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The sphere of influence of neutron moisture meter for dry is
EXPLANATION
Soil Water Dynamics
- Sphere of Influence of Neutron Moisture Meter:
- The radioactive americium-beryllium ($Am-Be$) probe emits high-energy fast neutrons that thermalize upon colliding with hydrogen nuclei of water molecules.
- In wet soils (high hydrogen density), thermalization occurs rapidly within a compact sphere of radius $\approx 0.15\text{ m}$.
- In dry soils (low hydrogen concentration), fast neutrons must travel much farther before colliding with water molecules, expanding the effective sampling radius to approximately 0.25 m (up to $0.30 - 0.50\text{ m}$). (Correct answer: Option 3)
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