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10. GLOSSARY
Absorbed dose—
The amount of energy deposited by ionizing radiation in a unit mass of tissue. It is
expressed in units of joule per kilogram (J/kg), and called “Gray” (Gy).
Absorption—
The taking up of liquids by solids, or of gases by solids or liquids.
Acute Exposure—
Exposure to a chemical for a duration of 14 days or less, as specified in the
Toxicological Profiles.
Adsorption—
The adhesion in an extremely thin layer of molecules (as of gases, solutes, or liquids) to the
surfaces of solid bodies or liquids with which they are in contact.
Adsorption Coefficient (K
oc
)—
The ratio of the amount of a chemical adsorbed per unit weight of
organic carbon in the soil or sediment to the concentration of the chemical in solution at equilibrium.
Adsorption Ratio (Kd)—
The amount of a chemical adsorbed by sediment or soil (i.e., the solid phase)
divided by the amount of chemical in the solution phase, which is in equilibrium with the solid phase, at a
fixed solid/solution ratio. It is generally expressed in micrograms of chemical sorbed per gram of soil or
sediment.
Benchmark Dose (BMD)—
Usually defined as the lower confidence limit on the dose that produces a
specified magnitude of changes in a specified adverse response. For example, a BMD
10
would be the
dose at the 95% lower confidence limit on a 10% response, and the benchmark response (BMR) would be
10%. The BMD is determined by modeling the dose response curve in the region of the dose response
relationship where biologically observable data are feasible.
Benchmark Dose Model—
A statistical dose-response model applied to either experimental toxicological
or epidemiological data to calculate a BMD.
Bioconcentration Factor (BCF)—
The quotient of the concentration of a chemical in aquatic organisms
at a specific time or during a discrete time period of exposure divided by the concentration in the
surrounding water at the same time or during the same period.
Biomarkers—
Broadly defined as indicators signaling events in biologic systems or samples. They have
been classified as markers of exposure, markers of effect, and markers of susceptibility.
Cancer Effect Level (CEL)—
The lowest dose of chemical in a study, or group of studies, that produces
significant increases in the incidence of cancer (or tumors) between the exposed population and its
appropriate control.
Carcinogen—
A chemical capable of inducing cancer.
Case-Control Study—
A type of epidemiological study that examines the relationship between a
particular outcome (disease or condition) and a variety of potential causative agents (such as toxic
chemicals). In a case-controlled study, a group of people with a specified and well-defined outcome is
identified and compared to a similar group of people without outcome.
Case Report—
Describes a single individual with a particular disease or exposure. These may suggest
some potential topics for scientific research, but are not actual research studies.
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