PRIVACY ACT MATERIAL REMOVED”
percent.
We also note the most important contributions to the lower large
intestine, which is of interest because it's the organ that receives the
second highest internal doses by ingestion, and the bone marrow dose, which
is of interest because of the abundance of leukemia diagnoses.
Thus, among
the radionuclides that contribute five percent or more of the dose to the
lower large
intestine,
are
neptunium-239,
strontium-89,
zirconium-97, barium-140, and neodymium-147.
yttrium-93,
We recently added yttrium-93
to the list of nuclides because in reexamining our screening calculations
we noted that Y-93 did, indeed, contribute some two percent or more of the
10
total lower large’ intest ine dose.
11
that
12
contributing over 60 percent” to the total dose.
13
cesium-137, barium-140 contrfbute some five percent or more.
14
contributed
The
next
the most
viewgraph
For the bone marrow, among the nuclides
are
strontium-89,
(LRA-8) “shows
a
strontium-90,
collectively
lodine-131, tellurium-132,
similar
distribution.
Well,
it
15
shows the most important contributors to the thyroid dose to .
16
from all
1?
distributing radioactivity over St. George.
18
quite similar, as shown on the previous viewgraph (LRA-7), and this is not
19
surprising since HARRY was the major contributor to the total dose from all
20
events.
events.
Again,
21
I will
Six of the 31
events
contributed doses
go through this quickly,
by virtue of
Fractional contributions are
the most
important contr ibu-
22
tions to the thyroid dose are from iodine-131, tel lurium-132, and iodine-
23
133;
24
lower
25
zirconium-97,
26
contributors again to the bone marrow dose are strontium-89, strontium-90,
27
iodine-131, tellurium-132, cesium-137, barium-140.
28
and,
serially,
large
the most
intestine
barium-140,
As another example,
important
are
and
contributors
neptunium-239,
13
the
dose
strontium-89,
neodymium-147.
the next viewgraph
to
(LRA-9)
to
the
yttrium-93,
The “most
summarizes
important
the dose