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Related Concept Videos

Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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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...
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.

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Emission Spectroscopic Boundary Layer Investigation during Ablative Material Testing in Plasmatron
09:41

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Beam range estimation by measuring bremsstrahlung.

Mitsutaka Yamaguchi1, Kota Torikai, Naoki Kawachi

  • 1Takasaki Advanced Radiation Research Institute, Japan Atomic Energy Agency-JAEA, 1233 Watanuki-machi, Takasaki, Gunma 370-1292, Japan. yamaguchi.mitsutaka@jaea.go.jp

Physics in Medicine and Biology
|April 20, 2012
PubMed
Summary

This study introduces a novel method for determining heavy-ion radiation therapy beam range using ion beam bremsstrahlung measurements. The technique accurately estimates the range by analyzing the bremsstrahlung spectrum, confirming its effectiveness in clinical applications.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Nuclear Physics

Background:

  • Accurate determination of the beam range is critical in heavy-ion radiation therapy for precise dose delivery.
  • Existing methods for range estimation may have limitations in accuracy or efficiency.

Purpose of the Study:

  • To develop and validate a new method for estimating the ion beam range in heavy-ion radiation therapy.
  • To investigate the contribution of secondary electron bremsstrahlung to the overall bremsstrahlung spectrum.

Main Methods:

  • Experimental measurement of ion beam bremsstrahlung.
  • Analysis of the bremsstrahlung spectrum, focusing on the 63-68 keV energy region.
  • Monte Carlo simulation to assess background photon contributions.

Main Results:

  • Experimental confirmation that secondary electron bremsstrahlung is the dominant process.
  • Monte Carlo simulations indicate background photons from annihilation gamma rays are minimal (~1%).
  • Strong agreement between experimental data and theoretical predictions for the bremsstrahlung spectrum shape.

Conclusions:

  • The novel method effectively estimates the ion beam range in heavy-ion radiation therapy.
  • The secondary electron bremsstrahlung process is a reliable indicator for range estimation.
  • The validated method holds promise for improving precision in radiation oncology.