RS RADIATION STANDARDS, INCLUDING FALLOUT 129 The results to each station are given in table II of the iodine 131 report, and are summarized in figure 1, which gives a percentage distribution of the infant population according to the estimated thyroid dose from iodine 131, September 1961 to January 1962. From these data, it can be estimated that for the country as a whole an average year-old infant received about 160 milliroentgens during the 5-month period. REG date all of the estimated thyroid doses are less than the annual Strontium 90: The results of the strontium 90 analyses in milk have been summarized in the second report submitted for the record, the intake of strontium 90 and certain other radionuclides by the population. In tabular form the report gives the annual average strontium 90 concentrations in milk for each of the stations as well as an estimated annual average for the United States. To obtain some measure of the significance of these concentrations of strontium 90 in milk, comparisons were made of estimated total daily intakes of strontium 90 derived from the milk concentrations with the guidance of the Federal Radiation Council. These estimates are presented in table I. The assumptions underlying the estimates of intake are summarized in the report. Comparisons of these estimated average daily intakes with the guidance of the Federal Radiation Council shows that all of the intakes were in range I, the upper limit of which is 20 micromicrocuries per day. Intakes at the upper limit of range I continued indefinitely would result in radiation doses to bone and bone marrow one-thirtieth of the RPG’s for normal peacetimeoperations. Strontium 89: Since the inception of the PHS milk sampling program, there have been two periods when strontium 89 has been present in measurable levels in milk. The data for these periods are summarized in the report. Table IJ shows estimated monthly average daily intakes of the U.S. population for the periods of late 1961 and early 1962, and quarterly average daily intake for 1957, 1958, and 1959. Again, comparison of these estimated average daily intakes with the guidance of the Federal Radiation Council showsthat all of the intakes were in rangeI. Cesium 137 and barium 140: Data on milk content of cesium 137 and barium 140 are regularly reported in Radiological Health Data. The estimated intake of cesium 137 and barium 140, based on the analyses of these radionuclides in milk, has been considerably lower in relation to accepted guides than those of strontium 89 and strontium 9), sian RANGER, ReaaeCo IRso Seger