rounded to three significant figures and lower activities to the nearest
hundred c/m. Dashed lines representing the 95% confidence bands of the
regression lines are also included.
are given in the figures, where:
The equations of the regression lines
A = median activity in well c/m at H + 300 (Shot 8) or H + 12 (Shot A)
Da == mean projected area diameter in microns
Dn == mean maximum diameter in microns
CONCLUSIONS
In view of the limited data no generalizations can be made; however,
the results do warrant the following observations:
1. An extensive range of activities is associated with each size and
size-type group. The field data indicate that the activities of a
size-type group containing 30 or more particles follow a normal distribution.
2. The field data also show that the activity of irregular particles
varies approximately as the square of the diameter, a surface area
function. For spheroidal particles the activity varies with a function exponentially greater than a volume function. In the case of
dendrite-like particles the activity varies with a function exponentially greater than the irregular particle function.
Approved bys
ER. Somplein)
E.
R.
TOMPKINS
Head, Chemical Technology Division
For the Scientific Director
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