agreed with these
doses scaled from 1-kt curves in TM 23-200 (Reference 12) to a 1-ton yield
calculations.
d 1-ton yield
All open-field test results (adjusted to 1-ton yield) were divided by the predicte
asa function
plotted
and
n,
detonatio
from
(calculated and scaled) data for each 100-yard distance
to note trends in the varof distance in Figure 13. From the curves in this figure, it is possible
iation of test results from predictions.
-burst values by a factor
The doses from thelow air bursts were higher than predicted surface
the theory that initial
of two for close-in distances (100 to 300 yards). This is in keeping with
nt air burst. Many
equivale
an
to
ed
compar
percent
50
by
reduced
is
dose from a surface burst
basic references (such as References 7 and 12) indicate that surface and near-surface bursts
produce the sameinitial gamma dose.
Figure 13 shows that the low air-burst doses do approach
the surface-burst doses at distances in excess of 1,000 yards.
This phenomenon would favor the
use of a low air burst rather than a surface burst for tactical employment, as there would be a
bonus in the higher target dose. Figure 12 illustrates this bonus quite well. The 7.8-ton low
air burst (Shot Humboldt) delivered agmuchgammadosewithin400 yards of ground zero,
.
:
Lethal doses (600 r)
‘were r@ceived Gi approximately 150 yards trom detonation
The delivery crews,
in the open, would receive only 15 r or less of initial gamma radiatiofi at a range of 600 yards.
For the case of an air burst and a surface burst having the sameyield, it can be seen from
Figure 13 that at distances within 300 yards from detonation, the air burst delivered at least
25