1.12
Other Continental United States Sites
Monthly fallout collectors are maintained at other sites within
the continental United States.
Exposed surfaces of the collectors are
0.82 et? except at Lemont, Ille (0075 rt") and Richmond, Calif. (4.91 rt").
At Pittsburgh, Pa., Westwood, N. Je, Houston, Texas, and Richmond, Calif.,
two collectors are exposede
Table 2 summarizes the most recently analyzed monthly
collections.
The 3r99/gr90 ratios have been extrapolated to the midpoint
of the collection period.
The cumulative levels of strontium 90 for each
site are plotted in Figure 2, pages 19 and 20,
Explanation of Brror Terms in Table 2
The counting error is shown in the column “mc gr99/miee and
4e used to compute the cumulative error term when only one collector is
exposed.
For two collections, the standard error of the mean is
incorporated into the cumulative error terme