Abstract The Total Energy Weighting technique has been applied to measure fast neutron capture in small separated stable isotope samples at the Oak Ridge Electron Linear Accelerator (ORELA). Nonhydrogenous liquid scintillators provide low backgrounds below about 2 MeV neutron energy with time resolution better than 2 ns and gamma cascade efficiency typically 15% per neutron captured. The 40 m flight path permits neutron energy resolution ranging from E n/600 at several keV (moderator thickness limited) to about E n/400 at 2 MeV. On line data processing via multiple access computer allows (disc) storage to reduced from over 4 × 10 6 channels to ≈ 190 000. The usual corrections for sample thickness, purity, deadtime, and a transformation to capture cross section vs neutron energy are accomplished off-line in a larger digital computer.