Le
0021620
used in Shots Diablo and Shaste .24
The Coulomb C samples were surface
soil samples which, by definition, had no sampling bias.
The sample bias factors, q/q, are used in the next section, where
applicable, to increase the values of a (fissions/sq ft) for calculation
of M,(1) from I(1) and a/m values. For the stations at which I(1) was
not observed, the average value of the ratio, q/q, was used to increase
the FOD (fraction of device) per sq ft values and, by use of Eq.. 25, to
give estimates of I(1).
4.6
COMPUTATION OF K(x,W) FROM MASS CONTOUR RATIO DATA
The values of K(x,W) can be determined by means of Eq. 24 and the
observed or estimated values of M.(1). In order to increase the mmber
of data points in determining the dependence of K(x,W) on x, the I(1)
values were estimated for the stations at which observed values were
not available (i.e. mainly the floating stations for Operations CASTLE
and REDWING) by the method described in
Section 4.5.
In addition, .
correlations were made of the variation of the specific activity of the
fallout with distance from the data of Table 1.
Fig. 4.
These are shown in
The data are quite scattered with respect to variation with
distances; in the calculations, the empirical equations for Zuni and
Flathead were used but for Tewa and Navajo, the geometric means were
used.
Activity~-particle size data and specific activity data from
PLUMBBOB Shot Shasta are given in Figs. 5 through 7. The mean values
of the sizes and specific activities are summarized in Table 13 for
each station; these values and an «xtrapolated value were used in Table 1
for the calculated values of M.(1).
‘The very small amounts of activity
in small sizes (Figs. 5 and 6), if neglected, would result in distribu-
tion curves with a fairly small particle size range for each station.
In Fig. 7, it may be noted that, for the range of distances given, the
specific activity is nearly proportional to xi/2.
DOE/NV)
The values of K(X,W)/q are summarized in Table 14. For the JANGLE
and CASTLE data (except for Stations How and Victor), no correction was
applied for sampling bias since no estimate was available to apply to
the collectors used.
No bias was assumed for the PLUMBBOB data.
The
K(X,W)/q values are plotted against the 1 MT Scaled Distance in Figs.
8, 9, and 10; the 1 MP Scaled Distance was used to adjust the numerical
values of the distances for each shot to a convenient common range for
plotting.