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Related Concept Videos

Phase Diagram01:19

Phase Diagram

The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
Phase Diagrams02:39

Phase Diagrams

A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle01:19

Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle

Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...

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Scalable Nanohelices for Predictive Studies and Enhanced 3D Visualization
08:03

Scalable Nanohelices for Predictive Studies and Enhanced 3D Visualization

Published on: November 12, 2014

An implementation to read and write IAEA phase-space files in GEANT4-based simulations.

Miguel Antonio Cortés-Giraldo1, José Manuel Quesada, María Isabel Gallardo

  • 1Department of Atomic, Molecular and Nuclear Physics, University of Seville, Seville, Spain. miancortes@us.es

International Journal of Radiation Biology
|October 1, 2011
PubMed
Summary

A new C++ code enables GEANT4 applications to read and write IAEA-standard phase-space files. This facilitates seamless data exchange between GEANT4 and other Monte Carlo codes for dosimetry studies.

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Area of Science:

  • Medical Physics
  • Computational Physics
  • Radiation Dosimetry

Background:

  • GEANT4 (GEometry ANd Tracking) is a widely used toolkit for simulating particle transport.
  • Phase-space (phsp) files store detailed information about particle histories.
  • Interoperability between different Monte Carlo (MC) codes is crucial for validating results and sharing data.

Purpose of the Study:

  • To develop a standalone C++ code for GEANT4.
  • To enable GEANT4 applications to read and write International Atomic Energy Agency (IAEA) phase-space (phsp) files.
  • To facilitate the exchange of phsp files between GEANT4 and other validated MC codes.

Main Methods:

  • Developed a C++ object-oriented, standalone code for GEANT4.
  • Implemented a reader module to import IAEA phsp files and create primary particles in GEANT4.
  • Implemented a writer module to generate IAEA phsp files during GEANT4 simulations.
  • Ensured compatibility with future IAEA phsp format versions.

Main Results:

  • A testing simulation in GEANT4 demonstrated satisfactory code performance.
  • An example application simulating a radiotherapy linear electron accelerator (linac) treatment head was presented.
  • Dose calculations from the linac simulation were successfully compared with experimental data.

Conclusions:

  • The standalone package enhances GEANT4 applications by enabling validated phsp file exchange.
  • This facilitates the use of phsp data from diverse accelerators and fields in dosimetry research.
  • The code offers additional utilities valuable for medical physics applications.