DR. ANSPAUGH:
Could I have the first viewgraph?
(LRA-19).
This is
just to reemphasize what Dr. Ng mentioned about the calculation of the dose
from ingestion, which was the subject of his presentation.
—
It's basically the multiplication of these four terms, and the next
thing
that
was
to be considered was
the
estimate
of
uncertainty;
and
speaking. specifically about the litigants, we were in a position at the
time thatwe made the calculations for the litigants of not having the
input from Dr. Hicker 's model in terms of his estimate of uncertainty.
we estimated .the’ uncertainty
10
in
these
estimates
based
upon
a
So
somewhat
different approach.’That's shown in the next viewgraph.
(LRA-20).
il
We made: the assumption, which is quite reasonably justified
—_
12
on the basis of other studies reported in the literature, that all of these
13
factors were lognormal ly. distr ibuted; and we estimated their dispersion, or
14
their geometric standard deviation, as shown on this slide.
15
measurements of mR/hr, 1.5 jis zFeasonable, fairly conservative number of
16
the actual calculated geometric standard deviations that we got from the
1?
DRI
18
d/measurement of mR/hr at a particular location.
19
number.
20
that number was exactly known.
21
how to calculate exactly the deposition of a particular radionuclide per
22
unit of external exposure rate.
23
through in a little more sophisticated method, we wil] examine the actual
24
variations in that term.
- 25
folks
when
they
looked
at “Tocations
which
had
more
Now the
than
one
This is our source term
For the purposes of this calculationzat the time, we assumed that
In other words,that we did, in fact, know
Now that is not quite true.
As we go
—
Now this is the one that really drives the uncertainty, the transport
26
through the food chain.
On the basis of some work done-by people at Oak
27
Ridge, Hoffman and Baes in particular, they looked at radioiodine transport
28
through a food chain, through the cow milk food chain.
37
Their estimate of