 Vol. 8 / No 12 (2008) Compton and Bremsstrahlung Cross Sections Ratio S. A. Hamouda Department of Physics, University of Garyounis, P.O. Box 9480, Benghazi, Libya Email: dr_s_hamouda@yahoo.ie Abstract Bremsstrahlung background (BB) contribution to gamma-ray Compton scattering spectra was discussed and photoelectron bremsstrahlung to Compton cross section ratios were calculated up to Z= 92 for an incident photon energy of 662 keV. These calculations show that the contribution of bremsstrahlung radiation to Compton spectra was insignificant. Introduction The problem of bremsstrahlung background (BB) in association with Compton profile measurement was based on an interpretation that photoelectrons and Compton recoil electrons may introduce an extra background as the consequence of the rapid deceleration of an electron in the electric field of an atom in the target. This BB, could extend to the energy region of Compton spectrum. Because these electrons have high kinetic energy, another concern was raised that they may reach the detector and affect the measurement. This problem has been raised by the Polish group [1]. They concluded that the discrepancies between their experiment and theory at high momentum >4.0 a.u. was attributed to bremsstrahlung radiation. They also suggested that this effect would increase with incident photon energy and atomic number. If this explanation was real then it would have been observed in the experiments carried out by the author and elsewhere [2,3] because these systems are similar.