Neutron imaging device using position-sensitive photomultipliers

A historical survey of the technical development on neutron imaging devices using the position-sensitive photomultiplier technique is given on the basis of works conducted by several collaborations in Europe as well as in Japan since 1986. Two different methods are compared: the first one based on the direct coupling of scintillator to the photocathode, and the second by using wavelength-shifting fibres for transfer of light signals from scintillator to the photocathode. Some perspectives for future developments are also discussed taking into account these experimental results.