Entrance surface dose Absorbed dose in the centre of the field at the surface of entry of radiation for a patient undergoing a radiodiagnostic examination, expressed in air and with backscatter. The ratio F of the equilibrium equivalent concentration of radon to the actual radon concentration, where the equilibrium equivalent concentration is the activity concentration of radon in equilibrium with its short lived progeny that have the same potential alpha energy concentration as the actual non-equilibrium mixture. A committee of independent persons to advise on the conditions of exposure and the dose constraints to be applied to the medical exposure of individuals exposed for biomedical research purposes when there is no direct benefit to the exposed individual. Excluded Outside the scope of the Standards. The act or condition of being subject to irradiation.
Exposure pathways The routes by which radioactive material can reach or irradiate humans.