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Related Concept Videos

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The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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Nuclear chemistry is the study of reactions that involve changes in nuclear structure. The nucleus of an atom is composed of protons and, except for hydrogen, neutrons. The number of protons in the nucleus is called the atomic number (Z) of the element, and the sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are isotopes of the same element.
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Many heavier elements with smaller binding energies per nucleon can decompose into more stable elements that have intermediate mass numbers and larger binding energies per nucleon—that is, mass numbers and binding energies per nucleon that are closer to the “peak” of the binding energy graph near 56. Sometimes neutrons are also produced. This decomposition of a large nucleus into smaller pieces is called fission. The breaking is rather random with the formation of a large...
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The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
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Modeling background radiation in Southern Nevada.

Daniel A Haber1, Pamela C Burnley2, Christopher T Adcock2

  • 1University of Nevada Las Vegas, Geoscience Department, 4505 S Maryland Parkway, Las Vegas, NV, 89154, United States; National Security Technologies, Aerial Measuring Systems, Remote Sensing Laboratory, PO Box 98521, Las Vegas, NV, 89193, United States.

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This study develops a method to predict radiation exposure rates using geology and aerial surveys. This helps map background radiation in unknown environments, crucial for emergency response.

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Area of Science:

  • Geoscience
  • Radiological Science
  • Environmental Monitoring

Background:

  • Aerial gamma ray surveys are vital for identifying radioactive sources.
  • Understanding the link between radioactivity and geology aids in geological prediction.
  • Existing methods lack high-resolution background radiation models for unknown environments.

Purpose of the Study:

  • To develop a high-resolution background model for predicting radiologic exposure rates.
  • To create a method applicable to emergency response scenarios with unknown radiation.
  • To refine prediction techniques using detailed aerial survey data.

Main Methods:

  • Integration of geologic data, ASTER imagery, geochemical data, and NURE surveys.
  • Definition of homogenous background radiation units based on K, U, and Th concentrations.
  • Geospatial modeling and comparison with detailed aerial survey data for refinement.

Main Results:

  • Successful high-resolution background radiation models were produced for two Southern Nevada study areas.
  • Geologic units and ASTER visualizations were effectively used to define background radiation units.
  • The developed method allows for accurate prediction of gamma ray exposure rates.

Conclusions:

  • The developed method accurately predicts background radiation levels using integrated geospatial and radiometric data.
  • This technique enhances emergency preparedness by providing crucial radiation environment information.
  • The study demonstrates the utility of combining diverse datasets for detailed radiological mapping.