Today, the certification process for onboard electro-electronic systems against nonionizing radiation can be considered mature and independent, having its own set of requirements. In turn, the current proposal for this process with regard to ionizing radiation is relatively recent and is in the process of improvement and discussion by industry and regulatory bodies, and presents important differences in approach. In this work these two processes are presented comparatively in detail, pointing out similarities and differences in order to contribute to this ongoing discussion, which should, in the medium term, result in regulation for the effects of ionizing radiation.