Inelastic scattering of 88.03 keV photons by elements with 4 <= Z <= 83

Differential cross sections for the inelastic scattering of 88.03 keV photo ns have been measured at an angle of 131 degrees for 21 elements with 4 les s than or equal to Z less than or equal to 83. The measurements were perfor med under vacuum using a Cd-109 radioisotope as a photon source and a plana r HPGe detector. The product of intensity of the 88.03 keV incident photons , detector efficiency and other geometrical factors were determined by meas uring the K x-ray yields from targets of different elements and from knowle dge of the respective fluorescence cross sections. The measured inelastic s cattering cross sections have been compared with those calculated using the relativistic Klein-Nishina cross section and the nonrelativistic Hartree-F ock incoherent scattering functions. The measured cross sections are found to be in good agreement with the calculated values for all the elements und er investigation except for Gd (B-K = 50.239 keV), Dy (B-K = 53.788 keV), H o (B-K = 55.618 keV), and Tm (B-K = 59.390 keV), where these values are low er by similar to 20%, but for Bi (B-K = 90.526 keV), it is higher by 16%; B -K is the K-shell binding energy of the element.