  The aim of the present note is to derive a general formula for a detective
quantum efficiency (DQE) of a neutron image plate detector which includes all
essential parameters of the system. Relying on that formula, the effects of a
variety of processes involved in the formation of an output signal are
discussed and estimated. The theoretical value of the DQE is compared with the
experimental one measured for the commercial neutron image plate BAS-IP ND 2025
(FUJIFILM).
