-6- It might ve auded that the Aton.c Energy Commission issues licenses for the handling of iodine 131 concentrations higher than .O2 microcuries per liter. Our estimates show that dozens of times the milk in these sreas could contain more than .05 microcuries per liter. Strictly speaking, the farmers and dairies should have had an AFC license to handle the milk at all. 4) Tne diological effects of radiation exposure of the thyroid, at the levels expected in the region of the Nevada Test Site, are readily deiucea from the available literature. There is goneral acieuli fir agi concn! Lhat radiation in sufficiently large doses can cause thyroid cancer. agreed, as stated in the Federal kadiation Council It is also Report No. 2 (September 1961), that "the child's thyroid is more sensitive to the carcinogenic effects of radiation than the adult thyroid. This conclusion is based vpon several studies in re- cent years of the secursence of thyroid carcinoma in children who had previously received therapeutic X-irradiation in the neck region for eniarged vhymus or for other tenign head and neck conditions. The incidsunce of thyroid carcinoma in these children was significartly nigher than in control groups who had not been previously irscadiated. In these studies cancer of the thyto'. was observeu ia children after exposures as low as approximatsly lo) ren " Thus, the pocs:Lie tiy.cid radiation exposures of children near the Nevada Test Site is clearly in the range considered