-_
Next viewgraph, please (LRA-17).
factors for jiodine-131 then.
This is simply a comparison of those
This is what is in use, or what we estimate,
for the dose factor for iodine-131 and extrathyroidal iodide concentrating
tissues.
For thyroid, we use a dose factor of 1.9 rad/uCi.
lactating breast our estimate is -- excuse me.
breast is 4.5 x 10-4 rad/uCi.
depending on our approach.
10-3.
For stomach,
here --
assuming
and
the
The dose factor for the
For the lactating breast we have two values,
1 x 10-3 or 3 x 10-3.
this
stomach
For the
is -as an
I
For salivary glands, 7 x
don't want
to emphasize
extrathyroidal
10
organ, total body, approximately 1 x 10-3.
lt
MIRD.
i2
ICRP-30.
iodide concentrating
These are the dose factors from
This is found in the Journal of Nuclear Medicine,
Now the next slide (LRA-18)
stomach
1975, and from
summarizes some hypothetical dose esti-
14
mates -- well, this is actually patterned after one of our litigants, and
15
the assumption is that she is a nursing mother.
16
values in our printouts, assuming the adult female.
17
we made a calculation for the dose from iodine-131 to the lactating breast,
These are the calculated
Breast, 0.024.
Now if
we would have -- from jodine-131 alone we would have an additional
19
approximately 50 percent to be added to this calculated value.
20
case
21
approximates the dose from all radionuclides to the total body.
22
of
the
salivary
glands,
we
estimate,
Now in summary then, the dose to extrathyroidal
23
organs from iodine-131
24
now will follow with various other items.
25
26
oh,
CHAIRMAN
MOSELEY:
29
And in the
millirads
there
questions
Thank you very much.
27
28
18
for
which
iodide concentrating
is very low relative to that to the thyroid.
Are
of
Dr. Ng
at
this
Lynn
point.