Given these
entire island an exclusion area—off lim-
current conditions, it must be assumed
its to all people, or (2) conduct a cleanup
surrounding coral matrix,
that pure plutonium particles of respira-
campaign which will eliminate the "hot-
ble size are now also present on the sur-
spot" plutonium problem and remove
face or may be present in the future as
whatever amount of soil is necessary to
weathering effects oxidize and break
reduce the soil plutonium concentration
down the larger particles,
to a level comparable to other northern
Lung dose
assessments for this area, therefore,
islands.
As an indication of the volumes
must be based on inhalation of pure plu-
of soil involved, removal of a 10-cm
tonium particles rather than those hav-
thick layer of topsoil in the area in which
ing the average plutonium content of the
"hot spots" have been detected involves
soil,
approximately 17,000 m? of material.
Further removal of soil to reduce the
The potential health hazard via the
inhalation pathway is sufficiently great to
maximum plutonium contamination levels
dictate two basic alternatives for reme-
to 50 pCi/g or less involves an additional
dial action for this island:
Table C.
25,000 m°® of material,
(1) Make the
30-yr integral doses from all pathways compared to U,5, external background dose.
30-yr integral dose, rem?
Location
Unmodified soil case
Bone
W.B.
Modified soil case”
W.B.
Bone
Enewetak Atoll living
pattern II] (JANETcurrent conditions)
11
80
8.9
78
25
4.2
23
Enewetak Atoll living
pattern HI (JANET-
pandanus and bread-
fruit imported)
Enewetak Atoll living
pattern III (JANETall agriculture confined to southern
islands)
Enewetak Atoll living
pattern I (southern
islands)
U.S. background only
6.5
4,2
7.0
1.9
4.7
1.0
3.8
1,0
3,8
3.0
3,0
3,0
3,0
“Sum of all pathways for the Enewetak living patterns (i.e., external, inhalation,
marine, and terrestrial),
BSoit modified by placing 2 in. of clean gravel in the village area and plowing the
agricultural area.
“Based upon background of 100 mrem/yr at sea level.
I-3