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,
reference data for
samples whose decay curves appear in Figures 1-6,
regions in the
the
while the five
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
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
region.
Thus, from the first region under "Negative slope----" in Table 1 the
nearly straight-line decays are seen to be numbers 38, 41, 58,
81.
Similarly,
the
last
region contains,
among others,
and
those
en-
tries for curves that were linear from the period of the first region
through 2300 days after detonation.