The efficiency
of the concrete used as a biological shield is largely dependent
on the amount of heat released due to the attenuation and absorption
of neutrons and gamma rays in the shield. Various theoretical
and experimental investigations have been carried out to study the
attenuation and distribution of gamma rays and fast neutrons in
different shielding materials (Little, 1963; Bashter et al., 1996;
Makarious et al., 1991; Gencel et al., 2010a).