However, a group of film lad,a readings was obtained covering a
range of values which vaiied with exposure conditions (Reference 3),
These readings are suinarized in Tatle 2,3,
th outdoors and indoors.
Several badges were worn
Oue badge which remained outdoors over the
28.S5-hour exposure reached tha upper limit of 93 r given in the table.
eS oa
Several other uauges kept inside a refrigerator indcors gave the lowest
value of 33 r. Skin contamination in the Hongerik group appeared to
have been much reduced by the protective measures taken and the resulting beta doses appeared clinically to hava teen clearly lower than in
2 ey iy Fe ee
the other groups,
TABLE 2.3 = Pile Badge Readings on Hongerik
a
oo
During the period 3 to ll March, mre extended surveys of each of
the islands were made by a monitor! e team equipped with five AN/PDR=39
Twenty-four hours previous to the departures
of the su rvey party, three of the instruments were calibrated on an
8O~curie Co
source and cross checked at 0.320 r/hr, where they were
found to be in close agreement, Using these instruments, measurements
were made in the inhabited areas of all four islands at waist height
(approximately 3 feet above ground), Table 2.4 1s a summary of these
data, Since these later readings were made under better controlled
conditions than the emergency surveys at the times of evacuation given
in Table 2,2, the data of Table 2.), vere taken to be the best measure-
ment at a given tine of the gamma dose rates in air and were used in
the calculation of the total external canna dose.
No information existed on the qusntity of beta contamination on
the skin of any of the exposed individuals,
Further, no experimental
data allowed any reliable calculation of the beta dose rate to an
individual fran fission products on the greund, Thus the only basis
for any estinate of external Leta dosage was data from other field
teats and fallout measurenents, This question is discussed further in
Chapter 6, and a rough estinata for possible beta dose from ths ground .
is made there,
*
a
tae
.
Ls
yt
feo
Ce
Ba
LATER SUHVEXS
instruments (Referanea hh),
fe
fe,
oO
2 oa
Inside RefriperatorIndoors
2.3
d ohay See eg
leek.
:
TR Leaky
ie
Se
gah:
Outdoors only
hh to 52
at
oy
Indoors and Out
“Oo
ca
ed ad
Location of Badges Pee |
Calculated
Dose to Badges (r)
4 ee
ee eee+
°