under present U.S. standards.
Areas G, F, etc., have decreasing levels.
Superimposed on this figure are locations of the soil samples taken.
These samples will not only provide further detailing of the extemal
dose but will establish a basis for determining a part of the food
chain uptake of radioactive isotopes.
In addition to the aerial and
soil surveys, we have taken many samples of the lagoon water and
bottom as well as the flora and fauna throughout the atoll.
Figure 4 is another example from our aerial survey, showing Engebi (or
Janet) Island.
Only the contours are shown on this viewgraph.
In order for the AEC to determine the total dose to man, we must know
something about how he lives.
Consequently, as a part of the survey,
we are conducting a lifestyle study.
We will attempt to detail the
food chain as well as living, working, and recreational habits of
the people.
This lifestyle study is the bridge between a mass of data
and the physical effect on people.
Figure 6 graphically represents the progress of the survey analysis as
of June l.
As you can see about 4,200 separate samples were taken from
the atoll and are being analyzed.
Except for the water samples, each one
must be dried, ground, tagged, and packaged, a process labeled preparation.
Once prepared, the samples receive a gamma analysis/ are asSigned a
number which is entered into a data bank.
From there they are sent to
one of the participating laboratories where detailed chemical analysis
will determine the levels of such isotopes as
239
Pu,
137
Cs,
60
Co, and
90
Sr.