Scalable Directional Radiation Detection

Radiation detector systems are disclosed that include scintillating optical fibers arraigned in a bundle, the bundle having a first end and a second end. The scintillating optical fibers are arraigned to receive incident radiation associated with a radiation source, emit photons in response to the incident radiation, and transport the photons to a first end and a second end of a respective one of the plurality of scintillating optical fibers. The radiation detector systems further include an asynchronous detector array positioned relative to one of the first end or second end of the bundle to detect the photons. The radiation detector systems further includes direction circuitry configurable to calculate a direction of the radiation source relative to the radiation detector system based at least in part on the direction of travel of an electron or other charged particle associated with the incident radiation source.