton-recoil techniques. At three of these locations, multiple foil irradiations were also conducted. Two-dimensional diffusion theory calculations using 42 energy group ENDF/B-III cross section data were made and the spectra from these calculations were compared to the proton-recoil data and spectra inferred from analyses of the irradiated foils. In general, the diffusion theory results agree quite well with the proton-recoil results. Good agreement was also obtained using the multiple foil technique for in-core locations. However, low fluence levels led to unreliable multiple foil results for the shield location