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Assessing the microscale heterogeneity in Standard Reference Material 4600 Surrogate Post-detonation Urban Debris
Jacqueline L Mann1, John L Molloy2, JoAnn Buscaglia3
1NIST, Inorganic Chemical Metrology Group, Chemical Sciences Division, Material Measurement Laboratory, Building 227 Room B352, MS 8391, 100 Bureau Drive, Gaithersburg, MD, 20899, USA.
Abstract:
Nondestructive microbeam X-ray fluorescence (μXRF) spectrometry has been used to investigate the elemental microheterogeneity in a nuclear forensics reference material (RM), NIST SRM 4600 Surrogate Post-detonation Urban Debris. Using a principal component analysis (PCA) model, results indicate the majority of elements appear homogeneous; however, zinc (Zn) exhibits microscale heterogeneity for this SRM. To minimize contributions to the measurement uncertainty from elemental microheterogeneity, a minimum sample mass of 24 mg is recommended for analysis.
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