Miles, M

Anomalously high radiation counts were observed using several different Geiger-Mueller (GM) detectors as well as sodium iodide (NaI) detectors during electrolysis experiments with palladium cathodes in heavy water. These high radiation counts were often observed in codeposition experiments where palladium metal is deposited from a D2O solution onto a copper cathode in the presence of evolving deuterium gas. The anomalous radiation counts reached values as high as 73 sigma above normal background counts. The anomalous radiation would appear within a few hours in the co-deposition experiments where the palladium is loaded with deuterium as it deposits from solution. In contrast, the appearance of anomalous radiation required days of electrolysis for the palladium rods that load much slower. The real or artifact question stems mainly from the fact that two similar GM detectors often gave different results in monitoring the excess radiation. A few experiments, nevertheless, gave simultaneous anomalous effects from two different radiation detectors.