Numerical model of graphene-based radiation detector response

Graphene-based radiation detectors (GRDs) have a potential to provide new and improved capabilities when compared to more conventional detectors. The unique electrical properties of graphene can result in a GRD response that resembles that of a transition edge sensor. We have modeled the interaction of gamma rays with a variety of GRD absorber materials using GEANT4. The transport of the charge carriers through the detector is then modeled using an electric field calculated by the COMSOL multiphysics model. During the drift of the electrons to the graphene, the Shockley-Ramo theorem is used to calculate the time-resolved detector response. We present the calculation of the expected time-resolved signal from a gamma ray interaction. Additionally, we present a preliminary analysis of expected energy resolution and noise analysis for GRDs.