Gamma-ray images of fast D and 4He ions accelerated with third-harmonic ion-cyclotron resonance heating of 4He-beam were simultaneously recorded for the first time in JET tokamak experiments dedicated to the investigation of burning plasmas with 3.5-MeV fusion alpha (a) particles. Gamma (g) rays, born as a result of nuclear reactions 9Be(a,n g) 12C and 12C(d,p g) 13C between the fast ions and the main plasma impurities, are measured with a 2-D multicollimator spectrometer array, which distinguishes the g-rays from accelerated D and 4He-ions. Tomographic reconstruction of the g-ray emission profiles gives images of the fast-ion population in the poloidal cross-section. The potential of this technique to visualise several energetic ion species and to determine their behaviour in different plasma scenarios is demonstrated.