Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:10:p3
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 10 (pt 3/7)
Character Range: 1128387–1131329

of an organism, system, or population to a chemical (and its derivatives).
Exposure is the concentration or amount of a particular chemical that reaches a target organism, or system, or population in a specific frequency for a defined duration.
Exposure concentration is the exposure mass divided by the contact volume or the exposure mass divided by the mass of contact volume, depending on the medium.
Exposure duration is the length of time over which continuous or intermittent contacts occur between a chemical and the exposed population.
Exposure event is the occurrence of continuous contact between chemical and exposed population.
Exposure frequency is the number of exposure events within an exposure duration.
Exposure model is a conceptual or mathematical representation of the exposure process.
Exposure pathway is the means by which a contaminant makes contact with the exposed population.
Exposure route is the way in which a chemical substance enters a target after contact (for example, ingestion, inhalation or dermal absorption).
Exposure scenario is a set of conditions or assumptions about sources, exposure pathways, concentration of contaminants involved, and exposed population (i.e. numbers, characteristics, habits) used in the evaluation and quantification of exposure(s) in a given situation.
Genotoxic chemicals are those for which there is adequate evidence of the potential to interact with, and/or modify the function of genetic material and which has the ability to induce tumours via a mechanism involving direct damage to DNA.
Hazard identification is the identification of the type and nature of adverse effects that a contaminant has an inherent capacity to cause to an exposed population.
Hazard indices/index (HI) is the sum(s) of at least two hazard quotients. It is noted that the WHO is moving towards the use of risk indices/index (RI).
Hazard is the inherent property of a contaminant or situation having the potential to cause adverse effects when a population may be exposed to that contaminant.
Hazard quotient (HQ) is the ratio of the mean daily intake to the reference dose or tolerable daily intake for threshold exposure. It is noted that the WHO is moving towards the use of risk quotient (RQ).
Health risk assessment (HRA) is the process of estimating the potential impact of a chemical, biological or physical agent on a specified human population system under a specific set of conditions.
Health risk management is the process of evaluating and implementing appropriate options to address risks identified from health risk assessments. The decision-making will incorporate scientific, social, economic and political information.
Health investigation levels (HILs) mean the concentration of a contaminant above which further appropriate investigation and evaluation will be required to ensure the protection of human health.
Intake is the total amount of contaminant (or dose) taken into