  GN-Vision is a novel dual $\gamma$-ray and neutron imaging system, which aims
at simultaneously obtaining information about the spatial origin of
$\gamma$-ray and neutron sources. The proposed device is based on two position
sensitive detection planes and exploits the Compton imaging technique for the
imaging of $\gamma$-rays. In addition, spatial distributions of slow- and
thermal-neutron sources ($<$100 eV) are reconstructed by using a passive
neutron pin-hole collimator attached to the first detection plane. The proposed
gamma-neutron imaging device could be of prime interest for nuclear safety and
security applications. The two main advantages of this imaging system are its
high efficiency and portability, making it well suited for nuclear applications
were compactness and real-time imaging is important. This work presents the
working principle and conceptual design of the GN-Vision system based on Monte
Carlo simulations and explores its simultaneous $\gamma$-ray and neutron
detection and imaging capabilities for a realistic case of a security
inspection where a $^{252}$Cf source is hidden in a neutron moderating
container.
