.
OFFICIAL USE ONLY
De
R Where: D ® dose (1.0 rad)
Ne
R « dose rate on initial day
- Aez effective decay constant (Radiological
and biological)
1.0 #R
0.09
™
R = 0.09 rads/day
Step 2.
Determine the number of microcuries of zi31 to produce
0.09 rad/day
X(uc) (2.2 x 10°) (60 x Pk) (1.6 x 1076) (0.22) = 0.09
(100) (20)
X = 0.16 pe to thyroid
(0.16) (5)= 0.80 pe 1134
Step 3.
sted
Determine relative doses from yi3l and pshort
according to Graph Three."
At 48th hour, the relative contribution to total dose
from 73+ ana PT 4s about.
131
Therefore, ingestion of 0.4 ue I~
1
(equivalent) at 48th hour
will produce 1.0 rads to thyroid. |
Step 4.
Determine ‘the number of microcuries of fission products
required to yield the requirea T/3+ activity. At 48th
hour, p31 constitutes about 2.35% of total activity.
one
Therefore,
0.4 =
0,023
17 we of fission products.
Graph Four shows the number of microcuries of fission products ingested at times after detonation to produce 1.0 rad to the thyroid.
OFFICIAL USE ONLY
-? -