The Lγ2Lβ3, Lγ3Lβ3, LηLβ1, Lβ5Lα1, Lβ6Lα1, and LlLα1 radiative-transition probability ratios have been measured for 13 elements ranging in atomic number from 62Sm to 92U. This has been accomplished by bombarding the elements with an electron beam of constant energy and flux, and counting the x-ray photons emitted by a given electronic transition. The corrected measured ratios are compared with the results calculated on the basis of the relativistic-Hartree-Fock-Slater (RHFS) potential and those calculated on the basis of the relativistic-screened-Coulomb (RSC) potential. In general, values calculated on the basis of RHFS potential are favored except for the LlLα1 ratio where the measured values and those obtained from a RSC-potential calculations are in excellent agreement and are as much as 40% lower than the values obtained assuming a RHFS potential. The Lγ2Lβ3 and Lγ3Lβ3 values obtained with a RSC potential are as much as an order of magnitude greater than experimental values at high Z, and are not included in the graphs. The estimated error of the experimental results is from 10 to 15%. Other experimental values are also included for comparison.