An experimental study of the EMF arising when semiconductors (germanium) in a magnetic field are bombarded with ionizing particles ( alpha -particles, protons)-the radiative electromagnetic effect (the REM effect)-has been carried out. It has been shown that the REM EMF depends linearly on the magnetic field and alpha -particle flux. The observed effect breaks out at the p-n junction which is created under the bombardment of germanium sample with alpha -particles. The even REM effect, which is quadratic with the magnetic field, has also been measured.