Because the range of concentration
Several reasons explain the varia-
factors in only two combinations of
tion of concentration factors calcu-
nuclide, plant part, and species from
lated from associated plant and soil
the associated soil-plant data (pooled
data,
Seaevotla-Messerschmidta leaves for
physiochemical properties of the
IS tos and papaya leaves for aay
radionuclides under consideration,
varied by more than a factor of 20
soil. type and chemical characteris-
(Table 10), we use the median concen-
tics, in soil management practices,
tration factors derived from the
in irrigation practices, and in the
5
including differences in the
physiology, age, and prior history of
“associated data in our predictive
the plants sampled.
model.
Table 10.
in
It is impossible
Maximum-to-minimum ratios of associated soil-plant concentration
factors.
Species, Organ
oY
1370.
239,
5
240,
Secaevola, mature leaves
L.
10
---"
--~
..
23
4.9
2.6
leaves
3.
39
Pandanus, mature leaves
3.7
Coconut,
3.
Maximum-to-Minimum Ratio
Messerschmidtid,
mature leaves
Pooled Seaevola and
Messersenmidia, mature
x
.
Coconut,
mature leaves
tle
* onb
Fruit
< 7.
8.4
14
,
2.6
20
23
2.0
6.9
3.6
2.)
1.8
oo
---
30
7.9
Papaya,
mature leaves
6.
Papaya,
fruit
?.
9.5
1.7
1.8
Banana,
mature
2.2
1.6
3.2
3.8
Ll.
3.0
3.0
2.9
f ayy
tae
sreadf[ruit,
?
al
Wot
vw
Leaves
I:
mature
leaves*
detected.
Fruit'’ includes both meat and milk.
:
.
~
~24—