An order of magnitude model is presented to estimate radiation from detonation of conventional explosives in an attempt to predict frequency bands and signal levels detected by other investigators. An earlier model describing the radiation generated by explosions has been refined to include the contribution of the heat capacity of the detonation products and the temperature dependence of the concentration of ionized particles. Relationships are established between explosions of uncased Composition B, the radiation frequency bands, and the E-and B-field amplitudes as a function of detection distance. The model considers the radiation from particles ionized by passage of the shock wave.