1. A device for imaging a source of particles comprising: a particle track detector for recording images of detectable signals generated along particle tracks in an active material, wherein said detectable signals are generated by an interaction of a particle from said source with said active material, wherein said particle comprises a beta particle, alpha particle, a positron or a conversion electron; and a processor positioned in data communication with said particle track detector, wherein said processor is configured for: analyzing a plurality of images of detectable signals generated along particle tracks of a plurality of particles in an active material to determine attributes of said plurality particle tracks; and reconstructing a 3D image of said source of particles using attributes corresponding to all of said plurality of particles, wherein said attributes comprise one or more of a position of a start of a particle track, a direction of travel of a particle at a start of a particle track, and a total energy deposited by a particle along particle track.