-15of many rural children. Since much of the region surround~ ing the Nevada Test Site is occupied by farms and rather small towns, in which this type of Joon] milk consumption must prevail, it becomes necessary to know the iodine 131 content of num3rous Separate small farm-size milk supplies in order to determine the iodine 131 intake of children living in this region. Unfortunately appropriate measurements of iodine 131 in local milk supplies do not appear to have been made. For this reason gir29t estimates of the hazard to the thyroid. are not possible, ag they are in the case of many large-scale populations which consume commercial nilk supplies. Iodine 131 measurements of commercial milk supplies for a nupber of cities have been available since 1957. Because of tho lack of such direct information on iodine 131 levels of milk consumed by children in the region of the Nevada Test Site, it dDecomes necessary to develop « method for estimating these values from other types of fallout measurements. In what follows, we consider how this can be done. 2) r estimation of iodine } s gverall measurements ofgamma and betaradistion When nuclear fission occurs, a wide range of atomic products result. The physical processes which result in the appearance of the different products of nuclear fission have been stucied extensively. From these studies,