-23- basis. The FRC identifies the critical segment of the population for which dose projections are to be made for comparison with the guides. For instance, for 13ly in milk, the criticai segment is children one year of age. In cases where it is not practical to estimate individual doses, action will be based on average values of radiation exposure. Guides for both individuals and a suitable sample are provided. For 1317 in milk, the suitable sample is to consist of children approximately one year of age using milk from a reasonably homogeneous supply. Numerical guidance for PAG's is provided in two reports, FRC Nos. 5 and 7 summarized in Table IV. EY ns