ICRP recommendations

The basic framework of radiological protection derives directly from the form of the biological effects produced by exposure to ionising radiation. It is intended to prevent the occurrence of deterministic effects, by keeping doses below the relevant thresholds, and to ensure that all reasonable steps are taken to reduce the induction of stochastic effects. Stochastic effects cannot be completely avoided because no threshold can be invoked for them. The framework therefore has to include social as well as scientific judgments. The Commission has attempted to make these as transparent as possible. The principles on which the system of radiological protection proposed by the ICRP is based are set out and some of the major features emphasized in the 1990 recommendations are discussed, in particular the justification of a practice, the optimisation of a practice, individual dose limits, potential exposures and interactive situations. (author)