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pilot personne) of hasardous radiation intensities which might exist.
The proper
performance of these instruments is critical to the success of the mission in that
the radiation safety of the pilot and the operational guidance of the mission are
it is desired that the Air Task Group pro-
determined by their relative readings.
Vide the necessary personnel and dehumidified field facilities for the storage,
calibration, pre-flight test and maintenance for these instruments and the associ-
_ ated electronic circuitry in the aircraft.
-
1.
Radistion Exposure Dosimeter (Intepron)
With thorough pre-flight tests and calibrations the "integron,"
develooed for 1VY by LASL proved to be satisfactory for the operational control
of exposure.
Thies unit is electrically self-contained.
If F615 aircraft are
used, its position should be changed to a location nearer the pilot than wes
used on IVY.
2. Semple Redistion Intensity Meter (Wing Tenk or Chamber)
ooo
The radiation rate from the samd+le which is measured instantaneously by an ionchamber in the right wing tank was found in IVY to provide
very valuable immediate information on the effectiveness of a sampling aircra‘t
during its sammoling mission. This instrument requires 28 volt DC and 115 voli,
hOO cycle AC power from the aircreft as vell as suitable wiring between the cockpit and wing tank.
Experience with the electrical leads and connectors supplied
in IVY POG airereft indicates that the circuitry for this instrument must enploy
water and moisture proof cables and connectors in order to avoid serious functional
difficulties arising from the saltemoisture conditions typical of tropical marine
Clinstes. l° the IVY F8lG's are used in CASTLE it is desired that all wiring and
connectors be replaced as required to assure reliavle performance at Eniwetol.
de
Cockoit Radiation Intensity Meter
Toie rate moter measures the cloud radiation intensity and guides
the pilot in the oerformance of tha penetrations. It also controls the tota.
radiation exposure and duration of samplinc by msasuring the background radiation
intensity acquired by the aircreft as s result of surface and engine contamination.
.
As a result of lack of tropicalization and ruggedness the IRM-?72 (Jasper) suoplied
for use on IVY proved to generallyunsatisfactory. It is suggested, therefors,
that the Jasper be replaced by a more suitable instrument which is more rugged.
reneeyeelized, and otherwise meets the specifications established for the Jasper
ore
e
c.
Pilot Radiation Protection
Experience in IVY indicated that personnel shielding of nominal
iead equivelence provides a significant radiation protection even for gamma rediationz from © pure fission device. Although the personnel shielding equipment
provided by the Air Task Group for IVY was effective, its cumbersome nature
appeered to give rise to psychological difficulties incident to emergency exit
or beilout from the aircraft.
It ie suggested, therefore, that this equipment
be redesigned for CASTLE to achieve esimslicity and safety and that it be used
particularly on tests of devices in which tuballoy is a major constituent ar
from which a high flu: ef soft ganma radiation can be axpected, It should be
/ COPIED/Doe
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Kee
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