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Neutron Probe (Advantages (Rapid changes of moisture level can be detected…
Neutron Probe
What is Neutron Probe?
An access tube is installed in the ground, usually made of either Aluminium or Steel, and the source tube is lowered into the tube to the soil
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During the reaction, alpha particles emitted and produced fast neutrons.
When this neutrons collide with H nuclei present in the soil, they lose much of their energy
After collision, slow neutron will return to probe to estimate the amount of Hydrogen present
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Advantages
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Able to measure large amount of soil, through its large depth range
Soil moisture is estimated in millimeters which is useful in deciding when and how much water to apply
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Disadvantages
Inadequate depth resolution makes measurement of absolute moisture content difficult, especially in layered soils
The probe uses radiation to measure soil moisture and is therefore a potential health hazard to the operator
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Moisture measurement may depend on physical and chemical properties that have proven to be difficult to measure
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