The present invention is an electronically collimated gamma radiation detector apparatus including a radiation sensor coupled to a digitizer, which is coupled to a processor. The apparatus receives an analog signal waveform from the sensor and transmits it to the digitizer, for transformation to a digital pulse waveform. This waveform is transmitted to the processor, which calculates at least one pulse shape parameter of the waveform, instantiates a pulse data object, and populates the object with a pulse identifier, a vector parameter, and the pulse shape parameter. The above steps are repeated at a different vector to obtain multiple objects. The processor compares pulse shape parameters from different objects using a comparison method. The comparison method updates each object with a longitudinal, transverse, or angled directional parameter. The processor can output vector parameters associated longitudinal parameters, output objects with a desired vector parameter, or conduct further analysis on objects.