Gorpon M. DuNNING
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April 1956
badges as they went about their normal
activities in adjacent comnuunities. Outof-door radiation doses were calculated on
the basis of the survey cata of monitoring
teams shortly aiter fallout (as would be
cone in emergency situations); these were
later compared with the doses indicated
on the personnel film badges. The ratio
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See text for assumptions.
with multiroom single-story concrete block
of doses measured on film badges to those™
calculated for out-of-doors generally fell
between 0.4 and 0.5. Duration of exposure ranged from two to three weeks.
On the basis of these data the dose with
values.
Since the duration of the ex-
area may be conservatively estimated at
the effect was undoubtedly due principally
to shielding rather than to weathering
effects. Limited data were also collected
for personnel—school teachers, physicians,
mechanics, and others—weanng film
sons fully exposed for twenty-four hours
each day.
One may combine the assumptions made
for weathering and shielding and arnve
at a family of curves which estimate the
school buildings. The ratios of out-ofdoor to indoor doses ranged from 1.3 to 7.
As‘anticipated, one-room frame buildings
generally provided the least protection,
’ buildings falling within the upper range of -Shielding during normal occupancy of an
posures was generally less than one week,
25 per cent less than that received by per-
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hour at time of fallout.
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Estimated average accumulated gamma radiation doses for personne!
continuing to live normally in a contaminated area, based on a dose rate of lr per
een
Graph 3.
(DAYS)
kJ)
,
.
DURATION OF EXPOSURE FOR TIMES IMMEDIATELY FOLLOWING DETONATION
oe,
the Nevada Test Site, a number of film
badges were placed outside and inside
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buildings or natural terrain features and
on the length of stay at a particular place.
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accumulated radiation dose may be observed, dependent upon the location of
personnel in relation to different types of
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