Abstract: Described herein is the use of a biased suitable ferrimagnetic crystal or suitable ferromagnetic crystal, for example, a hexaferrite ferrimagnetic semiconductive crystal for detection of the radiation on GHz frequencies. Specifically, the frequency of either ferromagnetic or multidomain resonance of the hexaferrite semiconductor crystal can be changed as a result of electric current flow and the value of current can be calculated based on the frequency shift measurement. This principle can be used for radiation detection.