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For purposes of estimating radiation dose, especially from external exposure, the head, trunk (including male gonads), arms above the elbow, and legs above the knee.
The measurement of radioactivity in the body by use of radiation detectors outside the body to detect penetrating radiation (gamma rays and x rays) emitted by the sources.
(A) Electromagnetic radiation emitted in de-excitation of bound atomic electrons, frequently occurring in decay of radionuclides, referred to as characteristic X rays, or (B) electromagnetic radiation produced in deceleration of energetic charged particles (such as beta radiation) in passing through matter, referred to as continuous X rays or bremsstrahlung; also called X rays. See gamma radiation and photon.
The total energy released in a nuclear detonation, usually expressed in kilotons (kT) or megatons (MT). The announced yield includes the energy released by fission and fusion.