R 333.5005 Definitions; E.

Rule 5. (1) "Effective dose equivalent (HE)" means the sum of the products of the dose equivalent to the organ or tissue (HT) and the weighting factor (WT) applicable to each of the body organs or tissues that are irradiated (HE =  WTHT). (2) "Embryo or fetus" means the developing human organism from conception until the time of birth. (3) "Entrance or access point" means a location through which an individual could gain access to radiation areas. This includes entry or exit portals of sufficient size to permit human entry, irrespective of their intended use. (4) "Exposure" means being exposed to ionizing radiation. (5) "External dose" means that portion of the dose equivalent received from a source of radiation outside the body. (6) "Extremity" means hand, elbow, and arm below the elbow, foot, knee, and leg below the knee. (7) "Extremity radiography" means radiography of the hand or arm excluding the shaft of the humerus or the foot or leg excluding the shaft of the femur.