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EXPOSURE RATES CALCULATED FROM SOIL SAMPLE DATA
137 as
G2 AG
~25 oh
Clearing Experiment Area
Total activity per cm’®
4200 pe
90 pe
600 pe
Calculated from concentra-
240 ur/hr
19 ur/hr
24 uwr/hr
tion in soil sample
Inferred from field spectrum
52 ur/hr
6 wr/hr
9 ur/hr
84%
8%
6%
77%
9%
14%
Percentage of total exposure
rate based on soil
analysis (see p. 11)
Percentage of total exposure
rate from field spectrometer and ionization chamber
data
10
(pc/gm)
feet north of center
30 feet north of center
74
251
ww A
i or
Core activity
74
26
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, mich
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
return to Bikini Island.
The exposure rate measured at the
center of the area was essentially the same as before
ur/hr).
(59.6
Additional measurements were made around the edges