  It is very important to measure the plasma performances of fusion reactors
such as fuel ion density, plasma temperature, fusion power, fast neutron
energy, and neutron flux. Various diagnostic systems are needed to measure fast
neutron properties in fusion plasmas. Generally, various types of neutron
cameras and monitors are used. These systems are sensitive to neutron as well
as gamma-ray radiation. Therefore, monitor systems that distinguish between
neutron and gamma rays should be used. In this study, the NE-213 liquid
scintillation detector was selected, and Pulse Shape Discriminator (PSD) NIM
unit was used for the neutron/gamma-ray discrimination. True spectrum was found
by unfolding the spectrum obtained by the reaction of neutrons to the protons
in the detector with the FERD-PC computer code. In this study, the energy
spectrum of fast neutrons produced in a neutron generator was measured by the
unfolding method.
