We
estimated only by predicting the cloud trajectory to determine
whether the cloud has passed a specific area.
There is generally
little residual radioactivity deposited on the ground fram these
clouds.
Records of cloud passage are obtained by mobile ground
monitors in addition to routine monitoring of large off-site areas
near the test site.
Milk
Milk collections have been made in the vicinity of NTS, and
the samples analyzed by the U. S. Public Health Service, under
contract with AEC.
Tables IV, V, VI and VII present the highest
concentrations of I-131 detected in milk during the indicated time
periods.
In July 1962, the wind trajectories of radioactive clouds
from five nuclear tests passed over the Salt Lake City area.
Three of these clouds are known to have deposited residual fallout
activity in this area.
Iodine-131 was detected in milk supplies
for a short period of time.
The tables show that while the peak
value of I-131 in milk in the Salt Lake City area was relatively
high, the average levels over a period of time were considerably
below those considered to constitute a health hazard, based upon
previous studies of effects of I-131 upon human thyroids.
.
DOE ARCHIVE
For ex-
ample, the station showing the highest yearly average (Salt Lake
City with 102 micromicrocuries of I-13l per liter of milk) might
result in a one-half roentgen exposure to the thyroid of young
children and lessor amounts to adult thyrolids.
ae
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