WITH DOSE Exposure is the contact of a chemical with the outer boundary of a person, such as the skin, nose, or mouth.
Exposure is measured as the concentration of the chemical multiplied by the time of contact.
Potential dose is the amount of chemical contained in material ingested, air breathed, or bulk material applied to the skin, while the applied dose is the amount of the chemical in contact with the major absorption boundaries, such as the skin, lungs, and gastrointestinal tract, and available for absorption. For the respiratory route, the internal dose is the amount of the chemical absorbed via the lung. The delivered dose is the amount of the chemical available for interaction with any particular organ or cell. All of these dose terms are measured as the mass of the chemical. When doing a risk assessment, frequently individual risks are calculated for some or all of the persons in the population being studied and then are put into the context of where they fall in the distribution of risks for the entire population.