Appl Radiat Isot 2021 Jun 23;172:109651. Epub 2021 Feb 23.
NIST, Radioactivity Group, Radiation Physics Division, Physical Measurement Laboratory, Building 245 Room C116, MS 8462, 100 Bureau Drive, Gaithersburg, MD, 20899, USA. Electronic address:
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. Read More