With,
Gross Beta Air Activity
.
At the present time, there are 28 permanent air sampling stations in operation surrounding NTS.
The data recorded by these
air samplers is used by the off-site monitoring group as an indiecator of the presence of airborne radioactivity in that area.
These data indicate the presence of radioactivity and the need for
further monitoring but are of no direct value in assessing radiation doses.
For purposes of illustration, the ten highest levels
found in the srea are listed in Table VIII.
Isotopic Air Results
The relative quantities of various isotopes in air are obtained from isotopic analysis of samples taken by prefilters and
charcoal cartridges.
Some of the highest values determined for
T-131, I-133 and I-135 are shown in Table IX.
Water Supplies
Gross beta water monitoring is conducted for water supplies
used by people in the off-site area around NTS.
All sources moni-
tored are subsurface supplies, except for Lake Mead.
There are no
known surface water supplies for human use in the nearby off-site
area.
The highest levels of gross beta activity in water supplies
DOE ARCHIVE
during the period of October 1961 to October 1962 are listed in
Table X.
For comparison, there has been selected same other high
level data fran the U. S. Public Health Service on radioactivity
in raw surface water in the United States.
es
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