ABSTRACT
During the Fa i, 1952
atomto weapons teste (Operation
Ivy), date for evaluating the e1:fects of radioactive debris on
health and sensitive industry were obtained by radiciox’ sa)
counting of daily settled duet eamples from a worldwic. :.stwork
of 107 stetions, and by rediation measurements with epecielly
designed instruments, in flights over the north Pacific Lalande. .
CHAPTER 1 ~ PLAN AND ORGANIZATION
1.1
Radiation 3 Feet above Greund fron
Readings at 3 Altitudesecccsccccccccccccece
The maximum aerial reading, equivalent to 1.5 ar/hr
4
three feet above ground and to © sumulative dose of 500 ailli=)
roentgens, was obtained over Agrihan in the Marianas, on the
third day after MIKE shot.
CHAPTER 2 ~ FINDINGS
201
202
203
toh
205
206
Radiation Intensity ead Settled
~ The highest 2, hour fallout was 5,600,000 d/a/eq ft
Aotivity at Guamecess snecvcccsescccccecore
at Iwo Jima on M$ Le
Resulta of Aerial Survey Fellewing
uInB SThotocccrecccccvccereccscvcceccessecce
Resulte of Aerial Survey following
- Cumulative fallout, extrapolated to January 1, 1953,
de shown on wape for the firet and secend 15 day periods afts>
MIEB ani for the next 3) days. Dispersion of the radioactive
cloud throughout the world atmosphere appears to have been
essentially completed during the second two weeks.
ZIM ccecccccevecesccovencccccsncccscesceces
Cumulative Fallout, United States,
Rxtrapolated to January 1, 1953ccccscesccee
Cumilative Fallout, Worldwide exoept
United
Staterecccccccccccccvcccvccccevccocs
Maximum Tndionotive Dust Concentrations
Cumulative fallout to January 1, 1953, exceeded
10,000 d/n/sq ft at five Looations and was in the hundreds or
low thousands at nearly every remaining station.
.
Bxtrapolated to Sampling Datecccosoccscccece
Concentrations of radioactive dust, measured in
air samples from 18 stations, were insignificant compared with
similar data from previous surveyse
Decay rates were approximately proportional to the
tee
1.4 power of the age of the activity, instead of the 1.2 power
found during earlier series.
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