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