oo
C+
ey
|
every 150 ft.
.
:
a
-
eae
.
~~“
2850 ft. transect.
-.
:
- ou.
meinenae = eae RS eeme ce eh aaee nneeeee anneaoe
:
t.
cen
~
-
|
(8)
Geiger counter readings were recorded
-
Ionization chamber anc field spectrometer
~
y
Measurements were made near the beginning of the transect
-
and at areas along the transect where the survey meters
aoe
indicated significantly high or low levels.
:
at
.. .
_
4
.
-
Se
The measurement _
f
points in Fig. 2. have been enclosed in dotted lines to
on
illustrate the general nature of the variation in radiation
e—
levels across the island.
The exposure rates along the
transect and for Bikini Island in general were 20-40 ur/hr
near the shore, 50-80 ur/hr in che interior, and up to 120
ur/hr at scattered hot spots.
The field spectrometer
measurements showed the exposure rate levels on Bikini
Island to be Gueprimarily to three racionuclides, with
about 75% of the exsosure rate at a given site due to ?+37Cs,
-
15% to ®°Co, and 10% to +#5Sb.
Co
&
thorium, and votassium) were almost entirely undetectable in -523
the field spectra.
.
Natural emitters
Py
(uraniun,
.
fe
el
This is not surprising since the coral
soil of the atoll is predominately Caco, .
— :
De
.
a
he oa
aa
|
Representative exposure rates in air 1 meter above the
é:
-
ground fromy-ray emitters in the soil obtained from the
:
analysis of the field spectra and ionization chamber measure-_
The measure-
we
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Sat
ments on Bikini, Zneu and Nam are given in Téble 1.
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