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NOTE:
What follows is the approxirate text that Dr. Gordon
Dunning of the Civision of biology and Medicine, Ata
Energy Commission, will use in his oriefing: lecture #
unclearei Observer Group at Eniwetok on. the “abbye s
a
~
4
Nature and Gis tribution of Falrou, i‘
As the instant of detonation of a nuclear weapor there
is produced a tlast
tion.
The blast ant initicl gamma effects are limited to
eo
The intensity of the light might be hérwful to,
ws
areas relatively ciose in to the atoll where the detonation .%
occurs.
the eyes out to the maximum straight- line-of-sight distance me
if viewed without protective glasses.
>
:a
r
The effect that may result at zreat, distance is
that of radiation exposure from fallout.
At the time of
detonation @ large number of cifferent raaioactive substances are preduced witn half-lives rar-ing from a frace
:
* =
tion of a second te many years (the half-life is the time
Bal tolose one-half of its railoactivity).
gs high in the air these radioisotopes
Bied with fine particles that settle rela=
Meeco the earth thus providing time for the |
eT
“the short-lived isotopes to decoy and also
for rhe wide cdisoersal of the particulate nattar.
when
_« the firebal: intersects the Eg round during & detonation ®
the radioisotcces will become associated principally
wiun the larger »articles wnich fall relatively rapidly,
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