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diation times respectively.

Figure 3.6: Decay scheme of gold-198 after gone
through neutron-captured nuclear reaction of gold-197
with thermal neutron

Aluminum is used for making a capsule or NAA
sample vile because half-life of its radionuclide is short.
In fact, every 20 minutes the dose will reduce half. An-
other good affect from aluminum is that transparent
to thermal neutron because neutron cross-section is
small so that irradiation become more efficient.Alternatively,
irradiation for short exposure sample, the vile made by
plastic (PET) is used. The plastic in the vast environ-
ment is not so strong when compared to the aluminum,
The plastic become distorted and melted if exposed to

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