low level
lifferent
made in
uaboratory,
-antiated
ider
such
-opes
luring
ig the
> B-rays.
radiation
5
1
This
fadiation and neonatal death rate and birth weight.**
studies.
his
for
area
control
a
as
used
was
particular area
ing shown in Table IV the few sites surveyed varied very
little in total natural emitter dose rate.
forrelation with Aerial Survey Data - Measurements were made
in the Alamagordo, N.M., area with a group from the ARMS*°
lbrogram to enable these investigators to correlate their
In
aerial spectral measurements with our ground data.
addition simultaneous ground measurements by the ARMS group
with an air-filled plastic-walled ionization chamber were
made to calibrate its response against our instruments.
|
parison with Continuous Monitoring Experiment - Measurements were also made at the Texas Instrument continuous
The
monitoring gamma spectrometer site’* at Dallas, Texas.
total natural emitter dose rate at this site was quite low.
The individual natural gamma and fallout gamma emitter
neir
L
ambers*
between
nstruments
concentrations at this location inferred from our measurements
agreed very well with the values estimated by Foote of Texas
ber
easurement in High Uranium Area ~- In order to verify our
238U series dose rate calibration, measurements were made
should
ch measure-
es of the
Thus a
njunction
with these
chamber
ng this
New York
Instruments.
t the Lucky Mick uranium mine near Carlile, Wyo.
The site
was a flat cleared area previously used for storage of ore.
he soil was thoroughly permeated with uranium ore and thus
pproximated a very thin slab source distribution of very
igh activity.
The consistency of the various dose rates
Hetermined Spectrometrically and by ionization chamber
Measurement substantiated our 238U series calibration.
er in
Intercalibration of Detectors
ht
-
Nebraska
h
Our 1965 field measurements, besides giving us the
Opportunity to carry out a number of major investigations
under varying geological and radiological conditions,
Plso allowed us to substantiate our limited laboratory
Calibrations of our new 4" x 4" detectors by comparing their
response in the field against our well calibrated 5" x 3"
evels
Hetector.
zing
In particular the wide range of potassium,
AYanium and thorium dose rates encountered allowed us to
Obtain good energy band equations for the new detectors.
eT Fe
Fe