330 Nuclear Forensic Analysis
yield a complex and heterogeneous milieu of radiochemical species that would
p
resent
e
xtraordinary
c
hallenges
f
or
d
econtamination
e
fforts.
The
m
agnitude
o
f
t
he
r
adiation
b
ackground
o
f
a
s
pent-fuel
s
ource
m
ay
b
e
a
ppre-
ciated
f
rom
t
he
f
ollowing
d
iscussion.
C
onsider
a
s
ingle
3
.6-m
f
uel
a
ssembly
f
rom
a
p
ressurized-water
r
eactor
(
PWR)
t
hat
h
ad
b
een
i
rradiated
f
or
3
0–35
G
W-d/MT.
Even after 5years in a cooling pond, this fuel burn-up would result in residual radia-
tion
t
hat
p
rovided
a
w
hole-body
d
ose
o
f
~
5000
r
em/h
at
1
m
(
i.e.,
a
h
uman
L
D
50
in
~
5min).
D
oubling
t
he
c
ooling
t
ime
t
o
1
0years
w
ould
d
ecrease
t
he
e
xposure
r
ate
t
o
o
nly ~3 kR/h at 1 m.
The
p
otential
t
arget
p
ool
f
or
t
heft
o
r
t
errorist
d
estruction