Chapter
4
DISCUSSION
4.1
”
FISSION PRODUCT ANALYSES
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en
Fission-product data
for the events indicate that the close-in debris
was not seriously fractionated. In some cases, the long-range results
differed considerably from the close-in results; however, no clear-cut
pattern of variability of isotopic ratios with distance from origin site
is displayed by the data.
4-2
RARE EARTH ANALYSES
With the exception of Shot 3, which cannot be considered 4 represent~
ative thermonuclear event, the rare-earth ratios were relatively constant,
even though the yield of the events ranged from 2 to 14 megatons. It
appears, then, that the rare-earth ratios can be used only in a qualitative
manner to indicate a thermonuclear event. For example, if the heavy~
element, data shows that plutonium fissioning notsignificant consideration, ro
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re
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J
a
eo es ee
[However,LRD Eu!58/sm!53, Tb '!¥%Sm'53, and
Tbiéi/Eu 156 ratios for Shot 1 are consistent with the close-in results within
the limits of reliability of the data.
It was not possible to determine Ga? on LRD samples because of its
low fission yield and short half-life.
37