[en] Using a Debye-Scherrer counter diffraction technique the lattice parameter increase of Pd-H and Pd-Ag-H-systems was measured 'in situ' at helium temperatures as a function of the implanted hydrogen dose. At high hydrogen concentrations a sudden, total hydrogen loss from the target is observed during implantation. These X-ray measurements explain the sudden vanishing of superconductivity and the consequent change in resistivity of these alloys. From the intensity-profile of the diffraction peaks we can firstly, estimate the H-concentration distribution and secondly, we can measure the maximum lattice parameter from which in turn we can infer the maximum H-concentration. (orig.)