NV/HEG Mtg.-Sept. 26-27, 9968 Page 7 To be effective, protective actions must be not only operationally feasible but also prompt. The substitution of uncontaminated hay or milk must be in sufficient quantity. days of milk substitution. iodine but There is a 90 percent reduction for 20 People in an affected area can be given in a large population this involves risks to individuals who are pregnant. used routinely, However, it is believed that where iodized salt is the uptake of radioactive iodine is reduced. It should be noted that the Federal Radiation Council concluded that such protective actions are not justifiable under conditions most likely to occur to avert "individual" doses of less than 30 rads to the thyroid. But since the "individual" varies from the "average suitable sample of the population" by a factor of 3, protective action is justifiable at the 10 rad levels--the dose that might be received if protective action were not taken. There is however some leeway because the FRC allows that level of 10 rads to be raised if the protective action will have a high impact on the community in question. - * SNL There was some discussion regarding the justification of raising the I-131 dose NV/HEG standard from 1.5 rads per year to a less restrictive figure more consistent with national standards in the event of a resump- Captain J. E. Dieckhoner, AFWL, Kirtland AFB, discussed te U.S. Air Force technique for predicting I-13] ground deposition. ; s : R 7 oo AIR FORCE PREDICTION TECHNIQUES FOR I-131 DEPOSITION yrrns, ream tion of atmospheric testing--perhaps to the PAG level of 10 rads. This system COMEDIDOF LAT A RC 77 G