GameRadizton. For a fission-type device the
initial rediations are divided approximately es shown in Table 1.1
(from Reference 5). The major contribution to initial gums rediation
is from the fission-product gammas and the garam rediation from neutron
capture by i (ny y) in the HE components and air. The proupt games
are nearly a)) absorbed in the device itself and are of little significance outside of the device.
The fisslon=-product gemmas predominate at
close distances (Reforence 5). The ni4 (n, ~) ganmmas become relatively more
imocrtant et greater distances, and evortually become the mejor contributor.
This apcifies only te devices with ylelds of less than 100 kt, in which
ti.e hydrodynamic effect 4s emall.
Figure 1.1 shows the contribution from
fission~product ganmas and x (n, y) for a 1-kt surface burst. witirt
respect tc tine, the n* (n, ¥) rediation 4s essentially emitted within
Ge setonds the fisston=rrcduct gavmms, however, continuc tc conmtributc
for the first 30 seconds.
~-
TABLE 1,1
ENCRGY PARTITION IN FISSION
(reference 5)
Mechanism
Kinetic Energy of
Fission Pregquents
Promret Ne
Percent cf Totel
Fission Energy
percent
st
4
Prompt Gcmnes
4
Fission Product Gemos
Eel
Fission Product Betcs
267
Fission Product Neutrincss
56°
DeloveNewirons
Toteie
fetal Energy
per Fission
Sr. Louis MM
1&
&
&
5A
5A
14
fe”
Lg?
o,f
Fu at
Syostly ebeorbed in the device.
ee SS
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