ial |
ava, [Set]
1.2
where,
A, = B activity on counting day
G
= Counting day
B
= Burst day
E
= Extrapolation day
3.
The sr fraction of the total beta activity on this day was taken
from modified Hunter and Ballou\® curves.
4.
The sr? activity values for the individual days were summed by
months and these sums added for the desired period, The same data
were also used to compute an infinity gamma dose ueing the calculation system described by Hallden and Harley (7
The data reported for fallout through September 195509) were based on
the above computations, but comparison of the estimated Srvalues with
available radiochemical data showed the method was inadequate.
fallout was older and contained a higher percentage of Sr°~
90
The actual
than the model
indicated.
A new model was then devised to take stratospheric debris into account,
and measured sr”,
fe mwennd
Tests of this model appeared to give reasonable agreement between estimated
This was the general system:
1.
Estimates of the yields of total fission products and of Sr? were
obtained for each weapon test.
2.
The total fission-product yield for each test was added to the
2
calculated fission-product residue from previous tests, (The T7~*’
law was used for decaying total fission product activity.)
3.
The combined fission-product yield was used to estimate an ef-
4.
The sr? activity from each test was added to the accumulated gr90
from previous tests. {No Sr90 decay was included)
.
5,
The sr? to fission-product beta activity ratio was computed and
applied to the measured beta activity on each sample.
Fe
fective burst date. This was used with samples following each
test to extrapolate from counting date to a fixed computing date,