Dr.
Bugher
lay
13,- 1958
Calculations of Dose to Thyroid
yp
Assume:
inhalation and/or ingestion of Sx 103
fissions
At D1 there are 0.017 d/m/10 “OO fissions
or 8.5 x 10! d/a/S x 108 fissions
or 38.3 pe intake of 1131
or1.4 x 1012 atoms intake of2.
(Average energy 0.22 Nev)
pose (reps) =
—(1:35_2 dor Hriosz2N(2.6 x 197)
= 255 eps
# Correction for biological decay.
pise
Assume: inhalation and/or ingestion of 5 x 10 £9 ssions
at D4 1, 12 intake is 1.1 x 10 etons
The average sean energy of yi32 4s about 0.55 mev or 2.5
times that of yl,
Thus, the energy equivalent to 1131 would be
(2.1 x 10")(2.5) = 2.75 x 10% atoms of 1232
However, due to the short half-life of yis2 (2,4 hrs)
assupe that the energy equivalent of 1.5 x 10**
atoms
of 1431 reaches the thyroid.
1
Thus, the ratio of doses rz 9.0
“me
“>
Panton tha
te 12