RESULTS
Figures
collected in
1-6 show graphically the decay rates of
1951
and
1952.
Logarithm of radioactivity is related
to log of time after detonation.
legend of the figures.
104 samples
Detonation date is stated in the
The graphs do not show absolute levels of
radioactivity, (although
this may be computed by reference to
Table
1) but rather permit a comparison of decay rates between samples.
Table 1
lists, in the left-hand portion,
samples whose decay curves
appear
reference data for
in Figures 1-6,
while
the
the
five
regions in the right-hand portion give measurements of slope as
scaled from the graphs in such a manner as to consider most of the
major inflections of the curves where observations were sufficiently
ssiphadhepe
frequent.
Inflections of curvature might of course also be expected
during the periods when observations were not made.
The slopes of
the straight portions of the curves were tabulated in the region that
seemed chronologically most appropriate,
except that if the entire
curve was straight, the data were entered only in the first
Thus, from the first region under "Negative slope----"
nearly straight-line decays are seen to be numbers
81.
Similarly,
the
last region contains,
region.
in Table 1 the
38, 41, 58,
among others,
and
those en-
tries for curves that were linear from the period of the first region
through 2300 days after detonation.