more adequate
infctriation that burning is due to energy in
the infra-red and visible portions of tne: spectrum with ne
Significant contributictn from the ultraviolet.
aAbour ines
half of the thermai injury is caused ty wae infra=reéu rays
the remainder being attributabie to raliation in the
visible rarge.
Burns produced ty a fission bome differ in no
respect from those due to any high intensity heat of short
duration.
As far as the thermai injury itself is concerned,
the treatment presents the same probiems as do similar
injuries from other heat sources.
With respect to the time intervai of the thermal
radiation emission during which burns may be produced, for
yields which are relatively smail muirtivies of the nominal
bomb, it has been found that:
ae
There is no burning in the first 0.925 second
following detonation.
bt.
The major severity of thermai burns is attained within the first 0.3 second after ietonation.
ce
No burns are produced after 0.€ second if the
skin is protected prior to that time.
d.
There is good relationship between the measured
thermal energy and that determined by evaluating the skin
burns from laboratory standards during the first 0.3 second.
e.
No difference in severity between smail and
large area burns occurs when otner conditions are equal.
f.
In animals, moderate burns have been found te
heal at normal rates despite the development of irradiation
sickness.
Sor the nominal bom»), che time from dstoretion to
the second méximum of fireball illuminatior is approximately
200 millisezords (0.2 second).
With larger yields, this
t +
iw
wae
o
a
~~
duration of the thermal pulse increases and may be as
great as several seconds for very large yields.