A.6.4.2 Distributional heterogeneity (DH)

Uneven, nonrandom distributions (scatter, groupings, deposition) of particles and contamination across a DU yield both small-scale and large-scale (e.g., spatial/temporal) DH. Some areas of the DU may consist of significantly more particles than other areas of the DU (e.g., Figure A-16). There could be isolated area(s) within the DU consisting of more particles (of varying shape, size, orientation) with higher contaminant loadings (e.g., hot spots).