ABSTRACT
The activity of coral fallout particles was studied as a
function of individual size. Single particles from two shots
at Operation REDWING were sized and identified as being of a
spheroidal, irregular or dendrite-like type and then measured
for gamma activity. Two particle size parameters were employ-
ed, equivalent projected area diameter (D,) and maximum dia-
meter (Dm) « The study shows that an extensive range of activities is associated with each size and size-type group. Field
data taken at one station indicate that the activities of a
size-type group follow a normal distribution. According to
the same data the activity varies as Dao? and Dnt? for irreg-
ular particles, D,3°! for spheriodal particles, and D,@+1 for
dendrite-like particles.
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