الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
It is essential in studying the transport of fast neutrons through certain media to take into consideration the effect of secondary radiations produced in the medium as a result of the different types of interactions of neutrons. The most important of these is the gamma-radiations, mainly produced by- the_ (n, ’Y ), (n,n’’Y),
(n,p ’y ) , (n, -y a ) ... interactions. These’gamma-radiations(n,p ’y ) , (n, -y a ) ... interactions. These’gamma-radiations(n,p ’y ) , (n, -y a ) ... interactions. These’gamma-radiations(n,p ’y ) , (n, -y a ) ... interactions. These’gamma-radiationswill have a large influence in different fields concerning fission reactor-shields, fusion devices, radiation protec¬tion, industrial process analysis, neutron dosimetry, neutron diagnostics and neutron therapy. Ignorance or
inaccurate determination of these secondary radiations may lead to a significant discrepancies between the calculated
physical functions and their actual values.
Most of radiation tramsport calculational methods adopted in nuclear radiations calculations, handle one type of radiations, either neutrons or gammas, at a time. The mathematical model that treats the simultaneous transport of different types of radiation particles has proved to be very difficult because of the vast amount of the needed input nuclear (fata expressed in the form of differential, cross sections and the complexity of the
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