Scanning proton microprobe microanalysis for the assessment of homogeneity of IAEA urban dust reference materials

In order to develop new reference materials for microanalytical nuclear techniques, scanning proton microprobe (SPM) technique was used to determine homogeneity level within 100 × 200 μm2 micro-area on the small pieces of IAEA urban dust reference materials. The experimental methods were described in detail. The results show that IAEA-396A/M Vienna urban dust is homogeneous enough for small sample analysis of standard reference material (SRM).