C -2- ( recommendations for dose limits are necessarily arbitrary because of their mixed technical and value judgement foundation. The dose limits for individual members of the public and for the average population recommended by NCRP represent a level of risk considered to be so small compared with other hazards of life, and so well offset by perceptible benefits when used as intended, that public approbation will be achieved when the informed public review process is completed. For peaceful uses of radiation NCRP provides yearly numerical dose limits for individual members of the public, considering possible somatic effects, and strongly advocates maintenance of lowest practicable exposure levels especially for infants and the unborn. NCRP also recommends yearly dose limits for the average population based upon somatic and genetic considerations and promulgates the ICRP limit of 5 rems in 30 years for gonadal exposure of the U. S. population. Table III contains a summary of recommended values. NCRP Report No. 39 entitled, "Basic Radiation Protection Criteria," dated January 15, 1971, contains the most recent updating of NCRP recommendations for protection of the public.