1000
106
‘
CoN TECRATIGCNS FER MINUTE FOR 10.000 FISSIONS (0,M)
(CAPTURE TO FISSION
ur (9:007
TIME (OAYS)
Figure 3.15 Calculated beta decay.
surveyed part of the patterns. These values do not include the fallout deposited near the
excell and are considered to be lower limits.
2.6
UPTAKE OF FISSION PRODUCTS BY ZOOPLANKTON
A small subsidiary project was undertaken during the Shot 5 water survey, consisting
of collecting a few samples of zooplankton. These were sent back to the Scripps Institu-
tion of Oceanography for classification and counting and to the Naval Radiological Defense
Laboratory for radiochemical analysis. The results of these experiments indicated that
{13 the feeding mechanism of the crganism affected the amountof activity assimilated,
‘2) the solid phases were concentrated in preference to non~particulate matter, and (3)
there was no evidence of fractionation of isotopes in the assimilated material.
57