L X-RAY FLUORESCENCE CROSS-SECTIONS MEASUREMENTS FOR ELEMENTS 56≤Z≤66 IN THE ENERGY RANGE 11-41 keV S. SINGH, S. KUMAR, D. MEHTA, M.L. GARG, N. SINGH, P.C. MANGAL and P.N. TREHAN J. Phys. Colloques, 48 C9 (1987) C8-669-C8-672 DOI: 10.1051/jphyscol:19879116