seen and the uranium,
fallout,
in this case,
as well, as if we talk about global
it's mainly due to thermonuclear explosions which produce a very
large neutron flux and substantially change the ratio of plutonium-240 to
-239..
Now, from the Test Site, we essentially have all
fission devices
that did not produce such large neutron fluxes, so that's the basic reason
why the- ratio of plutonium-240 to -239 is different for the Nevada material
as opposed to global fallout.
The next viewgraph (LRA-45) are some material from EML that I won't go
through in any_gfeat detail.
It's been presented a couple of different
10
times, but, just ta emphasize that this technique has been worked out by
11
EML that you can cateulate the ratio of (total) plutonium from Nevada to
12
that of global
13
the ratio of plutonium-245to -239 in your sample and then you know what it
14
should be for global falloutand what it should be for Nevada fallout.
15
Going through this arithmetic,—you ran calculate on the basis of these
16
measurements
17
global
18
provided us as the constants for the Nevada fallout and for the global
20
and
fallout
19 fallout.
if you measure several different things and that includes
those
in
knowns,
theratio
of
that sample,
andthese
are
plutonium
the
from
values
that
EML
and
has
You see that the ratio from the twe-sources differs by about a
factor of 6.
.
The next viewgraph (LRA-46) is simply an extension of that.
21
Nevada
The other
22
equation is that the total plutonium in the sample has to represent the sum
23
of the two sources; combine that equation with theather one, and then you
24
can come up with the amount of global fallout in that—sample and then, what
25
we really want is now this number, whereas if we know the global plutonium
26
in that sample,
27
plutonium in global fallout, shown there, and then we can, indeed, calcu-
28
late
this
and also the total cesium, we know theratio of cesium-
number,
which
is
the
number
191
we
need
to
drive
our
dose