EXPOSURE RATES CALCULATED FROM SOIL SAMPLE DATA
1188
127s
1, 386
1, 246
'. 286
nuclide
ere
not
ill be
&° Co
+25 ch
Clearing Experiment Area
Total activity per em*
4200 pe
90 pe
600 pe
Calculated from concentra-
240 ur/hr
19 wprf/hr
24 ur/hr
tion in soil sample
Inferred from field spectrum
52 wr/hr
6 uwr/hr
9 ur/hr
Percentage of total exposure
B4%
8%
6%
77%
9%
14%
<.6
74
rate based on soil
mmediate
could
ince
ground
athering
out
radiation
analysis (see p. 11)
Percentage of total exposure
rate from field spectrometer and ionization chamber
data
Core activity (pc/gm)
10 feet north of center
30 feet north of center
74
251
3.4
26
2d from
Long
vals.
1 an
sy of
-buted
st 3
ites
ling a
le,
The percentages of the total exposure rate due to each isotope
were calculated as discussed in Section II
(p. 11) and agree
reasonably well with the field spectrometric data in contrast
to the calculated exposure rates which are quite high, much
higher than could be explained by the excess activity from
3 - 5 inches.
The core data also given in the table illustrate
the large local variation in the total activity which is
probably the main reason for the high values for the calculated exposure rates.
This cleared area was resurveyed two weeks later upon
Island.
The exposure rate measured at the
center of the area was essentially the same as before (59.6
wr/hr).
Additional measurements were made around the edges
return to Bikini
wt: $
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