fe
Joout with
rormation of soveral sovereign states within this region.
are also
’
the
Hes
Data
included for some of the central and southern Marshall
Islands which were reached by U.
S.
Denartment af Energy field
trips ships.
oO
Field measurements
of external
radiation were conducted with
4
a pressurized ion chamber environmental radiation monitor,
and
Dy in situ gamma spectrometry with (3 cm X 53 cm) sodium iodide
scintillation detectors.
Soil samples were also collected at
most of the measurement sites.
These were later analyzed in
gq
the laboratory for gamma emitters by high resolution gamma
spectrometry; and for ?*Sr/?°Y, and in some cases 737, ?*°Pu
et
The primary purpose of the in situ gamma spectral
easurements
3
het
Gy
XJ
9o
Data on strontium
Lae
bk
107)
ct
>
ke
a)
Qu
inc!
As
ct
oO
re
-
and transuranics
po
by radiochemical separation and counting.
was to provide a data base for energy dependence corrections
for the stainless steel-walled ion chamber detector.
<aAs a
result the measurements were made at low resolution (100 KeV
per channel) from 0 to 2.5 MeV.
A programmable calculator
was used to fold the gamma spectra into the ion chamber
response characteristic to correct for energy dependence in
the environmental radiation monitor.
Coerrection factors were
typically about +5
The ion chanbder instrument presented tre instantaneous exposure
rate digitally in LR/hr based on samplings of the ambient