[en] A ³He gas proportional counter is an ideal detector for thermal and epithermal neutron detection because of its high sensitivity. This kind of detector has been widely used in moderator-type neutron area monitors such as a Neutron Survey Meter or a Neutron Multisphere Spectrometer. The characteristics of two spherical ³He gas proportional counters with different gas pressures, have been determined in terms of their energy responses, their angular responses and their collimated beam responses. The results confirm that the ³He proportional counters have approximate 1/E_n^1/2 energy responses and isotropic responses. (Author)