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TABLE 2
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Fallout Particle Composition
Element
Weight in
Fallout Sample
Fe
53-7
165
Ca
34.3
106
(mg)
Weight in
Fireball
(tons)
264 +
Computed Weight of Original Minerals in Fireball
(tons)
-
264
layer
layer
part
cente
miner
of a
(Cacos)
Ba
2.21
6.8
11.6
Ti
O45
Led
2.3
ar
0.25
O77
1.5
AL
0.16
0.50
3.04) (xa1si.,0g)
(a)
parti
1.25
(BaS0))
(Ti0o)
(ZrSi0,)
Corrected for weight of Al in tower.
The question arises as to how much of this material, especially of the
large quantity of coral sand, was vaporized and how much only melted. It
is known from an examination of the thin sections that part of the calcium
oxide in the fallout particles occurs as an inactive, residual core and
was originally melted but not vaporized. However, most of the calcium oxide
in the particles occurs in combination with the iron oxide and it is not
possible to tell whether this part was originally vaporized and condensed
with the iron or whether it was part of the original liquid drop and merely
dissolved and reacted with the condensing iron. The existence of radioactive fallout particles consisting essentially of iron oxide (magnetite)
indicates that relatively little of the calcium oxide wes vaporized. If
there had been appreciable amounts of the calcium oxide vapor it would presumably have condensed onto the iron oxide drops as well as onto the cal-
cium oxide drops. The fact that X-ray diffraction analysis detected no
calcium compounds in the iron oxide particles shows that the amount of
vaporized calcium oxide was small.
A qualitative spectrographic analysis was made of a sample of the iron
oxide fallout particles and the characteristic elements from the tracer
minerals were found in them. As none of the tracer minerals were ever found
embedded in any of the particles, their occurrence suggests they were probably vaporized to some extent and condensed onto the particles.
It is also
possible that some of the small tracer mineral particles were drawn into
the fireball and impacted on and dissolved in the liquid oxide drops.
12
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