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TEEORY AND ANALYSIS
RLL.L
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.
lntroduction
Ic is the purpose of this section to compare experizental dita on gasma-
ray intersiry versus tine with a calculational andel of fission-procuct attenuation amd rime decay.
Table 4.1 outlines che principal variables which enter
the model and gives the sources of data on the variables.
TABLE &.1--VARLASLES AND DATA SOURCES
Variabies
Assucptioas
Spatial distribution of gaomaray activity
Point source with a rate of
rise approximately that
observe!
Energy distribution of fissionproduct gamma rays
.
Motz Water Boiler Spectnn,
Phys. Rev., 85, 753 (1952),
and 14-1620) Fig. 5.3, p. 87
Attenuation and buildup of
photons of various energy
1a-16z0, | Fiz. 7.10, p. 117
Tise dependence of fission-
La-1620,? Fiz. 5.2, p.
product gamma-radiation source
Oo the left are the quantities which we oust know to solve the problea.
the right are assucpcions regarding the oature of the variables.
On
LA-120
provides the basis for these assumptions, but aodifications have been asde
and are discussed in chis chapter.
An adjustment was sade in the attenuation and buildug curves of LA-1E£20.
Thac an adjustoent was necessary was observed and pointede cut 5. J. Mare of
RAND Corporation and is based on considerations of the conversion between
photon builtup and enerzy builzza.
Tabl2 4.2 shows che results.
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