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TABLE I
Factors for Converting Air Concentrations of Radioiodine
to Thyroid Dose via Inhalation*
(mrem/yrper pCi/m?)
Age
I-129
1-130
I-13)
1-132
I-133
1-134
1-135
Tyr
20.8
2.22
20.4
0.250
5.05
0.0637
1.12
4 yr
10.7
1.2]
10.6
0.135
2.59
0.0343
0.598
14 yr
«(17.5
0.880
0.0824
1.91
0.0237
0.413
Adult
36.3**
1.01
0.109
1.99
0.0273
0.471
*
8.53
10.4
Breathing rates assumed: 1-year old, 5.6 m3/d; 4-year old,
7.0 m3/d; 14-year old, 13.5 m3/d; adult, 20 m3/d. Organic and
inorganic forms of radioiodine give the same dose via inhalation.
**
Dose in first year.
Maximum dose rate after equilibrium is
reached between thyroid burden and intake rate would be 1.09
times this value.
Revised May 1976
.
To change ty and t for short half-life radioiodines per ICRP Publ. 10.