[8] This work is supported by NASA grant NNX13AF53G (C.F.). We are indebted to Dr. Frank Stadermann whose ideas and enthusiasm this research is based upon. We thank R.S. Lewis for providing the NDs from the Allende meteorite. The LEAP tomograph at NUCAPT was purchased and upgraded with funding from NSF-MRI and ONR-DURIP programs. Instrumentation at NUCAPT was supported by the Initiative for Sustainability and Energy at Northwestern. This research made use of the EPIC facility and Shared Facilities at the Materials Research Center, supported by the MRSEC program (DMR-0520513 and 1121262) of NSF.
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