
453Counterforensic Investigation of U.S. Enrichment Plants
of
231
Pa. The
231
Pa content of the Paducah samples is so severely reduced that it seems
l
ikely
t
hat
w
ater
w
as
us
ed
i
n
t
he
p
rocess
t
hat
r
esulted
i
n
t
he
d
ispersal
o
f
t
he
m
ate-
rial.
B
oth
s
amples
w
ere
c
ollected
w
ell
a
bove
oor
l
evel,
i
ndicating
t
he
p
ossible
us
e
o
f
p
ressurized
w
ater.
B
ecause
u
ranyl
uoride
(
UO
2
F
2
, the product of the reaction of
U
F
6
with moist air) is also water soluble, it is likely that the process U loss calculated
e
arlier
f
or
t
he
P
aducah
s
amples
i
s
a
ctually
a
n
o
rder
o
f
m
agnitude
t
oo
l
ow
a
nd
t
hat
P
ortsmouth and Paducah both suffered from process losses on the order of 1 ...