HN
Now the next viewgraph (LRA-27) is a list of all of the other radio-
Ww
nuclides that we had previously considered for the lung only, and these are
-
the dose to the gastrointestinaltract.
arranged in order of decreasing dose commitment.
Plutonium-239 is essen-
tially a trivial dose to the lung, and we've only done a few calculations
forit forcompleteness.
This gives us a total of 46 radionuclides that we
have considered in these calculations, not counting plutonium.
The next -yiewgraph (LRA-28)
indicates an ordered
procedure that we
followed for’ these calculations in terms of where we get the air concentra10
tion data.
11
available as our first choice, mainly because of the important input that
12
gives us in terms ofparticle size and thus entry into the lung dynamics
13
model.
14
that
15
made and reported in the literature, so from PLUMBBOB on all we have is the
16
high volume sampler data.
17
assume that the activity median aerodynamic diameter was 10 micrometers,
18
which is probably quite a conservative assumption, at least in terms of a
19
lung dose; perhaps not in terms of doses to internal organs.
20
.
‘Wehave always used the cascade impactor data where it was
Now if we don't “have a cascade impactor data, and you may recall
after TEAPOT there were “no cascade impactor measurements generally
In that case what we have typically done is to
Now if we have neither of these kinds of data available, what we have
21
done is to use data from the closest town that did have such data,
22
we've simply ratioed the activity measured there according to the mR/hr at
23
the two different locations.
24
So the next viewgraph (LRA-29) indicates again what we've done.
and
Where
25
particle size data are available, this is no longer reatly proposed, this
26
is what we did particularly for the litigants.
27
less than 20 micrometers, we would use the ICRP lung model directly in
28
terms of entering it.
If we ever- found a diameter
This has never been the case where we have an aero-
4]