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of such exposures for Operaiics areenhouse is, -ty 1400
¢mr.—HS Tho maximum that would be
acquired had been estimated as 1,190 mr. The
as usual, the film badge. Film oadges, with
films for Japtan indicated a mean of 1,040 mr
records indicating to whom each badge wasisand a range of &25 to 1,600 mr, where the
sued, are stored at Los Alamos for reference
in the event of any claim against the governmaximum had been estimated as 1,310 mr. The
maximum value for Japtan was estimated from
ment which might arise in the future.
For personnel living on islands or ships at
survey meter readings which were about 10 per
Eniwetok Atoll, the external radiation exposures
indicated in Figs. 2.7 to 2.13 must be increased
by the contribution of the fall-out, particularly
after Dog and Item shots, bearing in mind the
fact that personne) doing routine duties, sleeping, and eating indoors would receive only one
third to one half of the dosage measured out in
the open. It would be extremely difficult to
estimate accurately the total exposures received by these personne! since film badges
were not, in general, worn on homeships or
islands.
cent greater than those on Parry. No comparable data are available from Eniwetok Island,
but survey meter readings made early in the
fall-out showed intensities of about two thirds
of those on Parry.
2.7.2
Following the fall-out from Dog shot, cumulative dose data were obtained on Parry using
photographic film badges and pocket ionization
chambers. The readings were taken near the
In all cases, exposure records of personnel
radiological safety building after a survey indicated that this was a representative area.
Readings were discontinued on 14 May 1951
when the decay had reduced the daily dose to
20 mr.
Figure 2.8 shows the cumulative doses due to
the fall-out from Dog shot and the subsequent
lighter fall-out from Easy shot. The figures
given represent doses which would have been
received out-of-doors. Doses actually received
were less than the figures given, depending upon
the daily activities of the individuals.
working in radioactive areas were scrutinized
after each day’s operation, and persons who
approached or exceeded established tolerance
levels were so informed and cautioned not to
enter radioactive areas for certain lengths of
time. In general, cooperation of test personnel
with radiological safety instructions was excellent.
2.7.1
Cumulative Radiation Dose Due to Dog
Day Fall-out
Dog Shot
In the early phasesof the fall-out after Dog
shot, radiation levels inside buildings were
from one third to one half those found outside.
To determine maximum possible integrated
radiation doses, film badges were exposed outside the rear of the radiological safety building.
These badges were replaced at 24-hr intervals
and were supplemented by pocket dosimeters
when decay had reducedthe levels of activity.
The build-up of the Dog day fall-out is shown
in Fig. 2.1. Cumulative dose data are shown in
2.7.3
External Radiation Doses to 27 April 1951
An analysis of all radiation exposures as
shown by photographic film badges was made as
of 27 April 1951. The exposure data presented
represent only that obtained in various missions
Fig. 2.7. Assuming decay according to t™'** and no
loss from leaching, the maximum doses expected
can be calculated as 2,210 mr to D+30 days and
2,705 mr to D+60 days.
Film badges were given to a group of monitors
in TU 3.1.5 with instructions to wear them atall
times except on missionsto other islands. A
similar group of badges was issued on Japtan.
These films were developed on D+3 days 10 hr.
The films indicated for Parry a mean doseof
connected with tests Dog and Easy, Thetotal
radiation exposures will be higher than those
given by about 1,600 mr, which is the estimated
average integrated exposure received from the
fall-out after Dog shot.
Film badge exposure data was available from
2,323 individuals and showed an average radiation dose of 355 mr. Excluding the three films
mentioned in Sec. 2.3, the total doses ranged
from 0 to 4,700 mr. Figure 2.9 showsthe distribution of doses and indicates that a large
number of persons received doses from 0 to
100 mr. This was due to two factors: First,
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