3.
4.
Use of film badge data at Rongerik to quantify the fallout building curve-
upslope and downslope, and to extrapolate this information to Rongelap and
Utirik.
Determine the 6/y ratio and thus evaluate the contribution of $8 dose in
estimating the y depth dose;
Neptunium-239,
5.
for example,
the 8 activity dose due to
Plot all the available data on external radiation and determine decay factors.
The question to be raised will be:
Do the data result in a curve similar to
the estimates T-1.5 relationship, or does it exhibit different values, such
as T-0.83,
6.
T-1.2 due to weathering or other factors?
Examine the question on internal dose estimations from, urine analysis,
food ingestion, inhalation and data from animal studies.
In this process all
available information on diet and lifestyle would be compiled so as to derive
realistic dose estimates from external and internal sources.
7.
Examine other studies done elsewhere on the thyroid nodules, for example; the
Chicago Group Study,
and also
the use of 1297
to determine the early thyroid
doses.
Historic samples collected soon after fallout will be used in determining the 129] concentrations.
In addition, 99Tc would also be determined since
it is known to be retained in the Shyroid gland.
If possible, excised thyroid
glands would also be studied
8.
for 1 “TY concentrations.
Use a "state-of-the-art" computer simulation program to determine the transport
and deposition of radioactive fallout following the BRAVO test.
This study
should give:
a.
plots of integrated air concentration isopleths for fission products
b.
iodine, cesium and strontium
deposition isopleths for the aforementioned fission products,
ec.
time plots of
239Np/239Pu if possible, and
pius
the buildup and decline of airborne fallout concentra—
tions near sea level at the points of interest, and/or the building
of ground deposited fallout.
Status of Study:
External Radiation Measurement
Figure 1 shows a plot of
the gamma dose rate in roentgens per
hour at three feet above ground at 24 hours after the BRAVO test
explosion.
Figure 2 shows
the estimated
and
for the Utirik inhabitants.
total dose contours in
roentgens at 96 hours after the BRAVO test explosion indicating
175 rads of whole body gamma radiation for the Rongelap inhabitants
14 rads
In view of these observations,
an exhaustive search of all reports generated Tables 2 and 3 for
Rongelap and Utirik respectively.
Figures 3 and 4.
OO
a
net
=
co
7
This data has been plotted in
These plots will be further examined when results
from Item 8 above will be received.
ma
fy
1.