In this study, the activation cross sections were measured for Nd-142(n,alpha)Ce-139m reaction at four neutron energies between 13.57 and 14.83 MeV, which were produced by a neutron generator through H-3(H-2,n)(4) He reaction. The production of short-lived activity and the spectra accumulation were performed by the cyclic activation technique. Induced gamma-ray activities were measured using a high resolution gamma ray spectrometer equipped with a high-purity Germanium (HpGe) detector. In the cross section measurements, corrections were made regarding the effects of the gamma-ray attenuation, the dead-time, the fluctuation of the neutron flux, and low energy neutrons. The measured cross sections were compared with the published literature and the results of the model calculation (TALYS 1.4). (C) 2014 Elsevier Ltd. All rights reserved.