indications that the arbitrary system was in error, the activity wes
reassigned to the appropriate burst. In the case of observations in
the Pacific and adjoining regions, it was usually possible to
determine the burst responsible for the activityfrom an examination
.
decay correction.
*
of the trajectories of the debris in conjunction with observed
increases in radioactivity. Elsewhere in the world, it was ordinarily
necessary to use the arbitrarily assigned burst. All maps of daily
fallout values indicate the burst assignment used in computing the
Unless otherwise indicated, all radioactivity is
reported in units of disintegrations per minute per square foot of -1.2
gummed film, decayed to 100 days after the day of the burst. The t
law for the decay of fission product
activity has beenused throughout.
The mans of. daily fallout include only the data from the land
stations, since there is considerable uncertainty in the ship dats.
The locations of the ships were imperfectly known and the procedures
for avoiding cross-contamination of sammles in handling and mailing,
particularly on shins exposed to heavy fallout at some time during
their voyage, were not adequate. The shin data were utilized in the
drawing of isolines of activity on the fallout mans and in the
interpretation of the land staticn data.
,
.
aw
A