1 the Federal Radiation Cc, tue carcinogenic drawing effect :1, of ridiatis. ._ in its Report No. 2 discusses che onyeocias of childrec, upon the evidence of .icnificauntly nicher incidence of carcinoma in children who in the neck region, hud been cexmorea to x-irradiation than in control sroups not so exposed. The czallest dose capable of iniucing cancer is not known, but it is generally assumed that the frecucney of induced cancer may be proportional to icre, down to very low levels or exposure. On the assumption of no threshold, Beach and Dolphin of the United Xingdom Atomic Enercy Authority estimate that if one million infants were exposed to one rad of thyroid radiation, 35 would be expected to develop thyroid cencer.. The AEC's permissible external effective biological dose of 3.9 r could result in an internal thyroid dose of 175 to 1200 rads, and actual exposures, as we have Shown, may have ranged from well below to well above this dosage. 6) Underground tests Significant radiation levels from continental testing ave not been confined to surface and atmospheric shots.. Venting of subsurface shots nas been reported for at least seven cases: March 23, 1955 (shot ESS, of Operation Teapot); September 15, 1961; December 10, 19€1 (Froject Gnoze); March 5,. 1652; April 14, 1062; May 19, 1962; June 13, 1962 (the Des Moines shot) and July 6, 1962 (the Sedan shot, 100 kiloton 4 shot 635 feet underground),1+©9+<¢1 Tre Des Moines shot resulted