Pon
monitors.
If two or three aircraft and aoproximately one dozen
traired personnel are devoted solely to radiation monitoring duties
it would be possible to delineate the general fall-out area adequately.
A complete fall-out map could be prepared from the air readings where
the contamination is given in relative units.
Then all that is required
is a few ground readings to change the relative readings of the fall-out
are
map to gamea roentgen dose values.
If this suggestion is accepted, it
should be kept in mind that air readings should not be utilized to deter-
baal
mine the contamination of such small areas ag ground zero etc., since it
is futile to attempt to pin point the cortamination of a given small area
from an airplane,
<dxperience also indicates that although the conductive
ity meter used in an airplane is very sensitive to contamination in the
air, the normal radiological gamma indicating instruments (MX-5 and T13)
are relatively insensitive to such contamination.
If conductivity meters
are used, the serial survey must be made 24 hours after shot tine to be
sure that the air is cleared of all radioactive fall-out (within 200
miles of ground zero).
If MX-5 or TI1B instruments are used the aerial
survey could start two or three bcurs after shot time.
The flight
pattern will be governed by the radex plot to keep the airplane out of
the path of the fall-out.
Historically “here is oaly one incident in
Which the MX=-5 or T1B instruments carried in the aircraft became contaminated during T/S or U/K Test Operations.
This occurred during T/S,
Fox Shot (see Reference #1) and is indicated in Mgure 2 of this report.
During the first shot of U/K (Annie) the radex plot showed a very
narrow path of fall-out, and it was indisated that the aircraft could
De
1-3
of
cms
Suu GLay
~~
UNCLASSIFIED
pal
2owe.
|