Spectra of D-T neutrons transmitted through different densities of concrete containing rare-earth oxides are measured using a neutron generator. The NE-213 Liquid Scintillation Spectrometer is used in these measurements. The count spectra have been unfolded using the code ‘DUST’. The experimental results are compared with the one dimensional transport code ‘ASFIT’ and also the Monte-Carlo code ‘MORSE-CG’. The computations agree reasonably well with the experimental measurements. The characteristic features of the transmitted neutron spectra are explained based on the available cross-section data.