good Aafini*iom both of the fallout front aml of the total feallsut
was obtainet,
With the eessntion of the probe an7 monitor mountet on the boom
of the YAc-40 all instrumante aboard the three project ships were
operated during the fallout period.
The YAG-40 occupied a position
close «o the estabilishei line of maximumfallout ani raceivet a
large quantity of fallout material (TCA = H 4 34, sprroxinately):
peak sheervet intensity on ch» deex, however, wis only ebout 9r/hr
(H 4 7),
Samples were shtsinnt by che Special Incremental Collecto-
until well hervrond reak activity ant al] latoratory stuiies panne!
for early times (activity measurements, physinal obse-wations, iecaye
ani gamma spectra) were performet; these data are currently being reduced and will be rero-teid when awailable.
It is clear, howewer, ‘ha’
_ the 6412 suffice Cor a comparai‘vely ietaile characterization of the
fallout at this location,
established
The YAG-39 alse occupied a position on the
line of maximum fallout, tut for reasons not cleurly unjer-
stood, received only a relatively light fallout (THA =H £ 123, aprooxdmately); the intensity on tne Jeck 411i not exceed 40 ar/hr (H 4 26).
The reatings of af] instrumeats were corsistent, however, and good de
finition of the fallout at that point was ottaine’.
Jt was, for exaarie,
observed that after the first peak was reachel, norm) decay dij not
Occurs insteat the activity built up to a second peak, tren began te
decay, indicating a secon} arrival of primary falisut.
Tt was later es-
tatlished that the wind structure had ecllapse! during this reciod, an?
4t 1s believed that the data obtaine! on this vessel may enable an eventual analysis of th: behavior of fallout unter such coniitions.
Due to
the collapse of the winds prior to the expected tine of arriwal of fallmm 2m Te
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