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Related Concept Videos

Biological Effects of Radiation02:59

Biological Effects of Radiation

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 produce ions...
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Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic and are commonly found near the...
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Radiation: Applications

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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The correlation between a drug's dosage and its impact on a biological system is a cornerstone of pharmacology and toxicology. Conventional dose–response curves, which include graded and quantal relationships, are key to this understanding. Graded dose–response curves depict the spectrum of a biological reaction to different doses within an individual, indicating that as the drug dosage increases, so does the intensity of the response. On the other hand, quantal dose–response relationships...
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Radiation Pressure: Problem Solving

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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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
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Radiation dose descriptors: BERT, COD, DAP, and other strange creatures.

Edward L Nickoloff1, Zheng Feng Lu, Ajoy K Dutta

  • 1Department of Radiology, Columbia University, MHB 3-265B, 177 Fort Washington Ave, New York, NY 10032, USA. eln1@columbia.edu

Radiographics : a Review Publication of the Radiological Society of North America, Inc
|September 17, 2008
PubMed
Summary

Understanding radiation dose descriptors is crucial for accurate risk assessment. Key terms like effective dose (ED) and background equivalent radiation time (BERT) help evaluate potential biologic effects and patient concerns.

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Area of Science:

  • Medical Physics
  • Radiology
  • Radiation Protection

Background:

  • Various terms describe radiation dose, leading to potential confusion.
  • Accurate dose assessment is vital for patient safety and risk communication.
  • Eight common radiation dose descriptors exist, each with specific applications.

Purpose of the Study:

  • To clarify and differentiate eight common radiation dose descriptors.
  • To explain the derivation and application of each descriptor.
  • To emphasize the importance of understanding these terms for accurate radiation dose evaluation and patient consultation.

Main Methods:

  • Review and definition of eight radiation dose descriptors: background equivalent radiation time (BERT), critical organ dose (COD), surface absorbed dose (SAD), dose area product (DAP), diagnostic acceptable reference level (DARLing), effective dose (ED), fetal absorbed dose (FAD), and total imparted energy (TIE).
  • Explanation of the calculation or basis for each descriptor.
  • Highlighting the intended use and significance of each descriptor in relation to potential biologic effects.

Main Results:

  • BERT provides a public-friendly comparison to natural background radiation.
  • COD, SAD, DAP, FAD, and TIE quantify dose to specific organs, surfaces, areas, fetuses, or total energy imparted.
  • DARLing serves as a voluntary guidance level for diagnostic reference.
  • Effective dose (ED) is the most comprehensive descriptor for assessing overall radiation risk, including cancer and hereditary effects.

Conclusions:

  • Each radiation dose descriptor serves a distinct purpose in evaluating radiation exposure and potential biologic effects.
  • Effective dose (ED) is the most useful descriptor for comprehensive risk assessment.
  • Avoiding interchangeable use of these terms is essential for clarity in radiation dose evaluation and patient communication.