If Specify release times is selected from the
Particle release specification list in the physics interface
Particle Release and Propagation section, the
Mass Deposition subnode is available from the context menu (right-click the
Wall parent node) or from the
Physics toolbar,
Attributes menu. The
Mass Deposition subnode uses an accumulated variable on each boundary element in the selection of the parent node to calculate the mass of particles deposited on the surface, expressed in mass per unit area.