الفهرس 
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Abstract
Since the discovery of the x-rays and the nuclear
radiations, a serious problem has been borne; that is, the
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shielding against the strong penetrating radiation which has
harmful biological effects. with the invention of stationary
and mobile nuclear reactors and the development of nuclear
power devices, the need increased for studying the propagation
of neutrons, which are known to be the most hazardous
radiations,in different structures. This study enables us,
essentially, to know more about shielding problems. Besides,
there are some applications that use neutrons, such as, in
medicine and in exploring the different structures of matter
specially in mining and geological investigations.
Measurement of the neutron differential flux at different
locations in substance is one of the best ways for accounting
for the neutron penetration. Though accuracy of the
experimental measurements are still somewhat high, yet the
theoretical calculations are diversified.
The present work gives statistical calculations based on
simple solid geometry of the neutron scattering processes
arising from a finite homogeneous mono-energetic circular beam
falling normally on an infinite plane slab of material at any
point within. Effects of inelastic scattering were also taken
into consideration for special cases.