The first portable active interrogation system for special nuclear materials (SNM), such as U-235 and Pu-239, is being
developed by our group. The system employs an inertial electrostatic confinement (IEC) device as a neutron source. The
first prototype of the IEC device, with 17 cm chamber diameter (IEC17), has been fabricated, assembled and is being
tested. Preliminary results from the first portable chamber will be presented in this paper.