
Concept explainers
BIO Magnetic induction tomography (MIT) Magnetic induction tomography is an imaging method used in mineral, natural gas, oil, and groundwater exploration, as an archaeological tool; and for medical imaging MIT has also been used to measure topsoil depth in agricultural soils. Topsoil depth is information that many farmers need for instance, corn yield is much higher in soil that has a deep topsoil layer above the underlying, impermeable claypan. Using a trailer attached to a tractor, a farmer can map an
(about 20-acre) field for topsoil depth in about 1 hour.
Figure 21.28 shows how MIT works A time-varying
Why is MIT used to search for mineral deposits (iron, copper, zinc)?
a. The minerals are good conductors of electricity and produce strong induced currents and strong returning magnetic fields.
b. The minerals absorb the incident magnetic field, indicating their presence by a lack of returning signal.
c. The minerals produce their own returning magnetic fields.
d. The minerals attract the incoming magnetic field and reflect it directly above the minerals.

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