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Superconducting tunnel junctions (STJ) are promising high-resolution radiation detectors because of their larger energy resolution with respect to conventional Si-based detectors. We have developed a fabrication process for Nb/Al–AlOx/Nb STJ devices which produces junctions with subgap currents below 50pA at 300mK, a factor of 10−6 less than the subgap current at 4.2K. We report the details of the fabrication process and preliminary results on X-ray measurements at 300mK with a 5mC 55Fe source.