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Figure 1.3: Example of Non-shielded sealed source de-
sign of Cf-252 neutron source.
wich of lead and boron based materials. The hole on
the shielding compartment has a function of collima-
tor. Opening of collimator determine the direction and
intensity of emitted neutron. Focusing neutron to a de-
sired direction is made through the opening of collima-
tor. The direction can be in 360◦, in a cone beam or
in any direction depending on the usage and applica-
tions.
1.5.2 Nuclear Reactor
Produce neutrons from fission process of Uranium-235
in a nuclear fuel is occurred in nuclear reactor for re-
search. Neutron produced from the reactor consist of
a wide ranges of energy. Initially, fast neutron with the
energy about MeV range is produced after fission and
eventually slow down to thermal neutron at about eV
energy ranges. Typical side view of cross sectional
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