During Shot Navajo, Round 2B, fired 15 minutes and 2 seconds after detonation, and Round
5B, fired 15 minutes and 8 seconds after detonation, were launched at the same quadrant elevation to check the reproducibility of information from rockets following the sametrajectories at
essentially the same time. Figure 4.7 shows activities measured by rounds as a function of
time after launching of individual rockets. Peak intensities recorded acreed within 2 percent.
The areas under the curves, which gave a measure of total activity measured by the rockets,
190
[
}————
_
4
—+—— to
span
1
.
wnoe
—Tet ae
~
+
+
--4
et
a!
i
-
Troma
v
A
eee
?
ee pe
~—
4
rf
1
{
(
{
,
LL.
|
|
|
107!
—+
z
2
i
——
5
uo
2
~
z
1
=
4
{
=
a
!
3
s
Oo
|
10
:
2
}
(
t
*
=
na
—|.—.._+--%s, 4
&
L%
| we,
—
103
te,
“ee
al
0
100
*s%
0
120
ALTITUDE |"HKOUSANDS OF FEET)
Figure 4.1 Concentration of gamma emitters to produce 1 r/hr
field in an infinite volumeof air.
agreed within 7 percent, and the times to peak activity were 1 second apart. Since 1 second is
the sampling period in the readout system, the peaks could be between 1.5 and 0.5 seconds apart.
Of the four rockets fired during Shot Tewa, only one produced useful radiological information. However, it is of interest to compare the one round producing information with a round
fired at the same time after detonation, at the same quadrant elevation of launch and as far as
can be determined, at a similar part of Shot Cherokee. Round 3 at Shot Tewa and Round 5A at
Shot Cherokee were both fired at 7 minutes after detonation and were launched at a quadrant
elevation of 75 degrees. Figure 4.8 shows a comparison of the data obtained from the two
rounds, The lower curve shows the Shot Tewaresults normalized to the same fission to total
yield ratio as Shot
30