In the Pd/D co-deposition process, working and counter electrodes are immersed in a solution of palladium chloride and lithium chloride in deuterated water. Palladium is then electrochemically reduced onto the surface of the working electrode in the presence of evolving deuterium gas. Electrodes prepared by Pd/D co-deposition exhibit highly expanded surfaces consisting of small spherical nodules. Because of this high surface area and electroplating in the presence of deuterium gas, the incubation time to achieve high D/Pd loadings necessary to initiate LENR is orders of magnitude less than required for bulk electrodes. Using a Dewar-type electrochemical cell/calorimeter, it was shown that the rates of excess enthalpy generation using electrodes prepared by the Pd/D co-deposition technique were higher than that obtained when Pd bulk electrodes were used.1 Positive feedback and heat-after-death effects were also observed with the Pd/D co-deposited electrodes. Infrared imaging of electrodes prepared by Pd/D co-deposition show that the working electrode is hotter than the solution indicating that the heat source is the Pd/D co-deposited electrode and not Joule heating.2 Infrared images also show that the heat generation is not continuous, but occurs in discrete spots on the electrode. The ‘hot spots’ observed in the infrared imaging experiments suggest that ‘mini-explosions’ were occurring, These ‘mini-explosions’ were confirmed by conducting the Pd/D co-deposition directly on a piezoelectric transducer. To verify that the heat produced by Pd/D co-deposition was nuclear in origin, experiments were conducted to detect the nuclear ash. Using the Pd/D co-deposition, the following nuclear emanations have been detected: X-ray emission,3 tritium production,4 transmutation,5 and particle emission.6,7