ee,
good definition both of the fallout front and of the total falleut
was obtained.
with the exception of the probe andj monitor mounte? on the boom
of the YAG-40 all instruments aboard the three project ships were
operated during the fallout period.
The YAG-40 occupied a position
close to the estabilished line of maximum fallout ani received a
large quantity of fallout material (TOA = H # 34, approximately);
peak observed intensity on the deck, however, was only about 9r/hr
(H £ 7).
Samples were obtained by the Special Incremental Collector
until well heyond peak activity and all laboratory studies planned
for early times (activity measurements, physical observations, decays
ani gamma spectra) were performed; these data are currently being reduced and will be reported when available.
It is clear, however, that
they vill suffice for a compsraiively detatled characterization of the
fallout at this lccaticn.
The YAG-39 also occupied a position on the
established line of maximum fellout, but for reasons not clearly under-~
stood, received only a relatively light fallout (TOA =H # 124, approx-
imately); the intensity on the deck did not exceed 40 mr/hr (HK # 26),
The readings of all instruments were consistent, however, and good de~
Finition of the fallout at that point was obtained.
It was, for example,
obeerved that after the first peak was reached, normal decay did not
occur; instead the activity built up to a second peak, then began to
decay, indicating a second arrival of primary fallout.
It was later es-
tablished that the wind structure had collapsed during this period, and
it is belicved thet the data ottaine? on this vessel may enable an eventUal analysis of the behavicr of fallout under such conditions.
Due to
the collapse of the winds pricr to the expected time of arrival of fall-