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by heating and left the dry soil only. However, this
method is time consuming and does not considered as
in-situ approach. Alternatively, details engineering ap-
proach had been done to utilise neutron sealed source
in the measurement of moisture in the soil, especially
for road construction application [?].
Figure 2.9: Typical layout of neutron moisture gauge
and the principle of neutron back scattered technique.
The humidity through out the depth below the sur-
face can be measured using this gauge.Typical neu-
tron source used in this gauge is Americium-241/Berylium
and detector He3 is used. The result from measure-
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