15
ToT EEG
Poy
Parith
PoE RP daGtin
VE
Bebe det
14
13
12
—
©
ALTITUDE, THOUS OF FEET
11
0.01
0.1
1.0
10
100
YIELD, KT
[[] Population safe with l-psi protection
ES} Questionable
Bes Population safe with 100-psi protection
ANS
E23) Population unsafe with 100-psi protection
Population safe with 30-psi protection
Fig. 41 — Altitudes at Which Friendly Commander Could Use Nuclear Warheads
of Various Yields for Various Levels of Population Protection
exceeds the distance at which people in shelter will exceed an LD, dose in 48 hr (about
4000-r cumulative 2-day dose, at a distance from Gz ranging to 8 miles).
It seems clear that basementshelter attenuating radiation by 0.9 is not enough protection for urban dwellers, since they can receive LDs doses before rescue workers, impeded
by debris and high radiation dose rates, can reach them. It also seemsclear that the traditional civil defense postattack services will not be possible over most of the attacked area.
Since preattack evacuation is neither feasible nor desirable in view of fallout, the only
alternative would seem to be large shelters capable of sustaining life for days or weeks and
attenuating all radiation effects. In a shelter system postattack measures would consist
of working from the inside out (once radiation levels had fallen to tolerable limits) rather
than the present civil defense practice of attempting to clear roads into the damagedarea.
56
ORO—R-17 (App B)
CONFIDENLAL