spatial (horizontal) distribution in the nuclear cloud.
lateral diffusion of the cloud.
A correction is applied for
For an increase in cloud area in direct proportion to
time, the concentration of fallout particles is inversely proportional to time. The rate
of deposition with time (T) is of the form:
cT7te-alT~b)
2
Parameters a and b are chosen to match the meter reading of 100 mR/hr at 7.9 hours
and for the central 90 percent of the deposition to occur in 5 hours. The normalization
to total deposition is provided by c. Fallout accumulated through time t is represented
by the time integral of the above expression.
The choice of the lower limit of
integration is not crucial; the observed time of fallout onset is satisfactory.
The
complete expression for intensity with time is then:
2
t
1, = 62.71O81? «3og ff yr be 0237-116) gz
7.4
3)
Figure 2 depicts this relationship, which serves as the basis for the dose calculations.
The peak intensity of 7 R/hr occurs at the end of the estimated interval of significant
fallout (9 to 14 hours).
(2)
Personne! Activities on Rongerik Atoll, 1-2 March 1954
After being evacuated to Kwajalein, each person who was on Rongerik was
interviewed to determine his specific activities during the period 1 March until
evacuation on 2 March.
Other pertinent data concerning their exposure conditions
were also obtained such as clothing worn, food and drink consumed, and their
recollection of what the fallout resembled.
(Reference 3) is used
memorandum.
in
A synopsis of all of these interviews
reconstructing the radiation exposure estimates in
Seventeen of
the
interviews were
in
sufficient
detail
that
this
the
individuals' activities during the exposure period could be fairly well established on an
hour-to-hour basis.
For intervals without specified activities, reasonable assumptions
are made that high-side the calculated radiation doses.
example of
the
information available and
reconstruct the dose for one individual.
the
The Appendix contains an
procedure employed
in
order
to