-
Fish
13
-
9
2
2
The average concentration o £ 241an and 39,240 Pu is 0.11 and
0.25 pCi/g respectively (Ref.
1).
241 was non-detected in most
fish samples and the value 0.11 pCi/g represents the value obtained
when the detection limit is assumed to be a real concentration.
using 1.85 as the ~“!pu to 2399740 Pu
1.85 (0.25) = 0.46 pCi/g
ratio the
241
Again
.
Pu concentration is
2415
The maximum PATay which can grow in from this level of 24104 is
0.46 (0,026) = 0.012 pCi/g.
Relative to the present 241an concentrations
of 0.11 pCi/g this represents an 11% increase,
The total
241
Am will be
,240,,
O.11 + 0.012 = 0.122 pCi/g; compared with the 239
u of 0.25 pCi/g
this is 0,122/0.25 = 0.49 or 49% of the
239,240
Pu levels.
However, a more realistic situation is that the fish will always
reflect the same ratio of
water concentrations.
2h1
Am t
5 2392240
Pu
as they do to the present
Therefore, the increased
resulting from "grow in" from 24.4 will lead to
in fish which are 64% of the
239,240
241
2
:
Am water concentrations
#1 concentrations
Pu concentrations.
Sediment Concentrations and Ratios
The ratio of 24a to 239,240, u in lagoon sediments is 0.37 and
for the craters is 0,29 (Ref. 1).
These data will be shown to correspond
very well with ratios observed,in the soil.
The 24d and 239,240),
concentrations are 172 and 463 mCi/Km2 respectively.
The 241bu
concentration is therefore 1.85 (463) = 857 mCi/Km2.
The maximun
241 Pu is therefore 0.026 (857) - 22 mCi/km?, This
241an activity from
will be a 13% increase above present levels of 172 mCi/Km?.
The total
241am activity will be 172 + 22 = 194 mCi/Km? which 194/463 = 0.42 or
42% of the 2392405, activity.