39
. Beagles.
Physies
igh June
n of Bas:
diological
ugh June
Atherton,
d Radon
(7 (1958),
‘trometry,
HO.
H. Com-
and Bats
al Labo-
Report,
‘etention
> (1958).
abolism:
iple but
Theoret.
ie Variahe Dog,
unlikely. However, metabolites do travel along the ray
tracheids, tritiated water enters heartwood, and in
coitwoods fission products are found in wood formed
prior to the existence of bomb fallout.‘®
This paper reports on the use of *1°Pb tracer to estimate the rates of radial translocation of lead in trees.
Also measured was 7!°Po, which gives an indication of
the transport of this nuclide. These nuclides occur in
nature and are derived from the °8U chain which de-
exvs to “°6Ra and then through a chain of short-lived
daughters to 2°Pb, which has a 21.4-year half-life.
This nuclide then decays to 5-day 7!°Bi and finally to
TABLE 14.
which,
nd acmeasent of
ted by
y and
2s and
ncient
ced at
lina
s type
1s
28
Bar
1-2
0
1.5
48
as
GS
7
5-6
7-8
9-11
12-14
xs
Ys
15-16
17-18
lls
12S
38
indiod is
0.83 + 0.10
2.09 + 0.29
5.5
7.5
10.0
13.0
0.261
0.221
0.184
0,207
0.202
0.176
0.239
0.2388
0.77
0.80
1.29
1.15
19-20
15.5
17.5
19.5
0.192 + 0.017
0.221 + 0.017
0.268 + 0.020
0.170 + 0.026
063 + 0.11
2)-23
24-25
22.0
24.5
0.2690 + 0.018
0.266 + 0.022
0.238 + 0.025
0.254 + 0.040
0.88 + 0.11
0.95 + 0.17
3.5
0.214 + 0.019
26.5
28.5
33.0
36.0
38-39
0.271
0.250
0.208
0.240
38.5
+
+
+
+
+
+
+
+
0.024
0.017
0.017
0.017
0.021
0.020
0.017
0.019
0.148 + 0.018
0.192 + 0.026
+
+
+
+
0.042
0.023
0.025
0.032
0.280 + 0.027
0.269 + 0.026
0.196
0.227
0.221
0.081
+
+
+
+
+
+
+
+
1.46 + 0.19
122 + 0.15
0.027
0.043
0.03
0.03
0.72
0.91
1.06
0.34
0.266 + 0.048
+
+
+
+
0.12
0.19
0.20
0.16
1.86 + 0.38
0.178 + 0.019
0.202 + 0.019
0.157 + 0.042
0.164 + 0.043
0.88 + 0.26
0.81 + 0.22
20S
JES
2S
44-45
46-47
48-49
44.5
46.5
48.5
0.142 + 0.017
0.179 + 0.019
0.058 + 0.011
0.167 + 0.018
0.216 + 0.042
0.110 + 0.042
0.076 + 0.026
0.146 + 0.041
1.562 + 0.34
0.62 + 0,24
1.31 + 0.51
0.87 + 0,26
JEN
25S
§2-53
54-55
52.5
54.5
0.138 + 0.018
0.124 + 0.017
0.103 + 0.014
0.194 + 0.044
0.146 + 0.041
0.126 + 0.035
1.41 + 0.37
1.18 + 0.37
58-59
60-61
38.5
60.5
02.5
65.0
0.119
0.0902
0.080
0.085
0.146
0.104
0.125
0.086
1.22 + 0.38
71.5
75.0
78.5
0.077 + 0.031
0.88 + 0.38
0.069 + 0.010
0.055 + 0.009
0.051 + 0.008
0.064 + 0.026
0.071 + 0.028
0.089 + 0.021
0.92 + 0.39
1.29 + 0.47
0.76 + 0.42
0.045 + 0.007
0.061 + 0.007
0.042 + 0.012
0.048 + 0.012
0.93 + 0.30
0.79 + 0.22
0.046 + 0.021
0.082 + 0.017
0.92 + 0.44
| 1.08 + 0.23
50-51
PAS
278
28S
30
SS
318
KNE
ENE
ENE
338
3008
oF
38 Center
50.5
56-57
|
56.5
62-03
62-07
64-05
70-73
- 73-17
77-80
78
79
80
84-86
88-92
90-95
100
;
64.5
85.0
90.0
92.5
100.0
0.016
0.013
0.012
0.010
0.087 + 0.018
|
78.0
79.0
80.0
+
+
+
+
'
~
~
|
;
0.053 + 0.007
0.085 + 0.007
0.050 + 0.008
0.086 + 0.010
0.057 £ 0.008
+
+
+
+
1.22 + 0.38
0.041
0.083
0.031
0.017
1.14 + 0.40
1.56 + 0.44
1.01 + 0.23
0.0386 + 0.012
0.69 + 0.24
0.086 + 0.021
0.073 + 0.0L}
Mean
0.265 + 0.016
0.082 + 0.009
0.17
0.12
0.18
0.18
40.5
42.5
23S
RapCa
0.90 + 0.15
40-41
42-43
3308
S48
iving
Ratiosponmen
Iss
19 8
ments
yf the
on of
»°Pb, 7°Po ann #6Ra 2ONCENTRATIONS IN Hiexory
0.192 + 0.021
0.329 + 0.029
26-27
28-29
32-34
35-37
17s
328
roots
excretion, and that the input rates are constant, the
“40Ph, concentration would decrease with its 21.4-year
radioactive half-life as one goes from the younger to
the older wood (outer rings toward the center).
0.233 + 0.014
0.157 + 0.017
3-4
138
4s
los
lis
iounts
r the
rable
222Rn, may be easily translocated, the “!°Pb moves
through the biosphere independently of its predecessors. Although the origins of the stable and radioactive
lead in the tree may differ, one would expect that after
entry their metabolic behaviors would be similar, if
not identical. Thus, if we assume no circulation, no
Sinplenunber] Ageing, ateanase, umn nciig ary mpo,pctiedty
IOS
n par; could:
138-day 7°Po. Because of their different chemistries
and because the radioactive rare gas intermediate,
2.15 + 0.63
| 1.28 £ 0.32
!
—
1.11 + 0.34 (S.D.)
:
.