fraction of inhalable particles that enter the deepest part of the lung, the non-ciliated alveoli

Risk characterisation' is the estimation of the incidence and severity of the adverse effects likely to occur in a human population or environmental compartment due to actual or predicted exposure to a substance, and may include 'risk estimation', i.e., the quantification of that likelihood

rock or other material used to armor shorelines, streambeds, bridge abutments