Figures 3.27 and 3.26 show that approximately two-thirds of the
total initial exposure for Flathead 221.04 and Navajo 221.05 is delivered
after the arrival of the shock front.
Most of this exposure is due to
the enhancement caused by the hydrodynamic effect, because the exposure
rate was decaying rapidly before the arrival of the shock front.
Reference 9 ecupares measured initial gamma exposure-versus-distance
eurves with curves computed from IN 23-200.
For the purpose of comparison
with published data, integrated initial games rate data froz Pigures 3.26,
3.27, and 3.28 of this report have been plotted on the corresponding curves
from Reference 9.
In afdition, extrapolation of Project 2.2 measured data
(integrated initial gama rate) to include initial gamm dose delivered after
the ené of project records hes been made using information and methois--¢
in Reference 10.
Exposure received prior to start of project recoris
has been neglected, since the exposure is relatively insignificant.
The above-
mentioned plots for Shot Zuni are shown in Figure 3.29 and for Shots Flathead
end Kavajo in Figure 3.H.
3.3 MEACH-BALL MEASUREMENTS
St. Louis FRC
The objective of measuring the exposure rate at the lip of the
crater from Shot Zuni was asswmed by Project 2.2 at a late stage in the
preparations for Operation Redwing.
he beach-bell instrument was dropped
cato the Zuni crater lip at H+ 6 hours.
The fall apparently caused
ehange in the ealibration of the system, because the received data
indicated an exposure rate as high as 50,000 r/hr at this late time.
Furthermore, rotor interference made reception of the transmitted signel
@ifficult.