Handheld and backpack human portable radiation detection system launched by Smiths Detection. Symetrica is the technology partner for this project and provides the radiation detection and identification sub-system. The unit includes gamma, neutron and Geiger-Müller (GM) tube detectors, and can identifying highly enriched uranium, plutonium and other radioactive materials, even in very small quantities. Expertise in modelling gamma-ray detectors from Southampton University improved significantly through the participation in developing of the mass-model for the Integral spacecraft was used in the developing of the portable radiation detection system.