a.
the fact that 5, 10, 15 and 20 roentgen intinity dose fall-out areas
are shown in the Figures, it appears that in some farming areas the
Strontium 90 concentration may be as hizh as 0.5 to 0.75 curies per
square mile from one shot.
In areas where the fall-out from several
shots are superimposed, the concentration could be higher.
However,
it is more significant to note that the areas wnere there is appreciable
concentration of Strontium 90 are relatively large.
from 1000 to 5000 square miles for each shot.
These areas range
for greater details con-
sult the figures and the information contained in Table I.
It seems
apparent to the writer that the immediate area of the Test Site and the
farming comminities in the periphery of the test site (within 150 miles)
may be examined profitably to determine the uptake of fission products
by plants and animals, and for the effect af fission products on relatively small water supply sources.
It is hoped that the radioactive
fall-out areas indicated in this report would be useful along these lines
of endeaver.
The experience gained in this study indicates that in or-
der to determine the world wide contamination pattern or even the percentage fall-out of rasidual activity in the Jnited States relatively large
number of sampling stations must be utilizad.
As indicated in Paragraph
II, F above, when tha fall-out covers @ Large area and if the intensity
of the readings are low, there igs a tendency to overestimate the percentage fall-out.
activity.
This is even more so in the case wher) rain brings down
if such readings are averaged ovar large areas by the use of
hh en dee
planimeters, the percentage fall-out msy7 52 highly exaggerated,
C3-36417