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ABSTRACT
The primary objective of Project 2.2 was to measure initialand residual-ganme exposure rates as a function of time at various
Gistances from high-yield thermonuclear detonations.
objectives were:
1)
Secondary
to measure the residual~gamma exposure rete
at the lip of the crater from a high-yield land-surface shot, and
2)
to feld-test a prototype thermal detector to be used in a radio-
logical-defense warning system.
na
The residual-gamne radiation was detected by an unsaturated
fon chamber, whose output determined the frequency of pulees that
were recormed on electrosensitive paper.
Most of the initial-
germa-radiation stations consisted of scintillation detectors vhose
output determined the frequency of pulses that were recorded on
magnetic tape.
Some initial-gaummea instruments were similar to those
used during Operation Castle.
The exposure rate near the crater was
measured with a detector-telemeter unit dropped from a helicopter.
Residual-ganma exposure rete versus time was obtained after
Ghote Zuni, Flathead, Navajo, ané Tews.
The observeé average decay
exponects for these events were 1.1 for Zuni and Tewa, 1.2 for
Fratnesd, anc 1.3 for Revajo.
In sore cases, the effect of reinfall
Si, bs
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