. 427
=
SHUTTER
In the delayed shutter exposures,
retinal burns,
6 of 16 rabbits sustained
The lesions vere produced mostly in cases vhere the
exposure included the maximur or near maximum flux of the second pulse.
Increments of the flash beyoni 0.6 seconds did not produce burns in
this event.
sTupTss
Burne produced tehind filters at URIAH and VAN at 3.0 and 3,8
miles, respectively, were sixiler in sise anid appearance to blink
reflex lesions sustained on 7APTAN (DAVID) at
ground sero,
distance from
VYrom this it is inferred that the filters reduced the
Calorie jose and dose rate at URIAR and VAN to a level below that vhioh
could produce burns.
PROTECTIV? FIF“TRONIC SHUTTERS
These shutters were inoperative at H hour due to a fire in the
wiring circuit at Ho -4 minutes.
With the grid mechanism fully open,
the shutter still reduces the incitent visible light by about 60 percent,
As a first approximation it {5 estimated that the energy reaching the 9
rabtit eye vas effectively reduced from
2
@ about
au’. is of interest that no lesions vere produced in the animals
behind the protective shutters,
Within the limits imposed by the yiel4
of the weapon and the blink re“lex timo, it would appear that the
“hresnaiy burn production ‘or this event lies veer
Wt BEST AVAILABLE COPY
Ny
COM“ LUS IONS
The blink reflex time for animals ani man ie not suffloientiy
(
rapid to protect against the flash from an atomic detonation —
9
sw
7
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