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Related Concept Videos

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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Nuclear Stability03:18

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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
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Controlled nuclear fission reactions are used to generate electricity. Any nuclear reactor that produces power via the fission of uranium or plutonium by bombardment with neutrons has six components: nuclear fuel consisting of fissionable material, a nuclear moderator, a neutron source, control rods, reactor coolant, and a shield and containment system.
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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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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...
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The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
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Updated: Sep 20, 2025

High-Resolution Neutron Spectroscopy to Study Picosecond-Nanosecond Dynamics of Proteins and Hydration Water
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Unidimensional neutron shielding model for VARSKIN.

Zane Tucker1, Charlotte Rose1

  • 1Renaissance Code Development, LLC, 310 NW 5th St. Ste. 203, Corvallis, OR 97330, United States.

Radiation Protection Dosimetry
|May 25, 2025
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Summary

A new neutron shielding model for VARSKIN+ software offers rapid dose calculations for materials like water and polyethylene. While less precise than Monte Carlo methods, it provides a valuable, quick estimate for initial neutron shielding studies.

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Area of Science:

  • Nuclear Engineering
  • Radiation Shielding Physics
  • Computational Dosimetry

Background:

  • Accurate neutron dose assessment is crucial for radiation safety.
  • Existing computational tools can be time-consuming for complex shielding scenarios.
  • A need exists for efficient neutron shielding models in radiation transport codes.

Purpose of the Study:

  • To develop and validate a simplified one-dimensional neutron shielding model.
  • To integrate this model into the VARSKIN+ multipurpose dose calculation code.
  • To enable faster estimation of neutron doses through various shielding materials.

Main Methods:

  • Development of a one-dimensional neutron transport model accounting for energy loss.
  • Validation using Monte Carlo simulations for energy response comparison.
  • Comparison with empirical dose response data for water and paraffin shielding.

Main Results:

  • The developed model, integrated into VARSKIN+, calculates neutron doses significantly faster than Monte Carlo methods.
  • Dose calculations using VARSKIN+ showed agreement within 20%-100% compared to rigorous Monte Carlo results.
  • The model demonstrated flexibility for incorporating additional shielding materials beyond water and polyethylene.

Conclusions:

  • The simplified neutron shielding model provides a computationally efficient tool for initial dose assessments.
  • VARSKIN+ with the new model serves as a practical starting point for neutron shielding investigations.
  • The model's speed and adaptability make it valuable for preliminary studies before employing more intensive simulations.