TABLE 4
TABLE 3
PLUTONIUM CONTENT, o % 238pu, AND CONCENTRATION RATIOS
PLUTONIUM CONCENTRATION AND CONCENTRATION RATIOS
OF VEGETATION FROM THE ORNL FLOODPLAIN
OF WHEAT STRAW AT VARIOUS TIMES DURING THE GROWING SEASON
Sampling Month
Pu
a
.
(pci g™!)
a % 238py
Pu Concentration
Vegetation
March
05
38
2.3.x 107?
April
-02
61
9.3 * 10
June
-09
58
4.2 x 107
a
b
(pci g@!)
CR
Tree
2x 107?
6x 10°?
Shrub
1x 10°?
2x 1074
Herbaceous
--2
5 x 10
2 x 10
Native Plants
+3
Vegetable Crops
Foliage
-~1
1 x 10
Soybean
1 x 10
Tomato
3x 107!
5 x 1073
-1
2 x* 10
-3
Bushbean
2x 10
-3
Fruit
Snapbean
6 x 10
-3
—4
1x 10
Shelled bean
9x 10>
1x10"
Tomato
5 x 10°?
1x 10°"
Soybean
4x 107
7x 1074
Soybean (minus pod}
3x 1073
5 x 10°
"Values are means of 3 to 24 replications; standard errors typically
range from 20% to 50% of mean estimates (Dahlman et al., 1976).
b
CR = [Pu] gg/(Pul
soil.
“cR values of cultivated crops are based on soil concentration of
63+ 0.4 (S.E.) pci g!.
312
313