[en] In the present study the intensity distribution of 279 keV gamma rays Compton scattered from K-shell electrons of molybdenum, silver and tin at scattering angles in the range from 30 deg to 150 deg is measured. As the binding energy of the electrons in the K-shell is comparable to the incident photon energy the K-shell differential Compton cross section differs significantly from the free electron Compton cross section which is defined accurately by Klein-Nishina formula. Various relativistic and non-relativistic theories are developed to calculate this discrepancy. The general prediction of these theories is that the K-shell Compton cross section is significantly smaller than the Klein-Nishina values at small scattering angles and increases with scattering angle. Some relativistic calculations show that the ratio of K-shell to free electron differential Compton cross-section firstly increases to a maximum at small scattering angles, passes through a broad minimum and then increases slightly at large scattering angles which is confirmed by some experiment investigations. In view of these inconclusive results present work is undertaken. 279 keV gamma rays from ²⁰³Hg radioactive source of 400 mCi strength irradiate scatterer having thickness 40 mg/cm² and diameter 40 mm.The scattering foil is viewed by two NaI(Tl) scintillation detectors, one 38 mm diameter and 3 mm thick sensitive to fluorescent K X-rays emitted from the scatterer and the other 51 mm diameter and 51 mm thick sensitive to scattered gamma rays. A coincidence set up using Canberra ARC timing amplifiers in the fast channels and having 30 nsec resolving time is used to record the events. The energy selection in the X-ray channel is such as to accept only the K X-ray peak of the scatterer and the gamma ray channel is adjusted to accept photons above the K X-ray peak up to incident photon energy. The general trend of our experimental results is that these increase with scattering angle. At higher scattering angles the value of ratio of K-shell to free electron cross section is greater than unity, which shows that the binding effects are more predominant at large scattering angles. Our experimental results are also compared with the available theoretical and experimental data. (author)