c 2. practices that add to natural background radiation. These dose limitations exclude exposures received in the course of medical procedures. (These same qualifications with regard to natural backgmund and medical procedures are applied to FRC and NCRP recommendations, ) ICRP developed the concept of "acceptable risk." Teta Unless man wishes to dispense with activities involving exposures to ionizing radiation, he must recognize that there is a degree of risk and limit the radiation dose to a level at which the assumed risk is deemed to be acceptable to the indivadal and to society because of the benefits derived from such activities. For planned exposures of individuals and populations, the ICRP has recommended the term “dose limit." It is not desirable to expose members of the public to doses as high as those considered to be acceptable for radiation workers because children are involved, members of the public do not make the choice to be exposed, and members of the public are not subject to selection, supervision and monitoring, and are exposed to the risks of their own occupations. For planning purposes, dose limits for members of the public are set a factor of ten below those for radiation workers. —— The dose limits for members of the public are a somewhat theoretical concept intended for planning purposes. It will seldom be possible to ensure that no single individuel exceeds this dose limit. Even when individual exposures are sufficiently low so that the risk to the individual is acceptably small, the sum