- 1A In 1953, ant scene coserveatior. . : external doses received ber Guta on fresh milk give: go. avallable. sf > lsiny seards were made, : 7 actimetest ort chem vores -ottusal fher the exposures sre mov In 1957, durin: Operation bienbobt, allk was t2sted, cut only for gross beta radiation and for strontium 90. gross beta values do not provide a basic, in this case, The for inferring iodine levels, and while calculations can be made from strontium levelc, they do not carry the same certainty as actual iodine figures. Getailed cilk monitoring figures were not reported for the 1958 test series, Operation Hardtack II. The two tests for which such m¢ritoring was reported were Project Gnoze, December 10, 1961, at Carlsbad, New Mexico and the Des Moines skot, Jume 13, 1962. dowever, all] iodine measurenents for Gnore were nade in milk collected either before the test, or at least one month after the test, when any high levels that might have occurred had already dissipateas<* For the Des Moines test milk was again monitored either too early (June 13, the day of the test) or too late. Concentrations of 600 and 500 micromicrocuries per liter were found at two locations on June 20 and 21, but the actual peaks at those locations would have come about June 15-17, two to four days after the explosion. ' y More adejuate data either have not ocen taken, not been made available to the public. or have (A report by the