RELATION OF INDEX PATTERNS TO FALLOUT PEAKS
471
Table 1— VALUES OF [100(C, — C,)]/At COMPUTED PRIOR TO
THE FINAL SMOOTHING OF C AS SHOWNIN FIG. 1*
Dates
Feb. 6 to 13
[100(C, — C,)]/At
Fallout
0.7
None
Fallout
Fallout
None
2.0
2.4
3.0
None
None
4.0
3.0
Fallout
None
3.0
3.3
None
None
May 15 to 21
3.0
3.0
None
Fallout
3.4
3.5
None
May
June
June
June
June
4.3
1.3
8.0
4.7
5.0
Fallout
None
Fallout
Fallout
Fallout
3.6
3.6
3.8
4.3
4.7
Fallout
Fallout
Fallout
Fallout
Fallout
July 27 to 31
Aug. 5 to 12
2.4
8.3
3.6]
3]
3.5
None
Fallout
Produced one
4.9
4.9
5.0
Fallout
Fallout
Fallout
Aug. 15 to 17
Aug. 22 to 29
Sept. 2 to 9
3.4
4.9
3.3.
None
Fallout
None
Feb. 19 to 22
3.6
[L00(C, — Cy)]/At in
ascending order
0.7
None
Mar. 25 to 27
2.0
Apr. 7 to 10
Apr. 18 to 21
May 7 to 10
Mar, 1 to 4
Mar. 18 to 21
May 2 to 4
26 to 30
6 to 9
12 to 14
19 to 22
28 to July 5
July 7 to 10
July 13 to 16
July 20 to 23
Sept. 17 to 23
3.3
9.7
6.0
8.4
Fallout
fallout
increase
Fallout
1.3
3.3
None
None
Fallout
Fallout
{s6.0
Fallout
Fallout
-8.0
22
8.4
Fallout
ratiout
Fallout
9.7
Fallout
*Calculated values are arrangedinitially by date and then according
to ascending orderof calculated {100(C, — C,)]/At. The word ‘‘fallout”’
signifies that a fallout maximum was observed shortly after the index
decrease, and ‘‘none’’ denotes that no subsequent fallout peak was
observed.
in 1960,
1958,
more than a year after the voluntary test moratorium of late
Since radioactive debris in the stratosphere decreases with time
as a result of natural decay, it appears to be advantageous to express
fallout values in terms of intensities adjusted to an arbitrary age, This
has the advantage that similar mass-transport processes at different
times will produce a more comparable measured radioactive-debris
intensity in the troposphere. Also, this adjustment may lead toa
more accurate determination of the relative time rate of depletion
of the stratospheric-debris inventory as a result of stratospherictropospheric exchange mechanisms.
The rate of decay of the 1963 debris was determined by analyzing
the time change of the relative contribution of each specific nuclide and
taking into account the resultant change in mean half-life of the debris
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