Documents / Report
This synopsis was prepared by Oak Ridge National Laboratory for the All-domain Anomaly Resolution Office (AARO). It reports on an analysis of drill shavings and a small bulk piece from a metallic specimen claimed to be linked to an unidentified phenomenon over central Ohio around 1995. Chemical assays, microscopy, computed tomography and gamma spectroscopy showed a conventional near-eutectic aluminum-silicon casting alloy that had cooled slowly and gave off no radiation. The report concludes the specimen is ordinary terrestrial industrial metal with no evidence of exotic origin.
Synopsis: Analysis of a Aluminum Specimen1 Executive Summary The All-Domain Anomaly Resolution Office (AARO) sponsored a series of measurements on drill shavings and a small sectioned piece from a metallic specimen. Oak Ridge National Laboratory (ORNL) independently performed multiple, cross‑validated measurements showing that the material is a conventional, near‑eutectic aluminum–silicon alloy (i.e., an ordinary aluminum alloy made for common applications). Its chemistry, microstructure, internal porosity, and lack of radiological signature are consistent with decades of known industrial practice, specifically falling within the profile of standard 300/400-series casting alloys that have been widely produced since at least the 1970s. AARO requested a technical analysis of a metallic specimen with claimed association to an unidentified phenomenon occurring over central Ohio in the mid-1990s. ORNL was charged with evaluating specific assertions of unusual sample composition. ORNL received three bags of drill shavings and one small bulk piece of the specimen—integrating chemical assays, multiscale imaging, x‑ray spectroscopy, and gamma spectroscopy to perform this evaluation. ORNL found the sample exhibits the following qualities: (1) aluminum composition with approximately 12% silicon by weight; (2) standard second phases and casting pores; (3) features indicating slow-cool‑ ing, consistent with conventional large casting in a mold; and (4) no abnormal gamma emission. Nothing in the data suggests novel physics or exotic origin. Specifically, microscopy revealed silicon plates/needles, iron- and manganese-bearing intermetallic sec‑ ond phases, and shrinkage porosity—features that are typical of slow‑cooled castings. The sample’s chemical composition shows no evidence of elements outside those expected for conventional alumi‑ num metallurgical engineering, and gamma spectroscopy showed no unexpected emission. In conclusion, none of these data support claims of unusual characteristics. The evidence points to ordinary, terrestrial industrial metallurgy consistent with parts used in (late 20th century) automotive, aerospace, and consumer applications. These conclusions are robust for the samples provided and for the methods described herein.
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Report, from the aaro collection. The PDF is mirrored here; the original link is above. 10 pages are in the text index: search them above, or from the library's search.