In order to measure atomic, molecular and electronic cross-section: the effective atomic number, density of electron and absorption jump factor, we have first measured pc values of compounds which are determined by mixture rule using transmission method. In order to measure experimentally the effective atomic number within absorption jump factors of compounds with Ce, the X-ray source used Am-241 whose gamma rays were stopped at secondary source (Sm), thus producing K alpha and K beta X-ray emission. The most crucial finding in this study is that measurement of the effective atomic number is not appropriate near to the absorption edge and the effective atomic number is affected by near to the absorption edge. The results obtained have been compared with theoretical values. (C) 2010 Elsevier B.V. All rights reserved.