Table ll.
Comparison of soil-root and soil-leaf concentration factors.
Concentration Factor, (pCi/g dry plant)/(pCi/g dry soil) ~
90...
Species
Roots
Pandanus
0.88
_
137 a,
71
239, 2405,
Roots
Leaves
Roots
Leaves
1.0
23
17
0.44
0.015
0.77
1.2
26.1
0.45
0.022
Messerschmidta
0.59
0.48
33
0.44
0.35
Coconut
0.16
QO.11
2.3
0.085
--—
0.89
_-->
0.88
O.14
--~
0.30
0.30
5.7
L.l
0.081
--o
0.89
—->
5.0
0.38
-“--
0.425
1.10
0.026
0.027
0.006
Banana
a
Leaves
.
2.9
50
3.4
16
---
0.54
Root and crown.
Below minimum detection
Jimit.
consider it to be a valid sample and
fruit sampled from this species are
have used it in our dose predictions.
0.76 for 906. and 7.0 for Polos,
Breadtruit — Breadfruit were not
available on Enewetak Atoll.
Papaya — The ratio of maximum-to-
Thus,
minimum concentration factors calcu-
data from the two samples collected
lated
during the 1975 Bikini survey provide
the
leaves is
small;
.
first directly measured concen-
tration factors.
for mature papaya
As expected from the
median concentration factors
90.
137
are 1:3 for
Sr, 3.1 for
Cs, and
239, 240
Concentration
0.0018 for
°
Pu.
1972 Bikini survey? and from the sta-
1
factors of 0.43 for
ble element analysis of potassium and
Thee, and 0.0018 for 239,240), | are
calcium in the Enewetak survey,
calculated for the four papaya fruit
of
90
sr and
13?
uptake
:
Cs by breadfruit is
available.
Banana ~ The only data from the
Preliminary concentration fac-
tors of 1.8 for
and 0.027
90
Sr, 1.6 for
1975 Bikini survey on radionuclide
Cs,
concentrations
for 239, 240 Pu are assigned
mature leaves.
The two available
samples suggest
tentative concentra-
to mature breadfruit
centration
L37
Say
8.2 for
?¢
high and comparable to uptake by Pandanus.
Ie
Sr,
Factors
leaves.
for
the
one
The con-
.
tion
mature
—27-
in banana are for
factors of 0.73 for
90.Sr,
9.42