The purpose of this new Regulation is to unite in a single instrument the existing rules on this subject contained in Decree 2519/1982 as amended by Decree 1753/1987, now repealed, as well as to introduce certain modifications which have proved desirable in the light of the practical application of those rules. The 1987 Decree reflected the basic safety standards of the Euratom Directives. Like that Decree, the new regulation lays down the measures for protection of the public and occupationally exposed persons against the dangers of ionizing radiation. The Regulation is supplemented by Appendices providing for definitions of radiological, biological and medical terms, annual dose limits for the public and for occupationally exposed persons, etc. (NEA).