Radioisotope (60Co) and particle accelerator (10 s MeV proton) sources are both commonly used to assess the effects of the space radiation environment on electronics and detectors; however, the efficiency of 60Co gammas to generate displacement damage is poorly understood. Here, 60Co and 54.3 MeV proton degradation of the minority carrier lifetime are compared for an InAs/InAsSb superlattice and bulk InAsSb semiconductor infrared detector materials to assess the extent to which 60Co gammas gener