The Radial Gamma Ray Spectrometers (RGRS) system is been designed at a conceptual level for alpha particle and runaway electron measurements at ITER and is here described. The system benefits from the most recent advances on gamma-ray spectrometry for tokamak plasmas and combines space and high energy resolution in a single device. We find that RGRS as designed can provide information on α particles on a time scale of 1/10 of the slowing down time for the ITER 500 MW full power DT scenario. In case of disruptions with a typical duration of 100 ms, a time resolution of at least 10 ms for runaway electron studies can be achieved depending on the scenario at the different mitigation levels and beam currents we have simulated.

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