The K-shell absorption jump factors and jump ratios were derived from new mass attenuation coefficients measured using an energy dispersive X-ray fluorescence (EDXRF) spectrometer for Tin, Yb elements being Tm(2)O(3), Yb(2)O(3) compounds and pure Lu, Hf, Ta, W, Re and Os. The measurements, in the region 56-77 keV, were done in a transmission geometry utilizing the K(alpha 1), K(alpha 2), K(beta 1) and K(beta 2) X-rays from different secondary source targets (Yb, Ta, Os, W, Re and Ir, etc.) excited by the 123.6 keV gamma-photons from an 5 Co annular source and detected by an Ultra-LEGe solid state detector with a resolution of 150 eV at 5.9 keV. Experimental results have been compared with theoretically calculated values. The measured values of Tin, Yb, Lu, Hf, Ta, W, Re and Os are reported here for the first time. (c) 2007 Elsevier B.V. All rights reserved.