The study of the neutron response and n-γ discrimination for small 18x26x8mm 3 liquid scintillator BC501A (Bicron) detector was carried out by digital charge comparison method. Three ranges of neutron energies were used: uniform distribution from 0.95-1.23MeV, continuous spectra of AmBe source and monoenergetic 16.2MeV neutrons. The obtained results are compared with those of cylindrical liquid scintillation detector (40mm diameter, 60mm length) at the same energies of neutrons. A dramatic fall of the neutron response function at 400keV e e for small detector at 16.2MeV neutron energy was measured. For 0.95-1.23MeV neutron energy range such fall takes place at 260keV e e . The greater slope of neutron locus at 0.95-1.23MeV neutron energy compared to 16.2MeV for both detectors is explained by longer tail of pulse from proton recoils within 0.1-1.23MeV energy range.