CONELDENTLAL
Seven miles is roughly the outer edge of the Civil Defense B (severe) damage ring, a ring
in which civil defense traditionally expects to conduct rescue, fire fighting, and other postattack services.
Figure 39 also showsthe distance at which some trees would be blown down and the
distance at which all trees will be blown down.
It is clear that to reach people whowill
die in 48 hr rescue teamswill have to clear their way through 6 miles of downed trees and
rubble. Furthermore the debris problem is most severe where the radiation dose rates
are highest.
40
I
20
Worker accepting 100 r
_
in one hour
+
~ OE
x
i 8 fa
4—
< 67
”
—
> 4Fr
oO
=z
~
elter occupant
4
=
2
_—
ml
1
0
l
]
2,600
4,000
|
7
{
6
!
1
j
1
6,000
8,000
10,000
12,000
2-DAY CUMULATIVE DOSE,r
\
5
I
4
14,000
{
3
MILES FROM GZ
Fig. 40 — Hours of Life in Ordinarv Shelter and Waiting Time for Rescue
as Function of Distance/Dose
Figure 40 shows the hour after H+1 at which a shelter occupant will receive an LDs
dose plotted against the 2-day accumulated dose for the area in which the shelter is located.
This figure also shows the area (in terms of 2-day dose) in which a rescue worker can work
for 1 hr receiving 100 r in that hour (perhaps the maximum permissible one-shot emergency
dose). Since the two curves intersect at 12 hr, any shelter occupant whois located in an
area in which he will receive an LD, dose in less than 12 hr (cumulative 2-day dose of
5500 r) cannot be rescued (by these standards). In this particular attack, this would be
within 4 to 6 miles of az.
This radius, however, does not take into account the debris-clearance problem, nor
does it allow for the radiation received by a worker in the course of entering and leaving
the area. It could represent the minimum distance from Gz at which a rescue worker could
work if transported by air or possibly by a shielded vehicle along a debris-clear freeway,
such as the Shirley Highway. The dotted line in Fig. 39 represents the limit of penetration of the area by rescue workers on the ground.* Over most of the attacked area it
*The data comprising this line consist of the best estimate of an urban planner familiar with the road
system and potential debris near the roadways.
ORO—R-17 (App B)
55