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Related Concept Videos

Nuclear Binding Energy02:13

Nuclear Binding Energy

The difference between the calculated and experimentally measured masses is known as the mass defect of the atom. In the case of helium-4, the mass defect indicates a “loss” in mass of 4.0331 amu – 4.0026 amu = 0.0305 amu. The loss in mass accompanying the formation of an atom from protons, neutrons, and electrons is due to the conversion of that mass into energy that is evolved as the atom forms. The nuclear binding energy is the energy produced when the atoms’ nucleons are bound together;...
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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 number of different...
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Updated: May 25, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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Nuclear event zero-time calculation and uncertainty evaluation.

Pujing Pan1, R Kurt Ungar

  • 1Environmental Compliance and Laboratory Services Division, Canadian Nuclear Safety Commission, 3484 Limebank Road, Ottawa, Ontario, Canada K1V 1E1. Pujing.Pan@cnsc-ccsn.gc.ca

Journal of Environmental Radioactivity
|February 7, 2012
PubMed
Summary

Determining the zero-time of nuclear events, like tests or accidents, is crucial for origin localization. This study presents analytical equations for calculating zero-time and its uncertainty using nuclide activity ratios.

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Area of Science:

  • Nuclear Physics
  • Radiochemistry
  • Environmental Monitoring

Background:

  • Accurate determination of nuclear event zero-time is vital for source localization and forensic analysis.
  • Existing methods may lack sufficient precision or comprehensive uncertainty quantification.
  • Nuclear events include weapon tests, power plant accidents, and improvised nuclear devices (INDs).

Purpose of the Study:

  • To derive analytical equations for calculating the zero-time of nuclear events.
  • To develop methods for quantifying the uncertainty associated with zero-time calculations.
  • To validate the derived equations using real-world data.

Main Methods:

  • Utilizing measured activity ratios of two specific nuclides.
  • Deriving analytical equations for zero-time estimation.
  • Calculating associated uncertainty terms based on measurement data.

Main Results:

  • Successful derivation of analytical equations for zero-time determination.
  • Quantification of uncertainty in zero-time calculations.
  • Demonstration of the method's applicability using data from a 1980 Chinese thermonuclear test.

Conclusions:

  • The derived analytical equations provide a robust method for calculating nuclear event zero-time.
  • Accurate uncertainty assessment is integral to complete zero-time determination.
  • The method is validated and applicable for nuclear event analysis and forensic investigations.