In this work, we calculated the gamma energy (Eg) of scattered photons in Compton effect, as a function of scattering angle,q. We have used in this work gamma radioactive source, Cisium-137 (137Cs); its intensity is 3,33.105Bq, where it has been oriented towards an aluminum scatterer. The results obtained showed that the energy variation of the scattered photon on an aluminum scatterer, as a function of the scattering angle, is in good agreement with the values obtained by theoretical equation.