10 R. SCOTT RUSSELL it would be unnecessary to examine other foods. However,if there is only a short interruption of milk production the necessity for this work is doubtful, provided that the operationof the establishment is known to be normal. . Surveys of the type here suggested involve only a few dozen measurements per year. Finally a question which, strictly, lies beyond the scope of this paper may be considered. Sometimes it is suggested that environmental surveys greatly exceeding those here suggested are both justified and desirable, if not for scientific reasons, because they have an excellent effect on public relations. As against this view, is it not possible that considerably greater public confidence might be encouraged if it became widely known that the major potential risk had been so clearly identified that a limited programme was wholly adequate? There may, indeed, be somejustification for suggesting that the design of environmental surveys should only be entrusted to those who, though fully conscious of the importance of ensuring safety in the environment are, in modern parlance, strongly motivated to reserve their energies as much as possible for more productive tasks. These will necessarily be persons who see the problems of environmental surveys in true perspective. REFERENCES 2. 3. Dunster, H. J. This Symposium, p. 29. International Commission on Radiological Protection, Recommendations of the ICRP, Publication 2. Pergamon Press, London (1959), Minister of Housing and Local Government and Minister for Welsh Affairs and the Secretary of State for Scotland, The Control of Radioactive Wastes, Cmnd, 884. HMSO, London (1959). 4. Food and Agriculture Organisation of the United Nations, Radioactive Materials in Food and Agriculture, FAO Atomic Energy Series No. 2. FAO, Rome (1960). United Nations, Report of the Scientific Committee on the Effects of Atomic Radiation, General Assembly, Official Records: Seventeenth Session, Supplement No. 16 (A/5216). United Nations. New York (1962). 6. Russet, R. S. Ann. Rev. Plant Physiol. 14, 271-94 (1963). 5. ADDENDUM Since this paper was prepared ICRP have issued Publication 6 (1964). The designation of different groups in the population has been revised and other modifications have been introduced, but the general interpretations referred to in this paper are not affected.

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