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Project 2.65 - Analysis of Fallout and Base Surge - M. Morgenthau
OBJECTIVE
To survey the close-in residual contamination field resulting from the
‘Sebco. ) shot.
DESCRIPTION AND EYPEPIMONTAL PROCEDURES
For this event the project hed only limited participation, consisting of
an eerial survey on i, Mtl, end M+2 days,
The survey was made of the portion
of Eniwetok Atoll contaminated to a sigenificent amount by this event.
included the islands tetween Engebi and Aomon.
This
Particular attention wes paid
to the residual conteminetion on Rujoru, Eberiru, end Aomon,
The measurements
were taxen by means of a probe on a long catle suspended below a hovering
helicopter.
The position of the probe was determined by reference to charts
and aeriel photographs.
RESULTS
Aerial survey readings teken on three successive days were corrected for
meter calibration and corrected to H+l hour values as shown in Table 2.65-1 by
using the decay exponent of -1.10.
This decay exponent was determined from a
plot of field dose rate readings vs time for three of the islands surveyed as
shown in Fig. 2.65-1,
These particuler islends were chosen for this plot
because of their low background prior to the shot.
Ht+l hour extrapolated
readings for Eberiru Island are skown in Fig. 2.65-2.
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