Airborne radioactive material means radioactive material dispersed in the air in the form of dusts, fumes, particulates, mists, vapors, or gases. Collective Dose is the sum of the individual doses received in a given period of time by a specified population from exposure to a specified source of radiation. Dose Equivalent means the product of the absorbed dose in tissue, quality factor, and all other necessary modifying factors at the location of interest. Effective Dose Equivalent is the sum of the products of the dose equivalent to the organ or tissue and the weighting factors applicable to each of the body organs or tissues that are irradiated. External Dose means that portion of the dose equivalent received from radiation sources outside the body.
Extremity means hand, elbow, arm below the elbow, foot, knee, or leg below the knee.
Nonstochastic Effect means health effects, the severity of which varies with the dose and for which a threshold is believed to exist. Radiation-induced cataract formation is an example of a nonstochastic effect. Quality Factor means the modifying factor that is used to derive dose equivalent from absorbed dose. Rad is the special unit of absorbed dose. Rem is the special unit of any of the quantities expressed as dose equivalent.