RESULTS AND DISCUSSION OF RADIONUCLIDE ANALYSIS
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Fission product separations (see UWFL-33 for techniques) ”
and gamma spectrometric determinations were made on plankton
samples collected during the Walton and the Marsh surveys.
Plankton samples collected from the Walton in June 1956 were
anslyzed chemically June 30 and August 29 of the same year.
Similar samples collected from the Marsh in 1956 were analyzed
poth for fission products and certain radioactive non-~fission
product isotopes during the last week of December 1956 and the
of
first week of January 1957.
‘In addition to the chemical analyses, gamma spectrum
curves were made on two Walton plankton samples, one of whiohk
was collected just north of Bikini Atoll (station 9D), and the
other in the open sea (8C) about 65 miles northwest of Bikini
Atoll.
In general,
the observed percentages of total beta activi-
ty contributed by the various fission products,
corresponded ap-
proximately to those expected on the basis of the Hunter and
Ballou curves +
Of the Walton sampies,
chemicsl analyses were made on
plankton from nine stations: 1E, 3A, 4D, 7D, 8A, 9A, 9C, 9D and
ose dt DSeckebteticRE Tae Lecknateae in
ts
1UB (Table 5).
Variation in isotope percentages is great be-
tween samples and no definite pattern of variation is evident
between the different collecting areas.
If the averages of all
Banples are compared with the expected percentages (based on an
average 50-day interval following detonation), the results are
“3 follows: