  Novel NaIL detector (5x6 inch) was investigated for aims of neutron detection
in wide energy range. It has been found that the detector together with its
known ability to detect the {\gamma}- radiation is also allows to distinguish
neutron signals in three quasi-independent ways. It sensitive to neutron fluxes
on a level down to $10^{-3}$ $cm^{-2}$ $s^{-1}$. In the work intrinsic
{\alpha}- background and neutron detection efficiency for the NaIL detector
were obtained. Experimental data was compared with results of Geant4 Monte
Carlo (MC).
