appeared to be the pressure gratient ~tween Wake Id-and and Eniwetok.
When this gradient was of the order of two millibars, the winds becw
light and variable.
f. In the forecastingof shaer activity, the presence of the
typic~ tr~e wind inversion seemed to be conductive to shower activity
early in the morning when the nwd.mum amount of radiational cooling
has occurraL A minimum azmunt of shower activity seemed to occur
when there was not inversion. Typical examples of this phenomena
occurred on X-day when marked shower activity developed after an
almost clear ni~t, while on YOKE and ZEBRA mornings when there was
no inversion noted, no measurable shower activity occurred.
11. RadiologicalSafety Comuutation8
.
●
The radiologistwas responsible for declaring whether the wind
conditio~ were such that the atomic bomb could be fired wltho~
fall-out radioactive contaminationhazatis. The method of computation
of the co-called Safety Sector is based upon the speed and direction
of the upper winds and upon assumed rates of fall for various sizes
or radioactivedebris. Considerationshould be given to a mre
precise method for calculating the fall-out hazard taking account of
rates of diffusion awl dilution in the atmosphere aa well as tho
p~sical fall-out of radioactive debris.
,$
78
SECTION XXI