Page 65 - bukuneutron

Figure 3.1: NAA [?]

cleus is formed in an excited state upon a non-elastic
collision of a neutron with the nucleus. The excita-
tion energy of compound nucleus is resulting from the
binding energy of the neutron with the nucleus. In
order to be more stable configuration, the compound
nucleus decays and emit one or more characteristic
prompt gamma rays instantaneously. Sequentially, the
more stable compound with radioactive nucleus cre-
ated which also decays by emitting one of more char-
acteristic delayed gamma radiations. At this stage, the
gamma emission rate is slower according to the spe-
cific and unique half-life of the radioactive nucleus of
radionuclides.

Half-life of radionuclides can ranges from a second
to several years depending on the type of particular ra-
dioactive. As mentioned above, Due to this time scale,
the determination of gamma emitting radionuclides by

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