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Related Concept Videos

Magnetic Damping01:17

Magnetic Damping

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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
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Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the...
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Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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A Passive Magnetoelastic Radiation Sensor.

Vincent Lamberti1, David Mee1, Peter Angelo1

  • 1Consolidated Nuclear Security, LLC, Y-12 National Security Complex, P.O. Box 2009, Oak Ridge, TN 37831, USA.

Sensors (Basel, Switzerland)
|November 20, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a passive gamma detection technology using a small, unpowered sensor. The sensor measures cumulative radiation dose by detecting changes in a magnetoelastic wire

Keywords:
magnetoelastic sensorpassive radiation sensorsensor arraywireless

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Area of Science:

  • Nuclear physics
  • Materials science
  • Sensor technology

Background:

  • Passive radiation detection is crucial for monitoring environments where active systems are impractical.
  • Existing methods often require power or direct data connections, limiting deployment flexibility.
  • A need exists for robust, self-contained radiation sensors with wireless data capabilities.

Purpose of the Study:

  • To describe a novel passive gamma detection technology.
  • To detail the sensor's design, operation, and performance characteristics.
  • To evaluate the sensor's response linearity and wireless communication range.

Main Methods:

  • A passive sensor utilizing an amorphous magnetoelastic wire under stress from a radiation-sensitive material.
  • Gamma radiation degrades the material, reducing stress and magnetic permeability.
  • Changes in Faraday voltage are measured wirelessly via an excitation-detection coil set.

Main Results:

  • The sensor is a small cylinder (2.5mm x 15mm) requiring no onboard power or connections.
  • Wireless communication is achieved up to 25mm through various barriers.
  • Sensor response demonstrated linearity up to a dose of at least 7 kGy.

Conclusions:

  • The developed passive gamma detection technology offers a self-contained, deployable solution.
  • Its wireless capability and linear response up to 7 kGy are significant advantages.
  • This technology has potential applications in environments requiring long-term, unattended radiation monitoring.