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such as alpha and beta. Therefore, shielding of neu-
tron should be incorporated with other materials which
can shield gamma radiation, alpha and beta particles.
The capability of certain material to block neutron is
illustrated in Figure 1.8
Figure 1.8: Neutron shielding.
The best materials for shielding neutrons must be
able to slow down neutrons as discuss above it has a
same principle with the neutron moderation. First point
to fulfill only by hydrogenous material containing light
atoms such as water, polyethylene, and concrete. The
nucleus of a hydrogen nucleus contains only a pro-
ton. Since a proton and a neutron have almost iden-
tical masses, a neutron scattering on a hydrogen nu-
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