FOOD-CHAIN KINETICS OF RADIONUCLIDES
765
Table 1— AVERAGE GAMMA DOSE RATES, Ry, AND AVERAGE CONCENTRA-~
TIONS OF “Sr IN PLANT SAMPLES AND IN THE BONE ASH OF RABBITS
COLLECTED FROM DIFFERENT PARTS OF THE SEDAN FALLOUT FIELD
AT VARIOUS TIMES AFTER THE DETONATION*
Study
areas
Groom
Valley
Initial gamma
Days
ratest_
__dose
x
sx
45.0
+30%
after
n
detonation
5
Valley
16.8
445%
5
4059
+303
5
30
1544
+50%
5
5
|
Railroad
Valley
Currant
Area
All areas
6.8
+32%
5D
_Pe “Sr/g (dry)
SX
15
5
39
x
60
Penoyer
Plant samples,
2716
+38%
30
60
+41%
2283
552
+61%
+34%
5
5
397
£3667
£51%
5
5
15
+42%
1363
+37%
+39%
+44%
1459
+74%
948
332
283
SX
3581
5
5
2024
+14%
5
164
127
+19%
+30%
269
+30%
x
3648
+38%
470
89
—_pe MSr/g (dry)
5
788
15
30
60
n
Rabbit bone ash,
+13%
n
5
+62%
5
5
5
5
+37%
5
334
+30%
5
5
5
783
462
+33%
+33%
5
5
#5
620
5
5
+68%
5
1.5
+33%
5
5
15
30
60
318
183
136
55
+20%
+23%
+18%
+15%
5
5
5
5
295
323
427
280
+54%
+31%
+26%
+31%
5
5
c
c
17.5
+30%
20
5
15
30
60
1436
909
544
313
+32%
+37%
+40%
+32%
20
20
20
20
863
1680
2097
1389
+29%
+38%
+30%
+34%
2¢
2¢
2¢
2¢
30
+17%
14
56
+30%
1e
Pre-Sedan concentrations
*X = mean, SX = Standard error expressed as a percentage of the mean, an:
n = number of samples. (Based.on data given by Martin and Turner.)
+Rg = mr/hrat 3 ft aboveground at H + 24.
When P, or Sy, Bt, and A, aregiven, the parameter values required
to solve Eqs. 4 to 6 are Wy, Wi, Tp, T,, T., fo, and f,. Some of these
parameter values can be obtained from experimental results reported
in the literature, and others can be obtained from the data given in
Tables 1 and 2, For our purposes those obtained from the field data may
be more accurate,
Various studies?®?” have indicated that adult jackrabbits consume
approximately 100 g of dry plant material per day; therefore W, = 100 g.
Unpublished data collected during this and previous studies!’?’"8 indicate
that the average adult jackrabbit in Nevada weighs about 2000 g and
has a skeleton weighing 200 g (fresh). Since the ratio of fresh bone
weight to bone-ash weight is approximately 4 tol, Wb = 50 g. The ratio,
W,/W, = 100/50, indicates a feeding rate of approximately 2.0 g of dry
plant material per gram of bone ash per rabbit per day. The feeding