All the corrected G-M tube gamma radiation readings
obtained by the survey team are given in Table 1 for each
measurement site along with all other total exposure rate
data obtained at that site.
Although some beta plus gamma
radiation readings were taken these data were inconsistent
and are not reported.
Thermoluminescent Dosimeters - A large number of thermoluminescent dosimeters
{TLD}
were used during the survey.
NRDL
contributed the majority of these detectors.
The predominant
type used was a piastic capsule filled with LiF powder and
enclosed in styrofcam inside a smali plastic box.
This type
of dosimeter was piaced every 100 ft. (measured) along each
of the major transects cn Bikini and Eneu Islands.
Total
exposure rate measurements were also made at each site.
dosimeters were left in piace apprcximately ten days.
remained aboard ship.
readout after the trip.
The
Controls
Both sets were returned to NRDL for
The results are given in Table I in
terms of the net average expcsure rate over the time of
exposure.
There is some question as to whether these dosimeters
were shielded adequateiy from beta radiation.
This lack of
adequate shielding might partially expiain the slightly
higher average exposure rates cbtained from these dosimeters
at survey sites relative to the other instrumentation at the
same sites.
NRDL also expcsed several lew background CaFa2 :Mn
dosimeters at varicus locations cn Bikini and Eneu.
These
dosimeters and controls were returned to the Naval Research
Laboratory in Washington, 6. ¢. for readout.
Although the
metal case surrounding the dosimeter, which is used to
flatten the energy response, should eliminate most of the
B-ray response, these results also appeared to be slightly
higher than results
from the other
instrumentation.
However,
the total doses to which these dosimeters were exposed were
relatively smail and the time between exposure and readout
was quite long.
This resuited in the necessity of sub-
tracting sizeable background readings.
In addition, there
was usually oniy one dosimeter per monitored location and
thus only one readout available per site.