Table 21
Radioiodine and Radiotellurium Thyroid Absorbed-Dose Commitment per Unit
Activity Intake and Corresponding Age
rad uci7l4
Age
135,
134,
133,
132,
131,
132,,
131m,
Adult Male
Adult Female
0.056
0.067
0.0025
0.0035
0.26
0.31
0.013
0.015
1.4
1.7
0.22
0.25
0.16
0.19
Twelve-Year-Old
Nine-Year-Old
Six-Year-Old
0.12
0.16
0.21
0.0053
0.0077
0.011
0.56
0.75
1.0
0.027
0.036
0.048
2.9
3.8
4.8
0.46
0.61
0.81
0.33
0.43
0.55
In Utero, 3rd tri.?
In Utero, 2nd tri.?
In Utero, Ist tri.®
0.042
0.12
0.00
0.0021
0.0050
0.00
0.21
0.54
0.00
1.0
2.5
0.00
0.15
0.37
0.00
Fourteen-Year-Old
One -Year~-Old
Newborn
0.10
0.49
0.62
0.0041
0.46
0.026
0.032
2.3
3.0
0.022
0.11
0.14
0.0089
0.022
0.00
2.5
11
15.
0.38
1.9
2.4
0.29
1.3
1.7?
0.11
0.29
0.00
Multiply by 2.7 x 107? to obtain Gy Bq@!.
Per unit activity intake of the mother.
b.
Thyroid Absorbed Dose.
We compiled the product of age-specific in-
take (see Table 20) and age-specific thyroid absorbed dose per unit intake (see
Table 21) for several specific ages (Table 22). The thyroid absorbed dose from
all iodine and tellurium nuclides was 7.7 times the dose due to 13ly at Ronge lap
Island for an adult male. It was 10 times the dose due to !3!1 at Sifo Island
and 4.7 times the dose due to !3!1 at utirik Island.
The most probable ingestion dose evaluation by James (Ja64) for a
3.5-year-old Rongelap girl was given as 14.45 gray (1445 rad). James chose this
age because three teenage females were the first to develop thyroid nodules, 10
years after the acute exposure. James assumed the total thyroid absorbed dose
from ingestion of all iodine isotopes in fallout was 2.6 times the thyroid dose
due ¢..
1317.
this factor of 2.6 is dependent upon the age of the fallout and
the age of the individual and differs considerably from our estimates. Since
James based the total thyroid dose on 1311 measurements in urine and this factor
of 2.6, there is a significant difference in thyroid dose derived by our method
and that derived by James. Adjusting the James ingestion dose estimate by
multiplying by the ratio of 8.6 (our factor for a 3.5-year-old person) to 2.6 increases the total thyroid absorbed dose estimate of James to 47.8 gray (4780
rad). The comparable result for a 3.5-year-old, using our method and Johnson's
(Jo81) dose conversion factor, was 37 gray (3700 rad).
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