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Figure 3.5: Decay scheme of gold-198 after gone
through neutron-captured nuclear reaction of gold-197
with thermal neutron

Each element contains in the sample will be activated
and producing primary and secondary ioning radia-
tion. Since inside reactor core is very vast environ-
ment which could cause some damage and integriti
of the sample is reduced. Some types of sample may
change evaporate or melted when exposed to the gamma
or neutron radiation. So that, the sample is placed in
the standard capsule or vile before putting into the re-
actor core for irradiation. Figure 3.6 shows the alu-
minum and plastic capsule used in long and short irra-

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