culate the estimated cesium that came from the Nevada Test Site, we can go
back to our standard source term calculations and we can, indeed, calculate
in a reasonable way the short-lived radionuclides that came with the cesium
that were responsible for the dose, and, again, just to emphasize, it's the
short-lived radionuclides that are responsible for the dose
and not the
cesium. The cesium is our track of what's still there and we can measure
with contemporary measurements.
Once we know Number 2, we can then cal-
culate Numbers 3 and 4 with our standard methodologies.
"The next viewgraph (LRA-43)
indicates the two methods that EML has
10
come up with and successfully demonstrated in Utah.
11
basis of the current measurements, the total cesium that's in the soil now;
12
and if we have a reasonable idea of when it got there, we can, of course,
13
calculate backward how much was there originally.
14
that global cesium primarily comes down with rainfall and that if we do
15
know
16
equation that EML has developed to estimate the global; and then the cesium
17
that
18
global.
19
deposition
20
-239.
21
the
rainfall
came
from
at
Nevada
a particular
is
location,
simply the
If we know, on the
The first method assumes
we
difference
can
use
between
a regression
the
total
and
The other method is based upon current measurements of plutonium
as well
as
the cesium-137 and the ratio of plutonium-240 to
The next viewgraph (LRA-44) is an indication of why that ratio should
22
be different for global
fallout
as opposed
to that that came from the
23
Nevada Test Site,
24
the bombardment on uranium-238.
25
the more plutonium-239 is created from uranium; and at the same time if you
26
have created plutonium-239, you leave it in the reactor, and you eventually
27
build up levels of plutonium-240 by two different methodologies.
28
of plutonium-240 jis a reflection of the neutron flux that the plutonium has
and, basically, plutonium-239 is made in reactors with
The longer you leave it in the reactor,
190
The level