Location and identification of radioactive material with the GRETA (Gamma-Ray Experimental Telescope Assembly)

We previously reported Compton imaging measurements of
¹³⁷
Cs and
⁶⁰
Co laboratory sources using the full 15-channel readout of the Gamma-Ray Experimental Telescope Assembly (GRETA). We have since modified the detector geometry to accommodate a wider range of Compton scattering angles and implemented a neural networking method for the location of interaction positions with a 3-cm resolution inside the detector volumes. This paper describes the implementation of the neural networking method and culminates in the imaging of
¹³⁷
Cs,
⁶⁰
Co, and
²⁵²
Cf sources using this technique.